GB/T 18115.2-2020Chemical analysis methods of rare earth impurities in rare earth metals and their oxides—Part 2: Determination of lanthanum, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and yt (English PDF)
稀土金属及其氧化物中稀土杂质化学分析方法 第2部分：铈中镧、镨、钕、钐、铕、钆、铽、镝、钬、铒、铥、镱、镥和钇量的测定
This is a limited preview
Buy now to download the full PDF (38 pages)
Need quotation for your management?
Get a formal quotation for GB/T 18115.2-2020 in 30 minutes.
Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
November 19, 2020
Implementation date
October 1, 2021
Scope
GB/T 18115.2-2020 is the English-translated version of 稀土金属及其氧化物中稀土杂质化学分析方法 第2部分：铈中镧、镨、钕、钐、铕、钆、铽、镝、钬、铒、铥、镱、镥和钇量的测定.
GB/T 18115.2-2020 is the part of the Chinese series on the chemical analysis of rare earth impurities in rare earth metals and their oxides that covers cerium and cerium oxide.
It gives three methods for determining the lanthanum, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and yttrium oxides present as impurities - inductively coupled plasma optical emission spectrometry, inductively coupled plasma mass spectrometry and inductively coupled plasma tandem mass spectrometry - with the quality assurance and control.
It applies to cerium metal and cerium oxide. Rare earth refiners and analytical laboratories use it. Issued on 19 November 2020, it has applied since 1 October 2021, replacing GB/T 18115.2-2006.
Found what you need?
Document preview — GB/T 18115.2-2020
National Standard of the People's Republic of China
- ICS
- 77.120.99
- Classification
- H 14
- Replacing
- GB/T 18115.2-2006
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword3
- 1 Scope7
- 2 Method 1: Inductively Coupled Plasma Optical Emission Spectrometry9
- 3 Method 2: Inductively Coupled Plasma Mass Spectrometry17
- 4 Method 3: Inductively Coupled Plasma Tandem Mass Spectrometry29
- 5 Quality Assurance and Control37
- Appendix A (normative) Conditional Test Operation of C272 Micro-column Separation Eluent Collection Time38
1 Scope
This Part of GB/T 18115 stipulates the determination method for the contents of lanthanum oxide, praseodymium oxide, neodymium oxide, samarium oxide, europium oxide, gadolinium oxide, terbium oxide, dysprosium oxide, holmium oxide, erbium oxide, thulium oxide, ytterbium oxide, lutetium oxide and yttrium oxide in cerium oxide.
This Part is applicable to the determination of the contents of lanthanum oxide, praseodymium oxide, neodymium oxide, samarium oxide, europium oxide, gadolinium oxide, terbium oxide, dysprosium oxide, holmium oxide, erbium oxide, thulium oxide, ytterbium oxide, lutetium oxide and yttrium oxide in cerium oxide.
This Part also applies to the determination of the contents of lanthanum, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and yttrium in cerium metal.
This Part includes a total of three methods: Method 1 - inductively coupled plasma atomic emission spectrometry, Method 2 - inductively coupled plasma mass spectrometry, and Method 3 - inductively coupled plasma tandem mass spectrometry. The determination range of Method 1 is shown in Table 1, the determination range of Method 2 is shown in Table 2, and the determination range of Method 3 is shown in Table 3. […]
2 Method 1: Inductively Coupled Plasma Optical Emission Spectrometry
2.2.6 Standard stock solution of praseodymium oxide: weigh-take 0.1000 g of praseodymium oxide [w (Pr6O11/REO) >= 99.999%, w (REO) >= 99.5%] that has been burned at 950 °C for 1 hour, place it in a 100 mL beaker, add 10 mL of hydrochloric acid (2.2.2); heat to dissolve it at a low temperature, then, cool to room temperature; transfer the solution into a 100 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 1 mg of praseodymium oxide.
2.2.7 Standard stock solution of neodymium oxide: weigh-take 0.1000 g of neodymium oxide [w (Nd2O3/REO) >= 99.999%, w (REO) >= 99.5%] that has been burned at 950 °C for 1 hour, place it in a 100 mL beaker, add 10 mL of hydrochloric acid (2.2.2); heat to dissolve it at a low temperature, then, cool to room temperature; transfer the solution into a 100 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 1 mg of neodymium oxide.
