GB/T 4372.4-2015Methods for chemical analysis of zincoxide produced by direct process - Part 4: Determination of cadmium oxide content - Flame atomic absorption spectrometry method (English PDF)
直接法氧化锌化学分析方法 第4部分：氧化镉量的测定 火焰原子吸收光谱法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
September 11, 2015
Implementation date
April 1, 2016
Scope
GB/T 4372.4-2015 is the English-translated version of 直接法氧化锌化学分析方法 第4部分：氧化镉量的测定 火焰原子吸收光谱法.
GB/T 4372.4-2015 is the Chinese standard "Methods for chemical analysis of zincoxide produced by direct process - Part 4: Determination of cadmium oxide content - Flame atomic absorption spectrometry method".
Its scope clause reads: This part of GB/T 4372 specifies the method for the determination of cadmium oxide in direct zinc oxide. This part applies to the determination of cadmium oxide in direct zinc oxide.
Measuring range. 0.0020% ~ 0.300%. Its clauses include method summary; reagent; instruments; samples.
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Document preview — GB/T 4372.4-2015
National Standard of the People's Republic of China
- ICS
- 77.120.60
- Classification
- H 13
- Replacing
- GB/T 4372.4-2001
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- 1 Scope
- 2 method summary
- 3 reagent
- 4 instruments
- 5 samples
1 Scope
This part of GB/T 4372 specifies the method for the determination of cadmium oxide in direct zinc oxide.
This part applies to the determination of cadmium oxide in direct zinc oxide. Measuring range. 0.0020% ~ 0.300%.
2 method summary
The sample was dissolved in nitric acid and used in a dilute nitric acid medium using an air-acetylene flame at a wavelength of 228.8 nm at the atomic absorption spectrometer
Cadmium absorbance, the standard curve method to calculate the amount of cadmium oxide.
3 reagent
Unless otherwise stated, only the reagents identified as analytical reagents and distilled or deionized water or comparable purity were used in the analysis.
3.1
nitric acid (rho = 1.42 g/mL).
3.2
nitric acid (1 1).
3.3 Cadmium standard storage solution
Weigh 1.0000g metal cadmium (wCd >= 99.99%) placed in 250mL beaker, add 10mL nitric acid (3.2), slightly heat dissolved, remove the cooling, into the 1000mL volumetric flask, add 40mL nitric acid (3.2), diluted with water to the mark, mix.
1 mL of this solution contains 100 µg of cadmium.
3.4 Cadmium standard solution
Remove 10.00mL cadmium standard storage solution (3.3) in 100mL volumetric flask, add 5mL nitric acid (3.2), with
Water diluted to the mark, mix well. 1 mL of this solution contains 10 µg of cadmium, respectively
4 instruments
Atomic Absorption Spectrometer, Cadmium Hollow Cathode Lamp.
In the best working conditions of the instrument, who can meet the following indicators can be used.
Sensitivity. The concentration of copper and cadmium should not be greater than 0.035 µg/mL in solutions consistent with the measurement sample solution matrix.
Precision. the highest concentration of the standard solution measured 10 times the absorbance, the standard deviation should not exceed 1.0% of the average absorbance; with the most
Low standard solution (not zero standard solution) measured 10 times the absorbance, the standard deviation does not exceed the maximum concentration of standard solution average absorbance
0.5% of the degree.
The linearity of the working curve. the ratio of the difference between the absorbance difference and the absorbance difference of the lowest section is divided into five segments according to the concentration,
Should not be less than 0.7.
5 samples
5.1
Specimen size should be less than 0.10mm.
......
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 4372.4
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 4372.4-2015 | Methods for chemical analysis of zincoxide produced by direct process - Part 4: Determination of cadmium oxide content - Flame atomic absorption spectrometry method | current edition | Current |
| GB/T 4372.4-2001 | Methods for chemical analysis of zincoxide produced by direct process - Part 4: Determination of cadmium oxide content - Flame atomic absorption spectrometry method | previous edition | Superseded |
This page sells the current edition, GB/T 4372.4-2015. Earlier editions are listed for reference only.
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Related Standards
GB/T 4372.5-2014 — Methods for chemical analysis of zinc oxide produced by direct process - Part 5: Determination of manganese content - Flame atomic absorption spectrometry method
GB/T 4372.3-2001 — Methods for chemical analysis of zinc oxide produced by direct process - Determination of copper oxide content - Atomic absorption spectrometry method
GB/T 4372.5-2001 — Methods for chemical analysis of zinc oxide produced by direct process - Determination of zinc oxide manganese content - Atomic absorption spectrometry method
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