GB/T 18115.1-2020Chemical 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 (English PDF)

Foreword

GB/T 18115 "Methods for chemical analysis of rare earth impurities in rare earth metals and their oxides" is divided into 15 parts.

---Part 1: Determination of cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and yttrium in lanthanum;

---Part 2: Determination of lanthanum, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and yttrium in cerium;

---Part 3: Determination of lanthanum, cerium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and yttrium in praseodymium;

---Part 4: Determination of lanthanum, cerium, praseodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and yttrium in neodymium;

---Part 5: Determination of lanthanum, cerium, praseodymium, neodymium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and yttrium in samarium;

---Part 6: Determination of lanthanum, cerium, praseodymium, neodymium, samarium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and yttrium in europium;

---Part 7: Determination of lanthanum, cerium, praseodymium, neodymium, samarium, europium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and yttrium in gadolinium;

---Part 8: Determination of lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and yttrium in terbium;

---Part 9: Determination of lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, holmium, erbium, thulium, ytterbium, lutetium and yttrium in dysprosium;

---Part 10: Determination of lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, erbium, thulium, ytterbium, lutetium and yttrium in holmium;

---Part 11: Determination of the amount of lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, thulium, ytterbium, lutetium and yttrium in erbium;

---Part 12: Determination of lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium in yttrium;

---Part 13: Determination of lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, ytterbium, lutetium and yttrium in thulium;

---Part 14: Determination of lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, lutetium and yttrium in ytterbium;

--- Part 15: Determination of lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and yttrium in lutetium.

This part is Part 1 of GB/T 18115.

This section was drafted in accordance with the rules given in GB/T 1.1-2009.

This part replaces GB/T 18115.1-2006 "Methods for Chemical Analysis of Rare Earth Impurities in Rare Earth Metals and Their Oxides" in lanthanum, cerium, praseodymium, Determination of the amount of neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and yttrium", compared with GB/T 18115.1-2006, except for editorial changes The main technical changes are as follows.

---The measurement range of Method 1 is modified, and the lower limits of determination of europium oxide, gadolinium oxide, dysprosium oxide, holmium oxide, and erbium oxide are respectively changed from Adjust from 0.0005% to 0.0003%, and adjust the upper limits of cerium oxide, praseodymium oxide, neodymium oxide, samarium oxide, and yttrium oxide from 0.10%, respectively Adjust the upper limit of dysprosium oxide, holmium oxide, erbium oxide, thulium oxide, ytterbium oxide, and lutetium oxide from 0.050% to 0.050%. 0.10% (see Chapter 1, Chapter 1 of the 2006 edition);

---Modify the pretreatment conditions of the samples in Method 1 and Method 2, from "900°C firing 1h" to "Oxide sample in Bake at 105°C for 1 hour, place in a desiccator, cool to room temperature, and weigh immediately. The surface oxide layer should be removed from the metal sample, That is weighing" (see 2.4, 3.4, Chapter 5 and Chapter 14 of the 2006 edition);

---Modify the weighing amount of the measured element in Method 1 (see 2.5.1, 6.1 of the 2006 edition);

---Added method 1 blank test (see 2.5.3);

---Delete the reference spectrum line Pr422.533nm in Method 1; modify the reference spectrum line and adjust Tm342.908nm to Tm342.508nm (see 2.6.1, Chapter 6 of the 2006 edition);

--- Modify the repeatability and tolerance in Method 1 and Method 2 (see 2.8, 3.7, Chapter 8 and Chapter 17 of the 2006 edition);

---The measurement range of method 2 is modified, the lower limit of cerium oxide is adjusted from 0.0001% to 0.00005%, and the lower limit of yttrium oxide is changed from 0.0001% is adjusted to 0.00003%, and the lower limits of samarium oxide, gadolinium oxide, and terbium oxide are adjusted from 0.00005% to 0.00003%, adjust the lower limits of europium oxide, dysprosium oxide, erbium oxide, and ytterbium oxide from 0.00005% to 0.00002%, respectively.

The lower limits of holmium oxide, thulium oxide, and lutetium oxide were adjusted from 0.00005% to 0.00001% respectively (see Table 2, 2006 edition Chapter 10);

---Modified the concentration of nitric acid in the reagents and materials in Method 2 and adjusted nitric acid (1 19) to nitric acid (1 49) (see 3.2.6, 2006 Chapter 12 of the edition);

---Added the internal standard element cesium in Method 2 (see 3.2.23, 3.5.4, 3.5.5, 15.4 and 15.5 of the 2006 edition).

1 Scope

This part of GB/T 18115 specifies cerium 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 content determination method.

This part applies to cerium oxide, praseodymium oxide, neodymium oxide, samarium oxide, europium oxide, gadolinium oxide, terbium oxide, dysprosium oxide, holmium oxide, Determination of erbium oxide, thulium oxide, ytterbium oxide, lutetium oxide and yttrium oxide content.

This section also applies to the determination of cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and yttrium in metal lanthanum.

This part contains two methods. method 1 inductively coupled plasma atomic emission spectrometry, method 2 inductively coupled plasma mass spectrometry law. The measurement range of Method 1 is shown in Table 1, and the measurement range of Method 2 is shown in Table 2.