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SN/T 3958-2014 English PDF

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SN/T 3958-2014: Determination of total arsenic, lead, cadmium, copper content in plant extracts for import and export
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SN/T 3958-2014English319 Add to Cart 3 days [Need to translate] Determination of total arsenic, lead, cadmium, copper content in plant extracts for import and export Valid SN/T 3958-2014

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Basic data

Standard ID SN/T 3958-2014 (SN/T3958-2014)
Description (Translated English) Determination of total arsenic, lead, cadmium, copper content in plant extracts for import and export
Sector / Industry Commodity Inspection Standard (Recommended)
Classification of Chinese Standard X04
Classification of International Standard 67.050
Word Count Estimation 12,130
Date of Issue 4/9/2014
Date of Implementation 11/1/2014
Quoted Standard GB/T 602; GB/T 6682
Regulation (derived from) State inspection certification (2014) 210
Issuing agency(ies) General Administration of Customs
Summary This standard specifies the total arsenic, lead, cadmium, copper content determination of import and export plant extract. This standard applies to the import and export of plant material powders Determination of total arsenic, lead, cadmium, copper conte

SN/T 3958-2014: Determination of total arsenic, lead, cadmium, copper content in plant extracts for import and export


---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.
(Total arsenic, lead, cadmium, copper content determination of the import and export of plant extracts) People's Republic of China Entry-Exit Inspection and Quarantine Standards The total import and export plant extract arsenic, lead, cadmium, copper Content Measurement Determinationoftotalarsenic, lead, cadmium, coppercontentin Issued on. 2014-04-09 2014-11-01 implementation People's Republic of China The State Administration of Quality Supervision, Inspection and Quarantine released

Foreword

This standard was drafted in accordance with GB/T 1.1-2009 given rules. This standard is proposed and managed by the National Certification and Accreditation Administration Committee. This standard was drafted. People's Republic of China Hunan Exit Inspection and Quarantine. The main drafters of this standard. Chenxin Huan, Huang Zhiqiang, Chen training, Huang Ping, OF SCIENTIFIC Yang Wanbiao, bears Fang, Hu Yudong, Lu small garden. The total import and export plant extract arsenic, lead, cadmium, copper Content Measurement

1 Scope

This standard specifies the total arsenic, lead, cadmium, copper content determination of import and export plant extract. This standard applies to the import and export of plant material powders Determination of total arsenic, lead, cadmium, copper content extraction.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein Member. For undated references, the latest edition (including any amendments) applies to this document. Preparation of standard solution of GB/T 602 Determination of impurities in chemical reagents Laboratory use specifications and test methods GB/T 6682 Analysis

3 Determination of total arsenic

3.1 Method summary After acid digestion of the sample was added thiourea pentavalent arsenic reduced to trivalent arsenic, then add sodium borohydride or potassium borohydride reduction it generates arsine Hydrogen, argon loaded by quartz atomizer decomposed into arsenic atom, atomic fluorescence emission generated special arsenic hollow cathode lamps light excitation, Fluorescence intensity under conditions of an arsenic concentration in the solution to be tested is proportional to the standard series of quantitative comparison. 3.2 Reagents and materials Unless otherwise indicated in the analysis using only analytical reagents, test water should be consistent with GB/T 6682 provisions of secondary water requirements. 3.2.1 Nitric acid. pure class distinctions. 3.2.2 sulfuric acid. pure class distinctions. 3.2.3 perchloric acid. pure class distinctions. 3.2.4 Thiourea (50g/L) - ascorbic acid (50g/L) mixed solution. Weigh thiourea 5.0g, ascorbic acid 5.0g, dissolved in purified water, and water Diluted to 100mL, using now. 3.2.5 sulfuric acid solution. 595. 3.2.6 sodium hydroxide solution. 2g/L. 3.2.7 Sodium borohydride (of NaBH4) solution. 10g/L, sodium borohydride weighed 10.0g, dissolved in 1000mL sodium hydroxide solution (3.2.6), and Mix well. 14d can be stored at 0 ℃ ~ 5 ℃. 3.2.8 arsenic standard stock solution. 1000μg/mL, buy certified standard solution or by GB/T 602 provisions prepared. At 0 ℃ ~ 5 ℃ can Stored for 6 months. 3.2.9 use arsenic standard solution. arsenic standard stock solution (3.2.8) (3.2.5) stepwise with diluted sulfuric acid solution, formulated as 0.50μg/mL standard Standard solution. It can be stored at 0 ℃ ~ 5 ℃ 1 month. 3.3 instruments and equipment 3.3.1 atomic fluorescence spectrometer.

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