GB/T 4325.22-2013Methods for chemical analysis of molybdenum - Part 22: Determination of phosphorus content - Molybdenum blue spectrophotometry (English PDF)
钼化学分析方法 第22部分：磷量的测定 钼蓝分光光度法
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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 4325.22-2013 is the English-translated version of 钼化学分析方法 第22部分：磷量的测定 钼蓝分光光度法.
GB/T 4325.22-2013 is the Chinese standard "Methods for chemical analysis of molybdenum - Part 22: Determination of phosphorus content - Molybdenum blue spectrophotometry".
Its scope clause reads: GB/T 4325 provisions of this part of the molybdenum powder, molybdenum, molybdenum trioxide and determination of the amount of phosphorus ammonium molybdate.
This section applies to molybdenum powder, molybdenum, molybdenum trioxide and ammonium molybdate determination of phosphorus content. Measurement range. 0.0002% - 0.0180%. Its clauses include method summary; reagents; sample; instruments.
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Document preview — GB/T 4325.22-2013
National Standard of the People's Republic of China
- ICS
- 77.120.99
- Classification
- H 63
- Replacing
- GB/T 4325.24-1984
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- 1 Scope
- 2 Method summary
- 3 Reagents
- 4 Sample
- 5 Instruments
1 Scope
GB/T 4325 provisions of this part of the molybdenum powder, molybdenum, molybdenum trioxide and determination of the amount of phosphorus ammonium molybdate.
This section applies to molybdenum powder, molybdenum, molybdenum trioxide and ammonium molybdate determination of phosphorus content. Measurement range. 0.0002% - 0.0180%.
2 Method summary
Sample nitric acid - sulfuric acid decomposition mixed with ammonium hydroxide dissolved molybdenum (molybdenum trioxide and ammonium molybdate used without the acid-soluble, direct hydroxide
Ammonium dissolution), the hydrogen peroxide oxidation of ortho-phosphoric acid and phosphorus complexing molybdenum, iron and other elements, then adding ammonium molybdate, ammonium molybdate phosphorus and phosphorus is formed
Heteropolyoxomolybdate in 0.4mol/L ~ 0.6mol/L sulfuric acid medium, the n-butanol - chloroform mixed solvent to stannous also
Original as phosphorus molybdenum blue, measuring absorbance at 620nm wavelength.
3 Reagents
Unless otherwise indicated in the analysis using only recognized as analytical reagents and secondary distilled water or equivalent purity.
3.1
n-butanol.
3.2
ammonium hydroxide (rho = 0.90g/mL).
3.3
Hydrogen peroxide (19).
3.4
sulfate (15).
3.5 stannous chloride solution (100g/L)
formulated with hydrochloric acid (11).
3.6 ammonium molybdate solution (100g/L)
100g of ammonium molybdate [(NH4) 6Mo7O24 · 4H2O] was dissolved in 1000mL of water, filtered and set aside.
3.7
n-butanol - chloroform extracts were mixed. 3 volumes of chloroform and 1 volume of n-butanol (3.1) are mixed.
3.8 nitric acid - sulfuric acid mixture
50mL nitric acid (rho = 1.42g/mL) and 5mL sulfuric acid (rho = 1.84g/mL), was added 45mL of water,
Mix well.
3.9 Phosphorus standard stock solution
Weigh accurately 0.4393g advance at 105 °C ~ 110 °C baking 1h potassium dihydrogen phosphate reference reagents placed
250mL beaker was added 100mL of water, completely dissolved and transferred to 1000mL volumetric flask. Dilute with water to volume, and mix. This solution
1mL solution containing 100µg phosphorus.
3.10 Phosphorus standard solution
Pipette 5.00mL phosphorus standard stock solution (3.9), placed in 100mL volumetric flask, dilute to the mark, mix uniform. This solution 1mL containing 5µg phosphorus.
4 Sample
Molybdenum should smash through the 0.75mm standard sieve.
5 Instruments
Spectrophotometer.
......
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 4325.22
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 4325.22-2013 | Methods for chemical analysis of molybdenum - Part 22: Determination of phosphorus content - Molybdenum blue spectrophotometry | current edition | Current |
| GB/T 4325.24-1984 | Methods for chemical analysis of molybdenum - Part 22: Determination of phosphorus content - Molybdenum blue spectrophotometry | previous edition | Superseded |
This page sells the current edition, GB/T 4325.22-2013. Earlier editions are listed for reference only.
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GB/T 4325.21-1984 — Methods for chemical analysis of molybdenum--The diphenylcarbazide photometric method for the determination of chromium content
GB/T 4325.23-1984 — Methods for chemical analysis of molybdenum--The combustion-conductometric titration method for the determination of sulphur content
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