2.2.8 Standard stock solution of samarium oxide: weigh-take 0.1000 g of samarium oxide [w (Sm2O3/REO) >= 99.999%, w (REO) >= 99.5%] that has been burned at 950 °C for 1 hour, place it in a 100 mL beaker, add 10 mL of hydrochloric acid (2.2.2); heat to dissolve it at a low temperature, then, cool to room temperature; transfer the solution into a 100 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 1 mg of samarium oxide.
2.2.9 Standard stock solution of europium oxide: weigh-take 0.1000 g of europium oxide [w (Eu2O3/REO) >= 99.999%, w (REO) >= 99.5%] that has been burned at 950 °C for 1 hour, place it in a 100 mL beaker, add 10 mL of hydrochloric acid (2.2.2); heat to dissolve it at a low temperature, then, cool to room temperature; transfer the solution into a 100 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 1 mg of europium oxide.
2.2.10 Standard stock solution of gadolinium oxide: weigh-take 0.1000 g of gadolinium oxide [w (Gd2O3/REO) >= 99.999%, w (REO) >= 99.5%] that has been burned at 950 °C for 1 hour, place it in a 100 mL beaker, add 10 mL of hydrochloric acid (2.2.2); heat to dissolve it at a low temperature, then, cool to room temperature; transfer the solution into a 100 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 1 mg of gadolinium oxide.
2.2.11 Standard stock solution of terbium oxide: weigh-take 0.1000 g of terbium oxide [w (Tb4O7/REO) >= 99.999%, w (REO) >= 99.5%] that has been burned at 950 °C for 1 hour, place it in a 100 mL beaker, add 10 mL of nitric acid (2.2.3), add 10 mL of hydrogen peroxide (2.2.1); heat to dissolve it at a low temperature, then, cool to room temperature; transfer the solution into a 100 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 1 mg of terbium oxide.
2.2.12 Standard stock solution of dysprosium oxide: weigh-take 0.1000 g of dysprosium oxide [w (Dy2O3/REO) >= 99.999%, w (REO) >= 99.5%] that has been burned at 950 °C for 1 hour, place it in a 100 mL beaker, add 10 mL of hydrochloric acid (2.2.2); heat to dissolve it at a low temperature, then, cool to room temperature; transfer the solution into a 100 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 1 mg of dysprosium oxide.
2.2.13 Standard stock solution of holmium oxide: weigh-take 0.1000 g of holmium oxide [w (Ho2O3/REO) >= 99.999%, w (REO) >= 99.5%] that has been burned at 950 °C for 1 hour, place it in a 100 mL beaker, add 10 mL of hydrochloric acid (2.2.2); heat to dissolve it at a low temperature, then, cool to room temperature; transfer the solution into a 100 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 1 mg of holmium oxide.
2.2.14 Standard stock solution of erbium oxide: weigh-take 0.1000 g of erbium oxide [w (Er2O3/REO) >= 99.999%, w (REO) >= 99.5%] that has been burned at 950 °C for 1 hour, place it in a 100 mL beaker, add 10 mL of hydrochloric acid (2.2.2); heat to dissolve it at a low temperature, then, cool to room temperature; transfer the solution into a 100 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 1 mg of erbium oxide.
2.2.15 Standard stock solution of thulium oxide: weigh-take 0.1000 g of thulium oxide [w (Tm2O3/REO) >= 99.999%, w (REO) >= 99.5%] that has been burned at 950 °C for 1 hour, place it in a 100 mL beaker, add 10 mL of hydrochloric acid (2.2.2); heat to dissolve it at a low temperature, then, cool to room temperature; transfer the solution into a 100 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 1 mg of thulium oxide.
2.2.16 Standard stock solution of ytterbium oxide: weigh-take 0.1000 g of ytterbium oxide [w (Yb2O3/REO) >= 99.999%, w (REO) >= 99.5%] that has been burned at 950 °C for 1 hour, place it in a 100 mL beaker, add 10 mL of hydrochloric acid (2.2.2); heat to dissolve it at a low temperature, then, cool to room temperature; transfer the solution into a 100 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 1 mg of ytterbium oxide.
2.2.17 Standard stock solution of lutetium oxide: weigh-take 0.1000 g of lutetium oxide [w (Lu2O3/REO) >= 99.999%, w (REO) >= 99.5%] that has been burned at 950 °C for 1 hour, place it in a 100 mL beaker, add 10 mL of hydrochloric acid (2.2.2); heat to dissolve it at a low temperature, then, cool to room temperature; transfer the solution into a 100 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 1 mg of lutetium oxide.
