GB/T 31270.2-2025Test guidelines on environmental safety assessment for chemical pesticides — Part 2: Hydrolysis test (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

This document is Part 2 of GB/T 31270 "Test Guidelines for Environmental Safety Evaluation of Chemical Pesticides". GB/T 31270 has been published. The following parts.

— Part 1: Soil metabolism test;

— Part 2: Hydrolysis test;

— Part 3: Photolysis test;

— Part 4: Soil adsorption/desorption test;

— Part 5: Soil leaching test;

— Part 6: Volatility test;

— Part 7: Bioconcentration test;

— Part 8: Water-sediment system metabolism test;

— Part 9: Short-term feeding toxicity test for birds;

— Part 10.Bee acute toxicity test;

— Part 11.Silkworm acute toxicity test;

— Part 12.Fish acute toxicity test;

— Part 13.Daphnia acute immobilization test;

— Part 14.Algal growth inhibition test;

— Part 15.Earthworm acute toxicity test;

— Part 16.Soil microbial toxicity test;

— Part 17.Acute toxicity test for natural enemy Trichogramma;

— Part 18.Acute toxicity test for natural enemies and amphibians;

— Part 19.Non-target plant impact test;

— Part 20.Short-term feeding toxicity test for livestock;

— Part 21.Toxicity test for large crustaceans;

— Part 22.Soil surface photolysis test;

— Part 23.Birds acute oral toxicity test.

This document replaces GB/T 31270.2-2014 "Test Guidelines for Environmental Safety Assessment of Chemical Pesticides Part 2: Hydrolysis Test" and Compared with GB/T 31270.2-2014, in addition to structural adjustments and editorial changes, the main technical changes are as follows.

a) The terms and definitions have been changed (see Chapter 3, Chapter 2 of the 2014 edition);

b) The requirements for reagents and materials have been changed (see Chapter 6, 4.1.2 of the 2014 edition);

c) The requirements for instruments and equipment have been changed (see Chapter 7, 4.1.3 of the 2014 edition);

d) The requirements for test substances have been changed (see 8.1, 4.1.1 of the 2014 edition);

e) The test steps have been changed (see Chapter 9, 4.2 of the 2014 edition);

f) The requirements for test data processing have been changed (see Chapter 10, 4.3 of the 2014 edition);

g) The quality control requirements have been changed (see Chapter 11, 4.4 of the 2014 edition);

h) Added the test flow chart (see Appendix B).

Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.

This document is proposed by the Ministry of Agriculture and Rural Affairs of the People's Republic of China.

This document is under the jurisdiction of the National Technical Committee on Pesticide Standardization (SAC/TC133).

This document was drafted by: Pesticide Control Institute, Ministry of Agriculture and Rural Affairs.

The main drafters of this document are: Shan Weili, Zhou Yanming, Tang Tao, Liu Xingang, Pan Hongji, Zhao Changsheng, Wu Min, Shi Kaiwei, Xu Zhenlan, Wu Qiong, Han Ping and Wang Xiaohuan.

The previous versions of this document and the documents it replaces are as follows.

— First published in 2014 as GB/T 31270.2-2014;

— This is the first revision.

Introduction

In order to reduce the impact of pesticide use on the ecological environment and provide data that meets the requirements of pesticide environmental risk assessment, it is necessary to carry out environmental safety assessment.

Tests are conducted to clarify the metabolism, degradation, adsorption, leaching, bioaccumulation and other characteristics of pesticides in the environment as well as their toxicity to non-target organisms.

GB/T 31270 "Guidelines for Environmental Safety Evaluation of Chemical Pesticides" is a test method standard for guiding the environmental safety evaluation of pesticides in China.

It is composed of 23 parts to standardize the pesticide environmental safety evaluation test work and improve the scientificity and comparability of pesticide environmental safety evaluation tests.

— Part 1: Soil metabolism test. The purpose is to clarify the metabolic pathways and metabolic rates of pesticides in soil.

