GB/T 43273-2023Determination of freeze/thaw stability for pesticides (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents" Drafting.

1 Scope

This document describes a method for determining the freeze-thaw stability of pesticides.

This document is applicable to freeze-thaw stabilization of microencapsulated suspensions, microencapsulated suspension-suspensions, microencapsulated suspensions-water emulsions and microencapsulated suspension-suspended emulsions in pesticides. Determination of sex.

2 Normative reference documents

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document.

GB/T 1601 Determination of pH value of pesticides

GB/T 14825 Method for determination of pesticide suspension rate

GB/T 16150 Method for determination of fineness of pesticide powders and wettable powders

GB/T 28135 Determination of acidity (alkalinity) of pesticides - Indicator method

GB/T 31737 Determination of Pesticide Pourability

3 Terms and definitions

There are no terms or definitions to be defined in this document.

4 General provisions

The sample size of the freeze-thaw test should be determined according to the specified test items after freeze-thaw, and sampling should be based on the characteristics of different dosage forms of products.

5 Principles

Through temperature adjustment, the samples are alternately frozen and melted to complete the measurement of the corresponding test items and test the stability of the pesticide encapsulated preparations. Qualitative.

6 Instruments and consumables

6.1 Freeze-thaw stability tester or thermostat. the temperature is controlled at (-10±2)°C and (20±2)°C.

6.2 Freeze-thaw test container. airtight container or original packaging of the product.