GB/T 7686-2016 English PDFUS$279.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 7686-2016: General method for determination of arsenic content of chemical products Status: Valid GB/T 7686: Historical versions
Basic dataStandard ID: GB/T 7686-2016 (GB/T7686-2016)Description (Translated English): General method for determination of arsenic content of chemical products Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: G04 Classification of International Standard: 71.040.40 Word Count Estimation: 14,186 Date of Issue: 2016-12-13 Date of Implementation: 2017-07-01 Older Standard (superseded by this standard): GB/T 7686-2008 Regulation (derived from): National Standard Announcement No.73 of 2016 Issuing agency(ies): General Administration of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 GB/T 7686-2016: General method for determination of arsenic content of chemical products---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.General method for determination of arsenic content of chemical products ICS 71.040.40 G04 National Standards of People's Republic of China Replacing GB/T 7686-2008 A General Method for Determination of Arsenic in Chemical Products 2016-12-13 released 2017-07-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China China National Standardization Management Committee released ForewordThis standard is drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 7686-2008 "General method for determination of arsenic in chemical products", compared with GB/T 7686-2008 To change as follows. - Ag (DDTC) trichloromethane solution is added as an absorption solution for silver diethyldithiocarbamate (see 3.3, 2008 edition 3.2); - increased atomic fluorescence spectroscopy (see Chapter 4); - delete the original standard Appendix A, the original standard Appendix B to Appendix A, Appendix C to Appendix B, Appendix D to Appendix C, an informative Appendix D (see Appendix A to Appendix D, Appendix A to Appendix D of the.2008 edition). This standard is proposed by the China Petroleum and Chemical Industry Association. This standard is under the jurisdiction of the National Committee for the Standardization of Sulfuric Acid and Sulfuric Acid (SAC/TC63/SC7). The drafting unit of this standard. Nanhua Group Research Institute, Yunnan Province Product Quality Supervision and Inspection Research Institute, Shandong Province Product Quality Inspection Research Institute, Jilin Jien Nickel Industry Co., Ltd. The main drafters of this standard. Qiu Ailing, He Dehong, Feng Junting, Du Bohui, Zhu Yanfeng, Li Shaohua. This standard replaced the previous version of the standard release. --- GB/T 7686-1987, GB/T 7686-2008. A General Method for Determination of Arsenic in Chemical Products WARNING - Some of the reagents used in this standard are toxic or corrosive and are partially hazardous. This standard is not disclosed Possible security issues, the user should be in strict accordance with the relevant provisions of the correct use, and the responsibility to take appropriate safety and health measures.1 ScopeThis standard specifies a general method for the determination of arsenic in chemical products. The silver diethyldithiocarbamate photometric method in this standard is suitable for the determination of arsenic in the range of 1μg ~ 20μg. The sub-fluorescence spectrophotometry is suitable for the determination of arsenic in the range of 0.005μg ~ 2.5μg.2 normative reference documentsThe following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this article Pieces. For undated references, the latest edition (including all modifications) applies to this document. GB/T 602 Preparation of standard solutions for the determination of impurities in chemical reagents GB/T 6682 Analytical laboratory water specifications and test methods3 silver dimethyldithiocarbamate photometric method3.1 Principles In the hydrochloric acid medium, arsenic is reduced with zinc to form arsine, and silver diethyldithiocarbamate [Ag (DDTC)] pyridine or trichloride Methane solution, the formation of purple soluble silver colloidal silver, at the maximum absorption wavelength of 540nm, the absorbance of its measurement. The reaction formula for the formation of colloidal silver is. AsH3 6Ag (DDTC) = 6Ag 3H (DDTC) As (DDTC) 3 3.2 General provisions The reagents and water used in the present method, when not otherwise specified, refer to the analytical reagent and the three reagents that meet the requirements of GB/T 6682 Water level. All reagents, especially zinc particles, should not contain arsenic or only a very small amount of arsenic. 3.3 Reagents and materials 3.3.1 Hydrochloric acid. 3.3.2 zinc particles. particle size of 0.5mm ~ 1mm. If other forms of zinc, should be experimentally proven, under the specified test conditions (see attached) Recorded A) can give the same result. 3.3.3 Absorbent Solution A. Diethyldithiocarbamate solution [abbreviated as Ag (DDTC) pyridine solution], 5g/L. Dissolve 1 g of silver diethyldithiocarbamate in pyridine (density about 0.980 g/mL) and dilute to.200 mL with pyridine and store Sealed brown glass bottle, to avoid light exposure, valid for two weeks. For the purification of silver diethyldithiocarbamate, see Appendix B. 3.3.4 Absorbent liquid B. Diethyldithiocarbamate trichloromethane solution [abbreviated as Ag (DDTC) trichloromethane solution], 2.5 g/L. Weigh 0.25 g of silver diethyldithiocarbamate, and then rinsed with an appropriate amount of chloroform. Add 1.0 mL of triethanolamine, and then use ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 7686-2016_English be delivered?Answer: Upon your order, we will start to translate GB/T 7686-2016_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 7686-2016_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 7686-2016_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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