— Part 2: Hydrolysis test. The purpose is to clarify the hydrolysis pathway and hydrolysis rate of pesticides.

— Part 3: Photolysis test. The purpose is to clarify the photolysis pathway and photolysis rate of pesticides.

— Part 4: Soil adsorption/desorption test. The purpose is to clarify the soil adsorption characteristics of pesticides.

— Part 5: Soil leaching test. The purpose is to clarify the leaching of pesticides.

— Part 6: Volatility test. The purpose is to clarify the volatility of pesticides.

— Part 7: Bioconcentration test. The purpose is to determine the bioconcentration of pesticides in fish.

— Part 8: Water-sediment system metabolism test. The purpose is to clarify the metabolic pathways and metabolism of pesticides in water-sediment systems. Thanks for the rate.

— Part 9: Short-term feeding toxicity test for birds. The purpose is to determine the short-term feeding toxicity of pesticides to birds.

— Part 10.Bee acute toxicity test. The purpose is to determine the acute toxicity of pesticides to bees.

— Part 11.Acute toxicity test to silkworm. The purpose is to determine the acute toxicity of pesticides to silkworm.

— Part 12.Fish acute toxicity test. The purpose is to determine the acute toxicity of pesticides to fish.

— Part 13.Daphnia acute activity inhibition test. The purpose is to determine the acute toxicity of pesticides to Daphnia.

— Part 14.Algal growth inhibition test. The purpose is to determine the toxicity of pesticides to algae.

— Part 15.Earthworm acute toxicity test. The purpose is to determine the acute toxicity of pesticides to earthworms.

— Part 16.Soil microbial toxicity test. The purpose is to clarify the toxicity of pesticides to soil microorganisms.

— Part 17.Acute toxicity test for natural enemy Trichogrammatis. The purpose is to clarify the toxicity of pesticides to Trichogrammatis.

— Part 18.Acute toxicity test for natural enemies and amphibians. The purpose is to clarify the acute toxicity of pesticides to amphibians.

— Part 19.Non-target plant effects test. The purpose is to clarify the toxicity of pesticides to non-target plants.

— Part 20.Short-term feeding toxicity test for livestock. The purpose is to clarify the feeding toxicity of pesticides to livestock.

— Part 21.Toxicity test to large crustaceans. The purpose is to determine the toxicity of pesticides to large crustaceans.

— Part 22.Soil surface photolysis test. The purpose is to clarify the photolysis pathway and photolysis rate of pesticides on the soil surface.

— Part 23.Bird acute oral toxicity test. The purpose is to determine the acute oral toxicity of pesticides to birds.

Test Guidelines for Environmental Safety Assessment of Chemical Pesticides Part 2: Hydrolysis test Warning. Personnel using this document should have practical experience in regular laboratory work. This document does not address all possible safety issues.

The user is responsible for taking appropriate safety and health measures and ensuring that the conditions stipulated by relevant national laws and regulations are met.

1 Scope

This document describes a test method for the hydrolysis testing of chemical pesticides.

This document applies to hydrolysis tests conducted for registration of chemical pesticides.

2 Normative references

GB/T 6682

NY/T 3150

3 Terms and Definitions

The following terms and definitions apply to this document.

4 Principles

Add the test substance to sterile buffer solutions of different pH values (pH 4, 7, 9), culture under constant temperature and dark conditions, and take samples for testing regularly.

The 50% degradation time (DT50) was calculated. The mass balance recovery rate of the test substance labeled with 14C was obtained and the main metabolites were identified.

It consists of multiple stages, and the experimental design of the next stage is determined based on the experimental results of the previous stage.

5 Test conditions

5.1 The hydrolysis test should be conducted under constant temperature and dark conditions. The temperature variation during the test should be controlled within at least ±0.5°C.

5.2 Measures such as passing He, N2 or Ar through the test solution for 5 minutes should be taken to avoid oxidation.

6 Reagents and Materials