GB/T 4325.19-2013Methods for chemical analysis of molybdenum - Part 19: Determination of chromium content - Diphenylcarbazide spectrophotometry (English PDF)
钼化学分析方法 第19部分：铬量的测定 二苯基碳酰二肼分光光度法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
May 9, 2013
Implementation date
February 1, 2014
Scope
GB/T 4325.19-2013 is the English-translated version of 钼化学分析方法 第19部分：铬量的测定 二苯基碳酰二肼分光光度法.
GB/T 4325.19-2013 is the Chinese standard "Methods for chemical analysis of molybdenum - Part 19: Determination of chromium content - Diphenylcarbazide spectrophotometry".
Its scope clause reads: GB/T 4325 provisions of this part of the determination of the amount of chromium molybdenum. This section applies to molybdenum powder, molybdenum, molybdenum trioxide, ammonium molybdate determination of chromium content.
Determination range of 0.00020% to 0.015%. Its clauses include method summary; reagents; sample.
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Document preview — GB/T 4325.19-2013
National Standard of the People's Republic of China
- ICS
- 77.120.99
- Classification
- H 63
- Replacing
- GB/T 4325.21-1984
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- 1 Scope
- 2 Method summary
- 3 Reagents
- 4 Sample
1 Scope
GB/T 4325 provisions of this part of the determination of the amount of chromium molybdenum.
This section applies to molybdenum powder, molybdenum, molybdenum trioxide, ammonium molybdate determination of chromium content. Determination range of 0.00020% to 0.015%.
2 Method summary
Samples with sulfuric acid, ammonium sulfate decomposed to beryllium hydroxide as a carrier in pH8 ~ 9 co-precipitation of chromium, and molybdenum separation. The precipitate was dissolved in sulfuric acid,
Plus two phenyl hydrazine with carbonyldiimidazole chromium complexes formed purple, absorbance was measured.
3 Reagents
Unless otherwise indicated in the analysis using only recognized as analytical reagents and secondary distilled water or equivalent purity.
3.1
ammonium sulfate (excellent pure).
Anhydrous sodium sulfite 3.2.
3.3
sulfate (rho = 1.84g/mL).
3.4
sulfate (1mol/L).
3.5
ammonium hydroxide (rho = 0.90g/mL), ultra-pure.
3.6
phosphate (11).
3.7
beryllium sulfate solution (20g/L).
3.8
potassium permanganate solution (3g/L).
3.9 sodium azide (50g/L)
5g sodium azide were dissolved in 100mL water.
3.10 bath
a solution of ammonium sulfate (10g/L), ammonium hydroxide (3.5) was basified to pH8 ~ 9.
3.11
diphenyl hydrazine acetone solution of carbonyldiimidazole (5g/L), with the preparation.
3.12
phenolphthalein ethanol solution (1g/L).
3.13 chromium standard stock solution
Weigh 0.2263g pre-drying at 140 °C ~ potassium dichromate 150 °C, dissolved in water, the water moved
1000mL volumetric flask and dilute to volume, and mix. This solution 1mL containing 80µg chromium.
3.14 Chromium standard solution
Pipette 5.00mL chromium standard stock solution (3.13), placed in 100mL beaker, add 20mL water, 5mL sulfur
Acid (3.3), the number of tablets (approximately 3mg) of anhydrous sodium sulfite (3.2), boil rush sulfur dioxide, cooled and transferred to 200mL volumetric flask, dilute with water
Diluted to volume, and mix. This solution 1mL containing 2µg chromium.
4 Sample
Molybdenum should smash through the 0.75mm standard sieve.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Similar standards
Editions of GB/T 4325.19
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 4325.19-2013 | Methods for chemical analysis of molybdenum - Part 19: Determination of chromium content - Diphenylcarbazide spectrophotometry | current edition | Current |
| GB/T 4325.21-1984 | Methods for chemical analysis of molybdenum - Part 19: Determination of chromium content - Diphenylcarbazide spectrophotometry | previous edition | Superseded |
This page sells the current edition, GB/T 4325.19-2013. Earlier editions are listed for reference only.
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Related Standards
GB/T 4325.20-2013 — Methods for chemical analysis of molybdenum - Part 20: Determination of manganese content - Flame atomic absorption spectrometry
GB/T 4325.18-1984 — Methods for chemical analysis of molybdenum--The atomic absorption spectrophotometric method for the determination of potassium content
GB/T 4325.20-1984 — Methods for chemical analysis of molybdenum--The N-benzoyl-N-phenylhydroxylamine photometric method for the determination of vanadium content
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