Uncertainty in the Determination of Hardness in Water
- VernacularTitle:水中总硬度测定的不确定度评定
- Author:
Xiang CHEN
;
Longbiao YANG
- Publication Type:Journal Article
- Keywords:
Water;
Quality control;
Uncertainty
- From:
Journal of Environment and Health
1992;0(04):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective To explore the methods for the evaluation of the uncertainty of the determination of hardness in water. Methods A certain water sample was analyzed for the hardness according to EDTA-Na2 volumetry ruled by the Sanitory Standard for Drinking Water(2001).The mathematical model of the determination of hardness in water was established based on JJF1059-1999. The variance composition of the relative uncertainty was analyzed. The procedure of the evaluation of every uncertainty component was described in detail. Results The hardness in the water sample was 137 mg/L calculated according to mathematical model established in this study. The relative uncertainty and the expand uncertainty of the detection of hardness in the water sample were 0.008, 3 mg/L respectively. The expression of the uncertainty in the determination of hardness was (137?3)mg/L. Conclusion This method presented referable value for the evaluation of the uncertainty of volumetry determination method of hardness in water.
