GB/T 43167-2023 (English Version)

Standard No.: GB/T 43167-2023
Language: Chinese, Available in English version
Release Date: 2023
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 43167-2023

Scope: This document specifies the technical requirements for standard hard water for pesticide testing, describes the preparation method of standard hard water for pesticides and the determination method of total hardness. This document is applicable to the quality control of standard hard water for pesticides.

Introduction

Technical requirements for standard hard water for pesticide testing

Comparison of standard hard water classification and technical indicators
Item	Standard hard water A	Standard hard water B	Standard hard water C	Standard hard water D
Total hardness/(mg/L)	20±3	20±3	500±25	342±17
Molar ratio of calcium and magnesium ions	1:1	4:1	4:1	4:1
pH range	5.0~6.0	8.0~9.0	7.0~8.0	6.0~7.0

Application background and technical evolution analysis of standard hard water

Standard hard water for pesticide testing plays an important role in the agrochemical industry. It is mainly used to calibrate instruments, prepare reagents and verify the accuracy of test methods. With the advancement of pesticide residue detection technology, the technical requirements for standard hard water are gradually increasing.

The significance of total hardness determination

Total hardness is an important indicator for measuring the content of calcium and magnesium compounds in standard hard water, which directly affects the accuracy of pesticide detection results. This standard specifies four different types of standard hard water, which are suitable for the needs of different detection scenarios.

Practical application of the molar ratio of calcium and magnesium ions

The ratio of calcium and magnesium ions not only affects the preparation method of standard hard water, but is also closely related to the compatibility of the detection system. For example, when preparing standard hard water B, the calcium-magnesium ratio is 4:1, which has unique advantages in specific pesticide detection methods.

GB/T 43167-2023 Referenced Document

GB/T 601 Chemical reagent.Preparations of reference titration solutions
GB/T 603 Preparation of preparations and products used in chemical reagent test methods

GB/T 43167-2023 history

2023 GB/T 43167-2023 Standard hard water for pesticide testing