GB/T 44969-2024Metal ions removal in water soluble extracts of agricultural products—Ion exchange method (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 is required.

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 and coordinated by the China National Institute of Standardization.

This document was drafted by: China National Institute of Standardization, Institute of Process Engineering, Chinese Academy of Sciences, Shenzhen Analysis and Testing Association, Lanzhou Institute of Chemical Physics, Shenzhen Yirui Biotechnology Co., Ltd., Zhejiang Tiancao Biotechnology Co., Ltd., Guangdong Yifang Pharmaceutical Co., Ltd., Zhejiang University, Beijing Forestry University, Nanjing University of Science and Technology, Nanjing University, Erlian Customs Technology Center, Beijing Institute of Analysis and Testing, Institute of Science and Technology, Jiangsu Institute of Quality and Standardization, Nanjing Zhongke Pharmaceutical Co., Ltd., Hanzhong Natural Valley Biotechnology Co., Ltd. Wu Technology Co., Ltd.

The main drafters of this document are: Xi Xingjun, Lan Tao, Zhan Songkun, Wang Jing, Ouyang Jing, Zhang Guifeng, Pei Dong, Cheng Yong, Sun Dongmei, Yan Weidong, Yu Congcong, Meng Lingling, Ding Hui, Li Guowei, Feng Peng, Zhou Yajie, Lei Jiandu, Wang Fenghe, Liu Fuqiang, Wang Wei, Wang Bingzhi, Wang Ping.

Metal ions in water-soluble extracts of agricultural products Elimination method. ion exchange

1 Scope

This document describes an ion exchange method for the elimination of metal ions from water-soluble plant extracts of agricultural products.

This document applies to lead (Pb2), cadmium (Cd2), mercury (Hg2), arsenic in water-soluble plant extracts of agricultural products such as polysaccharides and polyphenols.

It is suitable for the elimination of major metal ions (AsO33) and free cations of harmful elements, but not for the elimination of free cations with carboxyl (-COOH) and chloride ions (Cl-).

The anionic extract samples were used for reference in large-scale processing.

2 Normative references

GB 5009.11

GB 5009.12

GB 5009.15

GB 5009.17

GB 5009.268

GB/T 5475

GB/T 6682

GB/T 13659

GB/T 16579

3 Terms and definitions

There are no terms or definitions that require definition in this document.

4 Principle

The water-soluble plant extract samples of agricultural products were dissolved in water, mixed and filtered, and the filtrate was passed through a strong acid cation exchange resin column.

The H in the resin reacts with the four harmful elements of lead (Pb2), cadmium (Cd2), mercury (Hg2), and arsenic (AsO33) in the filtrate.

Exchange, and finally rinse with water to complete the elimination process of metal ions.

5 Reagents and Materials

Unless otherwise specified, only analytical grade reagents were used and the water was grade 2 water as specified in GB/T 6682.