SN/T 1766.2-2006Determination of pesticide residues in greasy wool. Part 2: Determination of organochlorines and synthetic pyrethroids pesticide residues. Gas chromatography (English PDF)

Foreword

SN/T 1766 "Determination of Pesticide Residues in Fat-Free Wool" is divided into three parts.

--- Part 1. Determination of organophosphorus pesticides - Gas chromatography;

--- Part 2. Determination of organochlorine and pyrethroid pesticides by gas chromatography;

--- Part 3. Determination of diflubenzuron and triflumuron by high performance liquid chromatography.

This part is the second part of SN/T 1766.

Appendix A of this section is an informative annex.

This part is proposed and managed by the National Certification and Accreditation Administration.

This section drafted by. Shanghai Entry-Exit Inspection and Quarantine Bureau of the People's Republic of China.

Drafters of this section. Jiang Haining, Wu Xiongying, Yang Juan, Fei Xudong, Tang Minfeng, Shi Li.

This section is the first industry standard for entry-exit inspection and quarantine.

Determination of pesticide residues in fat-containing wool Part 2. Organochlorine and fitting pyrethroid pesticides Determination of gas chromatography WARNING. Certain reagents and equipment used during operation may be harmful to humans. Please take appropriate measures.

1 Scope

This part of SN/T 1766 specifies the determination of alpha-hexachlorocyclohexane, hexachlorobenzene (HCB) and beta-hexachlorocyclohexane in fat-containing wool by gas chromatography.

(lambda-cyhalothrin), cypermethrin, fenvalerate, deltamethrin, chlorofluorocarbon an organic chlorine such as flumethrin and a method of fitting a multiresidue to a pyrethroid pesticide.

This section applies to the determination of the above 15 organochlorines and 5 pyrethroid pesticide residues in fat-containing wool.

2 Normative references

The provisions in the following documents become the provisions of this part by reference to this part of SN/T 1766. Any dated reference document, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, parties that have reached an agreement under this section are encouraged.

Study whether the latest versions of these files are available. For undated references, the latest edition applies to this section.

SN/T 0473 Import and export of fat-containing wool inspection procedures

3 Method summary

The sample was extracted with n-hexane-diethyl ether mixed solvent, and the extract was extracted with methanol, neutral alumina solid phase extraction column and Florisil solid.

The phase extraction column was purified and chromatographed using a gas chromatograph equipped with an electron capture detector and quantified by an external standard method.

4 Reagents and materials

4.1 Methanol. pesticide residue level.

4.2 Acetone. chromatographically pure.

4.3 Ethyl acetate. chromatographically pure.

4.4 Hexane. Chromatographically pure.

4.5 Mixed solvent of n-hexane and diethyl ether (volume ratio 2.1). Prepared by chromatography or analytically pure n-hexane and analytically pure diethyl ether.

4.6 Mixed solvent of n-hexane and ethyl acetate (95.5 by volume). Prepared by chromatography of pure n-hexane and chromatographically pure ethyl acetate.

4.7 Reference materials.

--- Hexachlorobenzene (HCB) standard. purity >= 99.6%;

---gamma-hexachlorocyclohexane (lindane) standard. purity >=99.7%;

--- Heptachlor (Heptachlor) standard. purity >= 99.0%;

--- Aldrin (aldrin) standard. purity >= 99.0%;