Determination of Total Hardness in Water by Air-Segmented Continuous Flow Analysis / 环境与健康杂志

0.999 0, and RSDs were not more than 3.26%. The recovery rates were 94.12%-104.30% .The lowest detected concentration was 1.43 mg/L. There was no significant difference between the results of this method and Na2EDTA titration. Conclusion The method was rapid, accurate and highly sensitive.