2.2.18 Standard stock solution of yttrium oxide: weigh-take 0.1000 g of yttrium oxide [w (Y2O3/REO) >= 99.999%, w (REO) >= 99.5%] that has been burned at 950 °C for 1 hour, place it in a 100 mL beaker, add 10 mL of hydrochloric acid (2.2.2); heat to dissolve it at a low temperature, then, cool to room temperature; transfer the solution into a 100 mL volumetric […]
3 Method 2: Inductively Coupled Plasma Mass Spectrometry
3.2.19 Standard stock solution of gadolinium oxide: weigh-take 0.1000 g of gadolinium oxide [w (Gd2O3/REO) >= 99.999%, w (REO) >= 99.5%] that has been burned at 950 °C for 1 hour, place it in a 100 mL beaker, add 10 mL of nitric acid (3.2.6); heat at a low temperature, until it completely dissolves, remove it, then, cool to room temperature; transfer it into a 100 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 1 mg of gadolinium oxide.
3.2.20 Standard stock solution of terbium oxide: weigh-take 0.1000 g of terbium oxide [w (Tb4O7/REO) >= 99.999%, w (REO) >= 99.5%] that has been burned at 950 °C for 1 hour, place it in a 100 mL beaker, add 10 mL of nitric acid (3.2.6), add 2 mL of hydrogen peroxide (3.2.3); heat at a low temperature, until it completely dissolves, remove it, then, cool to room temperature; transfer it into a 100 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 1 mg of terbium oxide.
3.2.21 Standard stock solution of dysprosium oxide: weigh-take 0.1000 g of dysprosium oxide [w (Dy2O3/REO) >= 99.999%, w (REO) >= 99.5%] that has been burned at 950 °C for 1 hour, place it in a 100 mL beaker, add 10 mL of nitric acid (3.2.6); heat at a low temperature, until it completely dissolves, remove it, then, cool to room temperature; transfer it into a 100 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 1 mg of dysprosium oxide.
3.2.22 Standard stock solution of holmium oxide: weigh-take 0.1000 g of holmium oxide [w (Ho2O3/REO) >= 99.999%, w (REO) >= 99.5%] that has been burned at 950 °C for 1 hour, place it in a 100 mL beaker, add 10 mL of nitric acid (3.2.6); heat at a low temperature, until it completely dissolves, remove it, then, cool to room temperature; transfer it into a 100 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 1 mg of holmium oxide.
3.2.23 Standard stock solution of erbium oxide: weigh-take 0.1000 g of erbium oxide [w (Er2O3/REO) >= 99.999%, w (REO) >= 99.5%] that has been burned at 950 °C for 1 hour, place it in a 100 mL beaker, add 10 mL of nitric acid (3.2.6); heat at a low temperature, until it completely dissolves, remove it, then, cool to room temperature; transfer it into a 100 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 1 mg of erbium oxide.
3.2.24 Standard stock solution of thulium oxide: weigh-take 0.1000 g of thulium oxide [w (Tm2O3/REO) >= 99.999%, w (REO) >= 99.5%] that has been burned at 950 °C for 1 hour, place it in a 100 mL beaker, add 10 mL of nitric acid (3.2.6); heat at a low temperature, until it completely dissolves, remove it, then, cool to room temperature; transfer it into a 100 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 1 mg of thulium oxide.
3.2.25 Standard stock solution of ytterbium oxide: weigh-take 0.1000 g of ytterbium oxide [w (Yb2O3/REO) >= 99.999%, w (REO) >= 99.5%] that has been burned at 950 °C for 1 hour, place it in a 100 mL beaker, add 10 mL of nitric acid (3.2.6); heat at a low temperature, until it completely dissolves, remove it, then, cool to room temperature; transfer it into a 100 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 1 mg of ytterbium oxide.
3.2.26 Standard stock solution of lutetium oxide: weigh-take 0.1000 g of lutetium oxide [w (Lu2O3/REO) >= 99.999%, w (REO) >= 99.5%] that has been burned at 950 °C for 1 hour, place it in a 100 mL beaker, add 10 mL of nitric acid (3.2.6); heat at a low temperature, until it completely dissolves, remove it, then, cool to room temperature; transfer it into a 100 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 1 mg of lutetium oxide.
3.2.27 Standard stock solution of yttrium oxide: weigh-take 0.1000 g of yttrium oxide [w (Y2O3/REO) >= 99.999%, w (REO) >= 99.5%] that has been burned at 950 °C for 1 hour, place it in a 100 mL beaker, add 10 mL of nitric acid (3.2.6); heat at a low temperature, until it completely dissolves, remove it, then, cool to room temperature; transfer it into a 100 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 1 mg of yttrium oxide.
