GB/T 23274.4-2009Methods for chemical analysis of stannic oxide - Part 4: Determination of lead and copper content - Flame atomic absorption spectrometric method (English PDF)
二氧化锡化学分析方法 第4部分：铅、铜量的测定 火焰原子吸收光谱法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
January 5, 2009
Implementation date
November 1, 2009
Scope
GB/T 23274.4-2009 is the English-translated version of 二氧化锡化学分析方法 第4部分：铅、铜量的测定 火焰原子吸收光谱法.
GB/T 23274.4-2009 is the Chinese standard "Methods for chemical analysis of stannic oxide - Part 4: Determination of lead and copper content - Flame atomic absorption spectrometric method".
Its scope clause reads: This section GB/T 23274 specifies the method for the determination of tin dioxide, lead, copper content. This section applies to the determination of tin oxide of lead, copper content, the determination of lead in the range of 0.0050% to 0.060% copper 0.00050% ~ 0.020%. Its clauses include method summary; reagents; instrument.
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Document preview — GB/T 23274.4-2009
National Standard of the People's Republic of China
- ICS
- 71.040.40
- Classification
- G 10
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- 1 Scope
- 2 Method summary
- 3 Reagents
- 4 Instrument
1 Scope
This section GB/T 23274 specifies the method for the determination of tin dioxide, lead, copper content.
This section applies to the determination of tin oxide of lead, copper content, the determination of lead in the range of 0.0050% to 0.060% copper 0.00050% ~
0.020%.
2 Method summary
Sample decomposition with aqua regia, in 10% aqua regia medium flame atomic absorption spectrometer, with air - acetylene flame measured.
3 Reagents
Test water for the three distilled water.
Nitrate 3.1 (rho1.42g/mL).
3.2
hydrochloride (rho1.19g/mL).
3.3
aqua regia.
3.4 lead standard stock solution
Weigh 0.5000g metallic lead (Pb mass fraction >=99.999%), placed in 200mL beaker, add
20mL of nitric acid (1 + 2), heat gently to dissolve, remove the cooled and transferred to 1000mL volumetric flask, dilute with water to volume, and mix. This solution
1mL containing 500µg lead.
3.5 Lead standard solution
Pipette 20.0mL lead standard stock solution (3.4) in 200mL flask, add 5mL hydrochloric acid (3.2), with
Dilute with water to volume, and mix. This solution 1mL containing 50µg lead.
3.6 Copper Standard stock solution
Weigh 0.5000g copper (mass fraction of copper >=99.999%), placed in 200mL beaker, add
20mL of nitric acid (1 + 1), heat gently to dissolve, remove the cooled and transferred to 1000mL volumetric flask, dilute with water to volume, and mix. This solution
1mL containing 500µg copper.
3.7 Copper Standard Solution
Pipette 20.0mL copper standard stock solution (3.6) in 1000mL volumetric flask, was added 5mL hydrochloric acid (3.2),
Dilute with water to volume, and mix. This solution 1mL containing 10µg copper.
4 Instrument
Atomic absorption spectrometer, with lead, copper hollow cathode lamp.
Under optimum working conditions for those who can reach the following indicators can be used.
--- Characteristic concentration. a solution in the matrix is consistent with the measured solution, characteristic concentration of lead should not exceed 0.12µg/mL, the characteristics of copper
Concentration should not exceed 0.03µg/mL.
--- Precision. measure 10 times the absorbance of the highest concentration of the standard solution, the standard deviation should not exceed 1% of the average absorbance; with
The lowest concentration of standard solution (not "zero" concentration of the standard) measuring the absorbance of 10 times, the standard deviation should not exceed the maximum concentration
0.5% of the mean absorbance of the standard solution.
--- Linear curve. A standard curve is divided into five sections according to concentration, absorbance difference of the absorbance difference between the highest and the lowest segment segment
Ratio of not less than 0.7.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
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GB/T 23274.1-2009 — Methods for chemical analysis of stannic oxide - Part 1: Determination of stannic oxide content - Potassium iodate titrimetric method
GB/T 23274.2-2009 — Methods for chemical analysis of stannic oxide - Part 2: Determination of iron content - 1, 10-phenanthroline photometric method
GB/T 23274.3-2009 — Methods for chemical analysis of stannic oxide - Part 3: Determination of arsenic content - Molybdoantimonyarsenate blue spectrophotometric method
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