GB/T 16658-2007 English PDF

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GB/T 16658-2007: Determination of chromium cadmium and lead in coal
Status: Valid

GB/T 16658: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 16658-2007	159	Add to Cart	3 days	Determination of chromium cadmium and lead in coal	Valid
GB/T 16658-1996	239	Add to Cart	2 days	Determination of chromium cadmium and lead in coal	Obsolete

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Basic data

Standard ID: GB/T 16658-2007 (GB/T16658-2007)
Description (Translated English): Determination of chromium cadmium and lead in coal
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: D21
Classification of International Standard: 73.040
Word Count Estimation: 6,612
Date of Issue: 2007-11-01
Date of Implementation: 2008-06-01
Older Standard (superseded by this standard): GB/T 16658-1996
Quoted Standard: GB/T 483
Regulation (derived from): National Standard Approval Announcement 2007 No.12 (Total No.112)
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the determination of chromium, test procedures, , lead reagents, , instruments and methods of calculation accuracy of the results of cadmium density. This standard applies to lignite, bituminous coal and anthracite.

GB/T 16658-2007: Determination of chromium cadmium and lead in coal

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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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