3.2.28 Mixed rare earth standard solution I: respectively transfer-take 2.00 mL of the standard stock solutions of rare earth oxides (3.2.14 ~ 3.2.27) into the same 100 mL volumetric flask, add 10 mL of nitric acid (3.2.6), use water to dilute to the scale and mix it well. 1 mL of this solution contains 20 µg of each single rare earth oxide. Then, use nitric acid (3.2.6) to dilute this solution into 1 mL of standard solution containing 1 µg of each single rare earth oxide.
3.2.29 Mixed rare earth standard solution II: transfer-take 10.00 mL of mixed rare earth standard solution I (3.2.28) into a 100 mL volumetric flask, add 10 mL of nitric acid (3.2.6), use water to dilute to the scale and mix it well. 1 mL of this solution contains 100 ng of each single rare earth oxide.
3.2.30 Cesium internal standard solution: weigh-take 0.1270 g of cesium chloride (3.2.2), add 10 mL of water to completely dissolve it, add 10 mL of nitric acid (3.2.6); transfer it into a 100 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 1 mg of cesium. Then, use nitric acid (3.2.7) to gradually dilute this solution into 1 mL of internal standard solution containing 1 µg of cesium.
3.2.31 Argon [phi (Ar) >= 99.99%]
3.3 Instruments
3.3.2 C272 micro-column separation device.
3.3.1 Inductively coupled plasma mass spectrometer
The mass resolution is better than (0.8 ± 0.1) amu.
3.5.4.3.2 Matrix separation
Respectively insert the leacheate pipeline and eluent pipeline into the leacheate (3.2.12) and eluent (3.2.13), and use the leacheate (3.2.12) to equilibrate the separation column for 6 minutes.
Insert the test solution pipeline into the test solution (3.5.4.1), and after the test solution (3.5.4.1) fills the pipeline, switch the rotary valve 1 and accurately collect 1.00 mL of the test solution (3.5.4.1). Switch Valve 1 to the original position, use the leacheate (3.2.12) to drip wash the separation column for 20 minutes, wash out the matrix cerium, and discharge it to the waste liquid. Switch the rotary valve 2, after using the eluent (3.2.13) to elute for 1 minute, switch the rotary valve 3, and continue to use the eluent (3.2.13) to elute for a certain period of time, so as to elute the gadolinium and terbium enriched on the separation column. Collect the separating liquid in a 10 mL or 25 mL colorimetric tube, and switch Valve 3 to the original position. After 10 minutes, switch Valve 2 to its original position. Due to differences in the performance of the separation column, the conditional test operation for the collection time of the C272 micro-column separation eluent shall comply with Appendix A.
3.5.4.3.3 Preparation of test solutions for determination of gadolinium and terbium
In the 10 mL or 25 mL colorimetric tube that collects the separating liquid, add 0.50 mL or 1.25 mL of cesium internal standard solution (3.2.30), use water to dilute to the scale and mix it well.
3.5.4.4 Preparation of analytical test solution for determination after TODGA matrix separation (gadolinium and terbium)
3.5.4.4.1 Preparation of separation column
Use 20 mL of nitric acid (3.2.8) to equilibrate the separation column and reserve it for later use.
3.5.4.4.2 Matrix separation
Place the test portion (3.5.1) in a 50 mL beaker, add 5 mL of water, 5 mL of nitric acid (3.2.6) and 1 mL of hydrogen peroxide (3.2.3); heat it at a low temperature, until it completely dissolves; transfer it to 50 mL volumetric flask, use water to dilute to the scale and mix it well. Accurately transfer-take 5.00 mL of the analytical test solution and add it to the seapration column. Open the valve and use 150 mL ~ 200 mL of nitric acid (3.2.8) to drip wash the separation column (the flow rate is not greater than 0.5 mL/min), so as to separate the matrix cerium. Discharge the leacheate into the waste liquid cup, until the cerium content in the leacheate is less than 1 µg/mL. Then, use 20 mL of hydrochloric acid (3.2.5) to elute it, discharge the eluent into the waste liquid cup, continue to use hydrochloric acid (3.2.5) to elute the element to be determined.
Collect 40 mL of separating liquid in a 50 mL colorimetric tube, add 2.50 mL of cesium internal standard solution (3.2.30), use water to dilute to the scale, mix it well, and reserve it for determination.
