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Study on the Production of Reference Material of Heavy Metals (As, Cd, Pb, Hg) in Water

Le Thi Phuong Thao Nguyen Thi Hang Tran Thi Hong Nguyen Minh Chau
Published 03/09/2022

Article Details

How to Cite
Le Thi Phuong Thao, Nguyen Thi Hang, Tran Thi Hong, Nguyen Minh Chau. "Study on the Production of Reference Material of Heavy Metals (As, Cd, Pb, Hg) in Water". Vietnam Journal of Food Control. vol. 5, no. 1, pp. 37-46, 2022
PP
37-46
Counter
428

Main Article Content

Abstract

Reference materials are an important tool in ensuring the validity of testing results. The use of standard materials in Vietnam is currently limited because the supply depends on foreign standard material manufacturers at a high cost, and there is no domestic manufacturer for water and food reference materials production. This study aims to provide a procedure reference materials production for heavy metals Pb, Cd, As, and Hg analysis in water. The reference materials were homogenized and stable for a period of 318 days from the date of manufacture. With the assigned values consistent with the concentration to be analyzed of the heavy metals in the normal water sample. The measurement uncertainty ranges from 7.0 to 21.7 %. These reference materials can be used for internal quality control for laboratories. The research provides a standard procedure for the following production times for reference materials for heavy metal analysis in water and also a premise for further research on standard samples with matrix and other analytical criteria.

Keywords:

Reference material, reference material production, water, heavy metal.

References

[1]. TCVN ISO/IEC 17025:2017, Yêu cầu chung về năng lực của phòng thử nghiệm và hiệu chuẩn.
[2]. ISO 17034:2016, General requirements for the competence of reference material producers
[3]. QCVN 6-1:2010/BYT, Quy chuẩn kỹ thuật quốc gia đối với nước khoáng thiên nhiên và nước uống đóng chai.
[4]. Standard Methods for the Examination of Water and Wastewater 3125B, 2017.
[5]. QCVN 12-1:2011/BYT Quy chuẩn kỹ thuật quốc gia về an toàn vệ sinh đối với bao bì, dụng cụ tiếp xúc trực tiếp với thực phẩm bằng nhựa tổng hợp.
[6]. TCVN 6663-3:2008 (ISO 5667-3:2003) về Chất lượng nước - Lấy mẫu - Phần 3: Hướng dẫn bảo quản và xử lý mẫu.
[7]. ISO GUIDE 80:2014, Guidance for the in-house preparation of quality control materials (QCMs).
[8]. ISO Guide 35:2017, Reference materials - Guidance for characterization and assessment of homogeneity and stability.
[9]. ISO 13528:2015, Statistical methods for use in proficiency testing by interlaboratory comparison.

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