GB/T 9726-2007Chemical reagent -- General rule for the determination of permanganate-reducing substances (English PDF)

Foreword

This standard and ISO 6353-1. 1982 "Reagents for chemical analysis - Part 1. General test method" non-equivalent.

This standard replaces GB/T 9726-1988 "chemical reagents potassium permanganate reducing substances determination Law", and GB/T 9726-1988 phase Than the main changes are as follows.

--- Modify the contents of the principle of the method (see Chapter 3);

--- Cancel the 1988 edition of Appendix B.

Appendix A of this standard is an informative annex.

The standard proposed by China Petroleum and Chemical Industry Association.

This standard by the National Standardization Technical Committee Chemistry Chemicals Branch (SAC/TC63/SC3) centralized.

This standard was drafted. Guangdong Guanghua Chemical Factory Co., Ltd.

1 Scope

This standard specifies the direct method (visual colorimetric method) and indirect methods (titration analysis) Determination of permanganate reducing substances in the general method.

This standard applies to the direct method neutral alcohols, ketones, or other neutral, weakly alkaline reduction test sample containing substances of low potassium permanganate Set; indirect method for sample reaction to restore higher levels of potassium permanganate, potassium permanganate reducing substance or substances in the sample than with potassium permanganate Determination difficult performed.

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.

Preparation of GB/T 601 chemical reagent standard titration solution GB/T 603 chemical reagent test method Preparations of articles (GB/T 603-2002, ISO 6353-1 with. 1982, NEQ) GB/T 6682 analytical laboratory use specifications and test methods (GB/T 6682-1992, neq ISO 3696. 1987)

3 PRINCIPLE OF THE METHOD

Under certain conditions, the test solution of potassium permanganate reducing substances can react with potassium permanganate, so that the test solution fade.

4 Reagents and materials

Unless otherwise specified, the standard titration solution, preparations and products, according to GB/T 601, the provisions of the preparation of GB/T 603, the test water shall comply with GB/T 6682 water in three specifications, are used in the mass fraction solution "%" represents.

5 Instruments and devices

5.1 General laboratory equipment.

5.2 microburette.

6 Determination