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| GB/T 16658-2026 | English | RFQ |
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Determination of copper, cobalt, nickel, zinc, chromium, cadmium and lead in coal
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| GB/T 16658-2007 | English | 159 |
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Determination of chromium cadmium and lead in coal
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| GB/T 16658-1996 | English | 239 |
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Determination of chromium cadmium and lead in coal
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Standard similar to GB/T 16658-2026 GB/T 16659 | GB/T 18511 | GB/T 16415 | GB/T 19560 | Basic data | Standard ID | GB/T 16658-2026 (GB/T16658-2026) | | Description (Translated English) | Determination of copper, cobalt, nickel, zinc, chromium, cadmium and lead in coal | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | D21 | | Classification of International Standard | 73.040 | | Date of Issue | 2026-03-31 | | Date of Implementation | 2026-10-01 | | Older Standard (superseded by this standard) | GB/T 16658-2007, GB/T 19225-2003 | | Issuing agency(ies) | State Administration for Market Regulation, Standardization Administration of China | GB/T 16658-2007: Determination of chromium cadmium and lead in coal---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Determination of chromium cadium and lead in coal
ICS 73.040
D21
National Standards of People's Republic of China
Replacing GB/T 16658-1996
Chromium, cadmium, determination of lead in coal
Posted 2007-11-01
2008-06-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard replaces GB/T 16658-1996 "chromium, cadmium and lead in coal."
This standard compared with GB/T 16658-1996, the main changes are as follows.
--- Cd, Pb mixed standard working solution consisting of 50μg/mL to 20μg/mL (1996 edition 3.8, this version 4.9);
--- Chromium standard working solution concentration by the 50μg/mL to 20μg/mL (1996 edition 3.9, this version 4.10);
The standard proposed by China Coal Industry Association.
This standard by the National Standardization Technical Committee of Coal.
This standard was drafted. CCRI coal analysis laboratory.
The main drafters. Zhang Ke Rui, Jiang Jinhai, Zheng Li.
This standard replaces the standards previously issued as follows.
--- GB/T 16658-1996.
Chromium, cadmium, determination of lead in coal
1 Scope
This standard specifies the coal chromium, cadmium, lead reagents, equipment, measurement test procedure, results calculation and precision of the method.
This standard applies to lignite, bituminous coal and anthracite.
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research
Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.
GB/T 483 coal analysis test methods - General provisions
3 Method summary
After the coal ash, with hydrofluoric acid - perchloric acid decomposition of sodium sulfate in nitric acid medium to eliminate magnesium and other interfering effect of chromium, with the original
Sub absorption was measured.
4 Reagents
Unless otherwise indicated, the reagents used in this standard are excellent pure, the water is deionized water.
4.1 hydrofluoric acid (GB/T 620). 40% or more.
4.2 perchloric acid (GB/T 623). more than 70.0%.
4.3 nitric acid (GB/T 626) solution. volume ratio of (1 + 1).
4.4 nitrate (GB/T 626) solution. volume ratio of (1 + 99).
4.5 sulfate solution.200g/L. Weigh 200g of anhydrous sodium sulfate (GB/T 9853) in 1000mL beaker, add a small amount of water to dissolve
After transferred to 1000mL volumetric flask, diluted with water to the mark. Transferred to plastic bottles.
4.6 cadmium standard stock solution. 1mg/mL.
Weigh 1.0000g (weighing accuracy of 0.0002g) high purity metal cadmium (mass fraction of 99.99%) in the 300mL beaker, add nitric acid solution
Solution (4.3) 50mL, until all dissolved moved 1000mL volumetric flask, dilute to the mark, shake. Transferred to plastic bottles.
4.7 lead standard stock solution. 1mg/mL.
Weigh 1.0000g (weighing accuracy of 0.0002g) of high purity metallic lead (mass fraction of 99.99%) in the 300mL beaker, add nitric acid solution
Solution (4.3) 50mL, until completely dissolved moved 1000mL volumetric flask, dilute to the mark, shake. Transferred to plastic bottles.
4.8 Chromium standard stock solution. 1mg/mL.
Weigh spectroscopically pure potassium dichromate (GB 1259) 2.8288g (weighing accuracy of 0.0002g) in 300mL beaker, add water and nitric acid solution
(4.3) each 50mL, until completely dissolved moved 1000mL volumetric flask, diluted with water to the mark. Transferred to plastic bottles.
4.9 cadmium, lead mixed standard working solution. each 20μg/mL.
Imbibe cadmium standard stock solution (4.6) and lead standard stock solution (4.7) each 10mL in 500mL flask, dissolved with nitric acid
Solution (4.4) diluted to the mark. Transferred to plastic bottles.
4.10 Chromium standard solution. 20μg/mL.
Imbibe chromium standard stock solution (4.8) 10mL to 500mL volumetric flask, dilute nitric acid solution (4.4) to the mark.
Transferred to plastic bottles.
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