GB/T 7739.12-2016Methods for chemical analysis ofgoldconcentrates - Part 12: Determination of arsenic, mercury, cadmium, lead, bismuth - Atomic fluorescence spectrometric method (English PDF)
金精矿化学分析方法 第12部分：砷、汞、镉、铅和铋量的测定 原子荧光光谱法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
August 29, 2016
Implementation date
July 1, 2017
Scope
GB/T 7739.12-2016 is the English-translated version of 金精矿化学分析方法 第12部分：砷、汞、镉、铅和铋量的测定 原子荧光光谱法.
GB/T 7739.12-2016 is the Chinese standard "Methods for chemical analysis ofgoldconcentrates - Part 12: Determination of arsenic, mercury, cadmium, lead, bismuth - Atomic fluorescence spectrometric method".
Its scope clause reads: This part of GB/T 7739 specifies the determination of arsenic, mercury, cadmium, lead and bismuth in gold concentrates. This part applies to the determination of arsenic, mercury, cadmium, lead and bismuth in gold concentrates. Measuring range. 0.00004% ~ 0.20%. Its clauses include method summary; reagent.
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Document preview — GB/T 7739.12-2016
National Standard of the People's Republic of China
- ICS
- 77.150.99
- Classification
- D 46
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- 1 Scope
- 2 method summary
- 3 reagent
- 3.6 Hydrochloric acid (1 1)
- 3.7 Hydrochloric acid (1 19)
- 3.8 Hydrochloric acid (1 49)
- 3.9 nitric acid (14)
- 3.10 Sulfuric acid (1 4)
- 3.11 mixed acid (1 3 4)
- 3.14 potassium borohydride solution I (20g/L)
- 3.15 Potassium borohydride solution II (20g/L)
1 Scope
This part of GB/T 7739 specifies the determination of arsenic, mercury, cadmium, lead and bismuth in gold concentrates.
This part applies to the determination of arsenic, mercury, cadmium, lead and bismuth in gold concentrates. Measuring range. 0.00004% ~ 0.20%.
2 method summary
The sample was dissolved in a water bath with hydrochloric acid and nitric acid or dissolved in hydrochloric acid, nitric acid, perchloric acid and hydrofluoric acid. The As (V) in the test solution was treated with a reducing agent, (III), Cd (IV) is prereduced to Cd (II), lead, mercury and bismuth are not pre-reduced, masking agent is used to mask the interfering elements in the test solution.
A certain acidity, the test solution and potassium borohydride solution through the hydride generator to produce hydride, with the carrier gas into the quartz tube atomization, atomic fluorescence
The fluorescence intensity was measured on a light spectrometer and the arsenic, mercury, cadmium, lead and bismuth were calculated according to the standard curve method.
3 reagent
Unless otherwise stated, only reagents and secondary deionized water identified as analytical pure were used in the analysis.
3.1
hydrochloric acid (rho1.19g/mL), excellent grade pure.
3.2
nitric acid (rho1.42g/mL), excellent grade pure.
3.3
hydrofluoric acid (rho1.18g/mL), excellent grade pure.
3.4
perchloric acid (rho1.76g/mL), excellent grade pure.
3.5
sulfuric acid (rho1.84g/mL), excellent grade pure.
3.6 Hydrochloric acid (1 1)
diluted with hydrochloric acid (3.1).
3.7 Hydrochloric acid (1 19)
diluted with hydrochloric acid (3.1).
3.8 Hydrochloric acid (1 49)
diluted with hydrochloric acid (3.1).
3.9 nitric acid (14)
diluted with nitric acid (3.2).
3.10 Sulfuric acid (1 4)
diluted with sulfuric acid (3.5).
3.11 mixed acid (1 3 4)
1 volume nitric acid (3.2), 3 volumes of hydrochloric acid (3.1) and 4 volumes of water mixed evenly, is now available.
3.12
Sodium hydroxide (5 g/L).
3.13
Sodium hydroxide (200 g/L).
3.14 potassium borohydride solution I (20g/L)
Weigh 10.0g potassium borohydride dissolved in 500mL sodium hydroxide solution (3.12), is now available.
3.15 Potassium borohydride solution II (20g/L)
Weigh 10.0g potassium borohydride in 500mL sodium hydroxide solution (3.12), add 5g
Potassium ferricyanide, dissolved, is now available.
3.16
thiourea - ascorbic acid solution (100 g/L).
3.17
oxalic acid (80g/L).
3.18
Cobalt chloride hexahydrate solution (0.5g/L).
3.19
Sodium pyrophosphate (20 g/L).
......
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 7739.1-2019 — Methods for chemical analysis of gold concentrates - Part 1: Determination of gold and silver contents
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