3.5.5 Preparation of standard series solutions
4 Method 3: Inductively Coupled Plasma Tandem Mass Spectrometry
4.2.4 Nitric acid (1 + 1), guaranteed reagent.
4.2.5 Nitric acid (1 + 19), guaranteed reagent.
4.2.6 Standard stock solution of lanthanum oxide: weigh-take 0.1000 g of lanthanum oxide [w (La2O3/REO) >= 99.999%, w (REO) >= 99.5%] that has been burned at 950 °C for 1 hour, place it in a 100 mL beaker, add 10 mL of nitric acid (4.2.4); heat at a low temperature, until it completely dissolves, remove and cool it; transfer it into a 100 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 1 mg of lanthanum oxide.
4.2.7 Standard stock solution of praseodymium oxide: weigh-take 0.1000 g of praseodymium oxide [w (Pr6O11/REO) >= 99.999%, w (REO) >= 99.5%] that has been burned at 950 °C for 1 hour, place it in a 100 mL beaker, add 10 mL of nitric acid (4.2.4); heat at a low temperature, until it completely dissolves, remove and cool it; transfer it into a 100 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 1 mg of praseodymium oxide.
4.2.8 Standard stock solution of neodymium oxide: weigh-take 0.1000 g of neodymium oxide [w (Nd2O3/REO) >= 99.999%, w (REO) >= 99.5%] that has been burned at 950 °C for 1 hour, place it in a 100 mL beaker, add 10 mL of nitric acid (4.2.4); heat at a low temperature, until it completely dissolves, remove and cool it; transfer it into a 100 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 1 mg of neodymium oxide.
4.2.9 Standard stock solution of samarium oxide: weigh-take 0.1000 g of samarium oxide [w (Sm2O3/REO) >= 99.999%, w (REO) >= 99.5%] that has been burned at 950 °C for 1 hour, place it in a 100 mL beaker, add 10 mL of nitric acid (4.2.4); heat at a low temperature, until it completely dissolves, remove and cool it; transfer it into a 100 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 1 mg of samarium oxide.
4.2.10 Standard stock solution of europium oxide: weigh-take 0.1000 g of europium oxide [w (Eu2O3/REO) >= 99.999%, w (REO) >= 99.5%] that has been burned at 950 °C for 1 hour, place it in a 100 mL beaker, add 10 mL of nitric acid (4.2.4); heat at a low temperature, until it completely dissolves, remove and cool it; transfer it into a 100 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 1 mg of europium oxide.
4.2.11 Standard stock solution of gadolinium oxide: weigh-take 0.1000 g of gadolinium oxide [w (Gd2O3/REO) >= 99.999%, w (REO) >= 99.5%] that has been burned at 950 °C for 1 hour, place it in a 100 mL beaker, add 10 mL of nitric acid (4.2.4); heat at a low temperature, until it completely dissolves, remove and cool it; transfer it into a 100 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 1 mg of gadolinium oxide.
4.2.12 Standard stock solution of terbium oxide: weigh-take 0.1000 g of terbium oxide [w (Tb4O7/REO) >= 99.999%, w (REO) >= 99.5%] that has been burned at 950 °C for 1 hour, place it in a 100 mL beaker, add 10 mL of nitric acid (4.2.4), add 2 mL of hydrogen peroxide (4.2.3); heat at a low temperature, until it completely dissolves, remove and cool to room temperature; transfer it into a 100 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 1 mg of terbium oxide.
4.2.13 Standard stock solution of dysprosium oxide: weigh-take 0.1000 g of dysprosium oxide [w (Dy2O3/REO) >= 99.999%, w (REO) >= 99.5%] that has been burned at 950 °C for 1 hour, place it in a 100 mL beaker, add 10 mL of nitric acid (4.2.5), add 2 mL of hydrogen peroxide (4.2.3); heat at a low temperature, until it completely dissolves, remove and cool it; transfer it into a 100 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 1 mg of dysprosium oxide.
4.2.14 Standard stock solution of holmium oxide: weigh-take 0.1000 g of holmium oxide [w (Ho2O3/REO) >= 99.999%, w (REO) >= 99.5%] that has been burned at 950 °C for 1 hour, place it in a 100 mL beaker, add 10 mL of nitric acid (4.2.4); heat at a low temperature, until it completely dissolves, remove and cool it; transfer it into a 100 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 1 mg of holmium oxide.
