GB/T 30921.2-2016Test method of purified terephthalic acid (PTA) for industrial use—Part 2: Determination of metal content (English PDF)
工业用精对苯二甲酸（PTA）试验方法 第2部分：金属含量的测定
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
June 14, 2016
Implementation date
January 1, 2017
Scope
GB/T 30921.2-2016 is the English-translated version of 工业用精对苯二甲酸（PTA）试验方法 第2部分：金属含量的测定.
GB/T 30921.2-2016 is the Chinese standard "Test method of purified terephthalic acid (PTA) for industrial use—Part 2: Determination of metal content".
Its scope clause reads: This part of GB/T 30921 specifies the atomic absorption spectrophotometric method for the determination of the metal content in industrial terephthalic acid (PTA) And inductively coupled plasma emission spectroscopy.
This part of the flame atomic absorption spectrophotometry for sodium, cobalt, manganese, iron, chromium, nickel, molybdenum, aluminum content of not less than 0.05mg/kg PTA sample determination; graphite furnace atomic absorption spectrophotometry for sodium content of not less than 0.001mg/kg, cobalt, manganese, iron, chromium, nickel, Molybdenum, titanium, aluminum content of not less than 0.005mg/kg of PTA sample determination; inductively coupled plasma emission spectrometry for sodium, chromium, cobalt, Aluminum, titanium, potassium, magnesium content of not less than 0.020mg/kg, manganese, iron, nickel, molybdenum, calcium content of not less than 0.055mg/kg PTA sample determination. Its clauses include normative reference documents.
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Document preview — GB/T 30921.2-2016
National Standard of the People's Republic of China
- ICS
- 71.080.40
- Classification
- G 16
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- 1 Scope
- 2 normative reference documents
- 3.1 Method Summary
- 3.2 Reagents and Materials
1 Scope
This part of GB/T 30921 specifies the atomic absorption spectrophotometric method for the determination of the metal content in industrial terephthalic acid (PTA)
And inductively coupled plasma emission spectroscopy.
This part of the flame atomic absorption spectrophotometry for sodium, cobalt, manganese, iron, chromium, nickel, molybdenum, aluminum content of not less than 0.05mg/kg
PTA sample determination; graphite furnace atomic absorption spectrophotometry for sodium content of not less than 0.001mg/kg, cobalt, manganese, iron, chromium, nickel,
Molybdenum, titanium, aluminum content of not less than 0.005mg/kg of PTA sample determination; inductively coupled plasma emission spectrometry for sodium, chromium, cobalt,
Aluminum, titanium, potassium, magnesium content of not less than 0.020mg/kg, manganese, iron, nickel, molybdenum, calcium content of not less than 0.055mg/kg PTA sample determination.
2 normative reference documents
The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this article
Pieces. For undated references, the latest edition (including all modifications) applies to this document.
Preparation of standard solutions for the determination of impurities in chemical reagents GB/T 602-2002
General rules for sampling of solid chemical products GB/T GB/T 6682 Analytical laboratory water specifications and test methods
GB 6819 dissolved acetylene
Representation and Judgment of Numerical Correction Rule and Limit Value of GB/T 8170
Method A - Flame Atomic Absorption Spectrophotometry
3.1 Method Summary
Under the conditions specified in this part, the PTA sample is ignited and burned at 750 ° C for 45 min to dissolve the ash in dilute nitric acid.
And then analyzed by flame atomic absorption spectrophotometry, quantitative curve by working curve method.
3.2 Reagents and Materials
3.2.1
Unless otherwise specified, the reagents used are of analytical grade and the test water complies with the secondary water in GB/T 6682; the standard solution
GB/T 602-2002 formulated, or commercially available.
3.2.2 nitric acid solution
1 1, with excellent grade pure nitric acid preparation.
3.2.3 anhydrous ethanol
excellent grade pure.
3.2.4
Cesium nitrate aqueous solution (cesium content of 6.25g/L). Weigh 0.917g of cesium nitrate dissolved in the amount of water, transferred to 100mL capacity
Bottle, add 40mL of anhydrous ethanol shake, then diluted to the water scale, shake.
3.2.5 Cesium nitrate solution (cesium content 50g/L)
Weigh 7.332g of cesium nitrate dissolved in water, transferred to 100mL volumetric flask, diluted with water […]
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
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Related Standards
GB/T 30921.1-2014 — Test method of purified terephthalic acid (PTA) for industrial use - Part 1: Determination of concentrations of 4-carboxybenzaldehyde (4-CBA) and p-toluic acid (p-TOL)
GB/T 30921.3-2016 — Test method of purified terephthalic acid (PTA) for industrial use - Part 3: Determination of water content
GB/T 30921.4-2016 — Test method of purified terephthalic acid (PTA) for industrial use—Part 4: Determination of titanium content—Diantipyrylmethane photometric method
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