GBZ21275-2007 English PDF

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GBZ21275-2007: Determination of regulated substance (hexavalent chromium) in electrical and electronic equipment
Status: Obsolete

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/Z 21275-2007	279	Add to Cart	3 days	Determination of regulated substance (hexavalent chromium) in electrical and electronic equipment	Obsolete

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Basic data

Standard ID: GB/z 21275-2007 (GB/z21275-2007)
Description (Translated English): Determination of regulated substance (hexavalent chromium) in electrical and electronic equipment
Sector / Industry: National Standard
Classification of Chinese Standard: L10
Classification of International Standard: 31.020
Word Count Estimation: 7,782
Date of Issue: 2007-12-20
Date of Implementation: 2008-06-01
Regulation (derived from): ?National Standard Announcement 2007 No.13 (Total No.113)
Issuing agency(ies): Ministry of Health of the People's Republic of China
Summary: This standard specifies the method for the determination of various types of electrical and electronic products hexavalent chromium. The technical guidance document for the determination of all types of electrical and electronic products hexavalent chromium.

GBZ21275-2007: Determination of regulated substance (hexavalent chromium) in electrical and electronic equipment

---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 converted substance (hexavalent chromium) in electrical and electronic equipment ICS 31.020 L10 National Standardization Guidance Technical Document of the People's Republic of China Method for detecting hexavalent chromium in restricted substances in electronic and electrical products Released on.2007-12-20 General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China China National Standardization Administration issued

Foreword

This guidance document is presented by the Environmental Standardization Technical Committee (SAC/TC297) of the National Electrical and Electronic Products and Systems. Return to the mouth. The main technical draft of this guiding technical document is. Shenzhen Institute of Metrology and Quality Inspection. This guiding technical document participated in the drafting unit. Shenzhen Entry-Exit Inspection and Quarantine Bureau, Chengdu Product Quality Supervision and Inspection Institute, Zhejiang Fangyuan Testing Group Co., Ltd., China Quality Certification Center, Beijing Pani Physicochemical Analysis and Testing Center. The main drafters of this guiding technical document. Li Xiang, Yang Wanying, Li Bifang, Luo Meizhong, Chen Zeyong, Huang Xiaolong, Liu Zhihong, Li Ying, Song Wei, Xiang Xu, Chen Xiaozhen, Zhou Yulin, Dong Yongsheng. This guidance document is the first release. Method for detecting hexavalent chromium in restricted substances in electronic and electrical products

1 Scope

This guidance document specifies methods for the determination of hexavalent chromium in various electrical and electronic products. This guidance document applies to the determination of hexavalent chromium in various electrical and electronic products. 2 Method 1-Diphenylcarbazide Spectrophotometry 2.1 Principle Extracting water-soluble and water-insoluble hexavalent chromium compounds from electrical and electronic products using extracts, separating samples and extracts, and extracting The hexavalent chromium in the liquid is reacted with diphenylcarbazide in an acidic solution to form a purple-red complex, which is carried out at a maximum absorption wavelength of 540 nm. Spectrophotometric quantification. The lower limit of quantification of the method. 2.0 mg/kg. 2.2 Reagents and materials Unless otherwise stated, reagents that meet national or industrial standards, deionized water or water of equivalent purity (resistivity) are used. 18.2MΩ). 2.2.1 Sulfuric acid. excellent grade pure. 2.2.2 Dipotassium hydrogen phosphate. analytically pure. 2.2.3 Potassium dihydrogen phosphate. analytically pure. 2.2.4 anhydrous magnesium chloride. analytically pure. 2.2.5 1,5-Diphenylcarbazide. Analytically pure. 2.2.6 Sodium hydroxide. analytically pure. 2.2.7 anhydrous sodium carbonate. analytically pure. 2.2.8 Acetone. Analytical grade. 2.2.9 Sodium dihydrogen phosphate monohydrate. analytically pure. 2.2.10 Potassium dichromate. certified standard substance. 2.2.11 Sulfuric acid, 10% (volume ratio). Pipette 10mL sulfuric acid (2.2.1) slowly into 80mL water, transfer to 100mL volumetric flask Dilute to the mark with water. 2.2.12 1,5-Diphenylcarbazide developer. Weigh 0.5g of 1,5-diphenylcarbazide (2.2.5) dissolved in 100mL of acetone (2.2.8 ) After that, transfer to a brown bottle for cryopreservation. When the solution fades, it should be discarded and reconstituted. 2.2.13 Extract. Weigh (20.00 ± 0.05) g of sodium hydroxide (2.2.6) and (30.00 ± 0.05) g of anhydrous sodium carbonate (2.2. 7), with water Dissolve and dilute to 1L, seal (20 ~ 25) ° C in a polyethylene plastic bottle, the shelf life of 1 month. 2.2.14 Buffer A. Weigh 87.09g of dipotassium hydrogen phosphate (2.2.2) and 68.04g of potassium dihydrogen phosphate (2.2.3) dissolved in water and transferred to Dilute to the mark with a 1 L volumetric flask (this buffer pH = 7). 2.2.15 Buffer B. Dissolve 55 g of sodium dihydrogen phosphate monohydrate (2.2.9) in 100 mL of water. 2.2.16 Wetting agent. 2.2.17 Hexavalent chromium standard stock solution (50.0mg/L). Accurately weigh 0.1414g of potassium dichromate that has been dried to a constant weight (105~110) °C (2.2.10), dissolved in water, and made up to 1000 mL, 1.00 mL of this solution contains 0.050 mg of hexavalent chromium. 2.2.18 Standard solution of hexavalent chromium (5.00mg/L). Pipette 10.0mL of hexavalent chromium standard stock solution (2.2.17) in 100mL capacity In a measuring flask, dilute to the mark with water, and 1.00 mL of this solution contains 0.00500 mg of hexavalent chromium. Now available. ......

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