4.2.15 Standard stock solution of erbium oxide: weigh-take 0.1000 g of erbium oxide [w (Er2O3/REO) >= 99.999%, w (REO) >= 99.5%] that has been burned at 950 °C for 1 hour, place it in a 100 mL beaker, add 10 mL of nitric acid (4.2.4); heat at a low temperature, until it completely dissolves, remove and cool it; transfer it into a 100 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 1 mg of erbium oxide.
4.2.16 Standard stock solution of thulium oxide: weigh-take 0.1000 g of thulium oxide [w (Tm2O3/REO) >= 99.999%, w (REO) >= 99.5%] that has been burned at 950 °C for 1 hour, place it in a 100 mL beaker, add 10 mL of nitric acid (4.2.4); heat at a low temperature, until it completely dissolves, remove and cool it; transfer it into a 100 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 1 mg of thulium oxide.
4.2.17 Standard stock solution of ytterbium oxide: weigh-take 0.1000 g of ytterbium oxide [w (Yb2O3/REO) >= 99.999%, w (REO) >= 99.5%] that has been burned at 950 °C for 1 hour, place it in a 100 mL beaker, add 10 mL of nitric acid (4.2.4); heat at a low temperature, until it completely dissolves, remove and cool it; transfer it into a 100 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 1 mg of ytterbium oxide.
4.2.18 Standard stock solution of lutetium oxide: weigh-take 0.1000 g of lutetium oxide [w (Lu2O3/REO) >= 99.999%, w (REO) >= 99.5%] that has been burned at 950 °C for 1 hour, place it in a 100 mL beaker, add 10 mL of nitric acid (4.2.4); heat at a low temperature, until it completely dissolves, remove and cool it; transfer it into a 100 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 1 mg of lutetium oxide.
4.2.19 Standard stock solution of yttrium oxide: weigh-take 0.1000 g of yttrium oxide [w (Y2O3/REO) >= 99.999%, w (REO) >= 99.5%] that has been burned at 950 °C for 1 hour, place it in a 100 mL beaker, add 10 mL of nitric acid (4.2.4); heat at a low temperature, until it completely dissolves, remove and cool it; transfer it into a 100 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 1 mg of yttrium oxide.
4.2.20 Mixed rare earth standard solution I: respectively transfer-take 2.00 mL of the standard stock solutions of rare earth oxides (4.2.6 ~ 4.2.19) into a 100 mL volumetric flask, add 10 mL of nitric acid (4.2.4), use water to dilute to the scale and mix it well. 1 mL of this solution […]
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 38 pages — is available in the English PDF.
Referenced standards
Similar standards
Editions of GB/T 18115.2
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 18115.2-2020 | Chemical analysis methods of rare earth impurities in rare earth metals and their oxides—Part 2: Determination of lanthanum, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and yt | current edition | Current |
| GB/T 18115.2-2006 | Chemical analysis methods of rare earth impurities in rare earth metals and their oxides—Part 2: Determination of lanthanum, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and yt | previous edition | Superseded |
This page sells the current edition, GB/T 18115.2-2020. Earlier editions are listed for reference only.
How to Download GB/T 18115.2-2020
- 1
Add to cart
Click "Download PDF" on this page and choose "Buy this standard". You can add more standards before checkout.
- 2
Checkout
Enter your email and billing details. Payment is processed securely by Stripe (cards or bank transfer). Prefer bank details? Request a quotation (min. order $300).
- 3
Instant delivery (0–9 sec)
Delivery is automatic: within seconds of payment you'll receive an email with a secure download link. The link stays valid for 72 hours.
- 4
Invoice included
A tax invoice is attached to the confirmation email. Need a custom invoice? Contact us.
Related Standards
GB/T 18115.1-2020 — Chemical analysis methods of rare earth impurities in rare earth metals and their oxides—Part 1:Determination of cerium,praseodymium,neodymium,samarium,europium,gadolinium,terbium,dysprosium,holmium,erbium,thulium,ytterbium,lutetium and yttrium contents in lanthanum metal and oxide
GB/T 18115.10-2006 — Chemical analysis methods of rare earth impurities in rare earth metals and their oxides Holmium-Determination of lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, erbium, thulium, ytterbium, lutetium and yttrium contents
GB/T 18115.11-2006 — Chemical analysis methods of rare earth impurities in rare earth metals and their oxides Erbium-Determination of lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, thulium, ytterbium, lutetium and yttrium contents
Secure payment via Stripe
Payments accepted
GB/T 18115.2-2020
$385.00