Estimation of measurement uncertainty of coliforms in drinking water according to ISO 19036 :2019

Authors

ZHONG Wentao, Hunan Provincial Institute of Product and Commodity Goods Quality Inspection , Changsha , Hunan 410007 , China;Hunan Provincial Key Laboratory of Food Safety Monitoring and Early Warning , Changsha , Hunan 410007 , China
LU Lin, Hunan Provincial Institute of Product and Commodity Goods Quality Inspection , Changsha , Hunan 410007 , China;Hunan Provincial Key Laboratory of Food Safety Monitoring and Early Warning , Changsha , Hunan 410007 , China
LI Zheng, Hunan Provincial Institute of Product and Commodity Goods Quality Inspection , Changsha , Hunan 410007 , China
ZHOU Peihua, Hunan Provincial Institute of Product and Commodity Goods Quality Inspection , Changsha , Hunan 410007 , China;Hunan Provincial Key Laboratory of Food Safety Monitoring and Early Warning , Changsha , Hunan 410007 , China
HONG Zhenbai, Hunan Provincial Institute of Product and Commodity Goods Quality Inspection , Changsha , Hunan 410007 , China;Hunan Provincial Key Laboratory of Food Safety Monitoring and Early Warning , Changsha , Hunan 410007 , China
ZHOU Cong, Hunan Provincial Institute of Product and Commodity Goods Quality Inspection , Changsha , Hunan 410007 , China;Hunan Provincial Key Laboratory of Food Safety Monitoring and Early Warning , Changsha , Hunan 410007 , ChinaFollow

Corresponding Author(s)

周丛（1978—），男，湖南省产商品质量检验研究院正高级工程师，硕士。E-mail：3489785@qq.com

Abstract

［［Objective ］］ This study aimed to estimate the measurement uncertainty of coliforms in drinking water according to ISO 19036:2019.［［Methods ］］ By designing protocols,the technical uncertainty (utech),matrix uncertainty (umatrix) and distribution uncertainty (udistrib) were estimated respectively,and the combined uncertainty (uc(y)) and extended uncertainty (U) were calculated by combining the values of the three components.［［Results］］ After estimating the measurement uncertainty of the second method of GB 4789.3—2016,the technical uncertainty was 0.120 2 log（CFU/mL）,the matrix uncertainty was 0.1 log（CFU/mL）,and the distribution uncertainty was 0.065 5 log（CFU/mL） and 0.026 1 log（CFU/mL）.When the result was 440 CFU/mL,the extended uncertainty was 0.34 log（CFU/mL）,expressed as （2.64±0.34） log（CFU/mL）.［［Conclusion ］］ According to ISO 19036:2019,the estimation of measurement uncertainty for quantitative determinations of microorganisms in food is more scientific and convenient compared to current domestic standards.

Publication Date

2-18-2025

First Page

68

Last Page

72

DOI

10.13652/j.spjx.1003.5788.2024.80113

Recommended Citation

Wentao, ZHONG; Lin, LU; Zheng, LI; Peihua, ZHOU; Zhenbai, HONG; and Cong, ZHOU (2025) "Estimation of measurement uncertainty of coliforms in drinking water according to ISO 19036 :2019," Food and Machinery: Vol. 40: Iss. 10, Article 10.
DOI: 10.13652/j.spjx.1003.5788.2024.80113
Available at: https://www.ifoodmm.cn/journal/vol40/iss10/10

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