GB/T 6436-2018 in English
VALIDDetermination of calcium in feeds
- Issued on:2015-05-14
- Implemented on:2018-12-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$117.00
《GB/T 6436-2018饲料中钙的测定》由TC76（全国饲料工业标准化技术委员会）归口，主管部门为国家标准化管理委员会。
Introduction
GB/T 6436—2018 Standard Overview
GB/T 6436—2018 "Determination of Calcium in Feed" is a national standard of the People's Republic of China, which is used to regulate the detection method of calcium content in feed. This standard replaces the old version GB/T 6436—2002 and introduces more precise technical requirements and detection methods.
Background of Standard Revision and Technological Evolution
| Old version of the standard | New version of the standard | Main improvements |
|---|---|---|
| The scope of application has been modified | The scope of use has been refined and it is clearly applicable to various types of feed products | The detection scope has been expanded |
| The quantitative limit has not been clarified | The quantitative limit of calcium has been added (0.05%) | New technical indicators have been added |
| The sampling and sample preparation methods are relatively simple | The sampling and sample preparation processes have been optimized | The detection efficiency has been improved |
Analysis of calcium content determination method
This standard provides two main determination methods: potassium permanganate method and disodium ethylenediaminetetraacetic acid complexometric titration method.
Principle and steps of potassium permanganate method
- potassium permanganate standard solution is used to oxidize calcium oxalate, and the calcium content is determined by titration reaction.
- The sample is dissolved in nitric acid and hydrochloric acid solution after high temperature burning.
- Calcium ions are precipitated by ammonium oxalate and then titrated with potassium permanganate solution.
Principle and steps of ethylenediaminetetraacetic acid complexometric titration method
- Calcium ions are complexed with disodium ethylenediaminetetraacetic acid, and the end point is determined by the color change of the indicator.
- Suitable for rapid determination, especially for samples with high calcium content.
- The pH value and the influence of interfering ions must be strictly controlled during the reagent preparation and titration process.
Implementation suggestions
In order to ensure the accuracy of the test results, it is recommended that:
- The laboratory should be equipped with instruments such as high-precision analytical balances and high-temperature furnaces.
- Operators must undergo professional training and be familiar with the technical details of the two methods.
- Regularly calibrate reagents and instruments to ensure data reliability.
- For complex samples (such as feed containing high organic matter), it is recommended to give priority to the ethylenediaminetetraacetic acid method.
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