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SN/T 4572-2016: Determination of mercury content in copper concentrates--Enter solid sampling-direct determination of mercury analysis method
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SN/T 4572-2016: Determination of mercury content in copper concentrates--Enter solid sampling-direct determination of mercury analysis method

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Determination of mercury content in copper concentrates--Enter solid sampling-direct determination of mercury analysis method China's entry-exit inspection and quarantine industry standards Determination of mercury in copper concentrates Solid sample injection - direct mercury analyzer Enter solidsampling-directdeterminationofmercuryanalysismethod Published on.2016-08-23 2017-03-01 Implementation China The State Administration of Quality Supervision, Inspection and Quarantine issued Inspection and Quarantine of the People's Republic of China Industry Standard Determination of mercury in copper concentrates Solid sample injection - direct mercury analyzer China Standard Press Publishing First edition of January.2018

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard is proposed and managed by the National Certification and Accreditation Regulatory Commission. This standard is mainly drafted by the People's Republic of China Tianjin Entry-Exit Inspection and Quarantine Bureau. The main drafters of this standard. Guo Fen, Yang Jinkun, Su Mingyue, and Song Yi. Determination of mercury in copper concentrates Solid sample injection - direct mercury analyzer Warnings - Persons using this standard should have practical experience in regular laboratory work. This standard does not indicate all possible safety problem. Users have the responsibility to take appropriate safety and health measures and to ensure that they meet the conditions of the relevant national regulations.

1 Scope

This standard specifies the method of direct mercury injection by solid sample to determine mercury content in copper concentrates. This standard applies to the determination of mercury content in copper concentrates. The measurement range is. 0.0050μg/g~15μg/g.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article Pieces. For undated references, the latest version (including all amendments) applies to this document. GB/T 6379.2 Accuracy (trueness and precision) of measurement methods and results Part 2. Determination of standard measurement methods The basic method of sex and reproducibility GB/T 6682 Analysis Laboratory Water Specifications and Test Methods GB/T 8170 Representation and Determination of Numerical Rounding Rules and Limit Values GB/T 14263 bulk flotation copper concentrate sampling and sample preparation method JJG548 Mercury Analyzer Verification Procedure

3 Method summary

In an oxygen atmosphere, the sample is dried and decomposed at high temperatures in a decomposition furnace. Decomposition products are sent to the catalytic furnace through an oxygen stream. After removal of impurities and catalytic decomposition, the mercury in the sample is decomposed into mercury atoms at high temperature, and is taken into the gold amalgamation tube by oxygen flow for selective capture. After purging the purification system with oxygen, the tubes are rapidly heated to release mercury vapor. Mercury vapors are carried into a single-wavelength optical absorption cell at wavelengths Absorbance of mercury was measured at 253.65 nm and quantified using a standard curve method.

4 Reagents and materials

Except where otherwise stated in the analysis, only approved grades of pure reagents and first grade water in accordance with GB/T 6682 or equivalent purity are used. Water. 4.1 Reagents 4.1.1 Nitric acid (HNO3), ρ=1.42 g/mL. 4.1.2 Potassium dichromate (K2Cr2O7). 4.1.3 Oxygen (O2), purity ≥ 99.99%. 4.2 reagent preparation 4.2.1 Nitric acid solution (1 9). Measure 10 mL of nitric acid (4.1.1) into 90 mL of water and mix. ...