GB/T 23870-2009 English PDF

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GB/T 23870-2009: Determination of Pb in propolis -- Microwave digestion -- Graphite furnace atomic absorption spectrophotometry
Status: Obsolete

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 23870-2009	399	Add to Cart	3 days	Determination of Pb in propolis -- Microwave digestion -- Graphite furnace atomic absorption spectrophotometry	Obsolete

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Basic data

Standard ID: GB/T 23870-2009 (GB/T23870-2009)
Description (Translated English): Determination of Pb in propolis -- Microwave digestion -- Graphite furnace atomic absorption spectrophotometry
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: X04
Classification of International Standard: 67.180.10
Word Count Estimation: 10,129
Date of Issue: 2009-05-26
Date of Implementation: 2009-09-01
Regulation (derived from): PRC National Standard Approval Announcement 2009 No.7 (Total No.147)
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 microwave digestion propolis lead content-Graphite furnace atomic absorption spectrophotometry detection methods. This standard applies to the determination of lead content in propolis. The lower limit of detection for the standard 0. 04 mg/kg.

GB/T 23870-2009: Determination of Pb in propolis -- Microwave digestion -- Graphite furnace atomic absorption spectrophotometry

---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 Pb in propolis Microwave digestion -. Graphite furnace atomic absorption spectrophotometry ICS 67.180.10 X04 National Standards of People's Republic of China Determination of lead in propolis Microwave digestion - graphite furnace atomic absorption spectrophotometry Posted 2009-05-26 2009-09-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

The Standard Appendix A, Appendix B is an informative annex. The standard proposed by China Federation of Supply and Marketing Cooperatives. This standard is under the jurisdiction of the national bee standardization working group. This standard was drafted. Nanjing University, Jiangsu Laoshan Biological Technology Co., People's Republic of China Jiangsu Entry-Exit Inspection and Quarantine Bureau, Bee Research Institute, Chinese Academy of Agricultural Sciences. The main drafters of this standard. Practicing Hong Zhen, Chen Kun, Wu Bin, Shen Tung Yuk, Chong Yu Shen, Ding Tao, Zhou Jinhui, Li Gonghai, Wang Peng. Determination of lead in propolis Microwave digestion - graphite furnace atomic absorption spectrophotometry

1 Scope

This standard specifies the quantity of lead in propolis microwave digestion - graphite furnace atomic absorption spectrometric detection. This standard applies to the determination of lead content in propolis. The standard detection limit of 0.04mg/kg.

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 6682 analytical laboratory use specifications and test methods (GB/T 6682-2008, ISO 3696. 1987, MOD) Preparation of standard solution of GB/T 602 Determination of impurities in chemical reagents

3 PRINCIPLE OF THE METHOD

Sample was added nitric acid and hydrogen peroxide, after microwave digestion, the absorbance was measured at 283.3nm. The measurement results with the standard Quantitative comparison of the series.

4 Reagents and materials

Unless otherwise noted, all reagents were of analytical grade water as a water GB/T 6682 regulations. 4.1 concentrated nitric acid. pure class distinctions. 4.2 Hydrogen peroxide (30%). 4.3 ammonium dihydrogen phosphate. 4.4 magnesium nitrate. 4.5 matrix modifier (a mixed solution of 1% ammonium dihydrogen phosphate and 0.06% magnesium nitrate). Weigh 1.000g take monoammonium phosphate and magnesium nitrate 0.060g, dissolved constant volume to 100mL. 4.6 2% nitric acid (1 + 50, volume ratio). 4.7 lead standard solution 4.7.1 Lead standard stock solution. according to GB/T 602 method of preparation, or to the nationally recognized standard material sales units later, thick quality Degree of 1mg/mL. Stored in a refrigerator at 4 ℃. Valid for six months. 4.7.2 Lead intermediate standard solution. take the lead standard stock solution (4.7.1) 2.00mL in 100mL flask, with 2% nitric acid (4.6) dilute Release volume, shake. This was the equivalent of 20.0μg 1mL lead. Stored in a refrigerator at 4 ℃. Valid for one month. 4.7.3 Lead standard solution. take the lead standard intermediate solution (4.7.2) with 2% nitric acid (4.6) diluted to 2ng/mL, 10ng/mL, 20ng/mL, 50ng/mL, 100ng/mL, 200ng/mL different concentrations. That day.

5 instruments and equipment

5.1 graphite furnace atomic absorption spectrophotometer. 5.2 Lead hollow cathode lamp. ......

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