摘要
水质硬度是环境监测的常规项目,对于饮用水安全以及工业用水利用都有重要的影响。空白样品(稀释时所用蒸馏水)使用的三级蒸馏水会有少量的钙、镁离子,但标准《水质钙和镁总量的测定EDTA滴定法》(GB 7477—87)的计算方法中,未考虑空白值对结果的影响。通过实验论证了水质总硬度的测定不能忽略空白样品对测定结果的影响,并提出了基于空白值因子影响的总硬度修正模型。该方法适用于地下水和地表水,能在符合标准要求的前提下提高检测结果的准确性。
The hardness of water quality is a routine item in environmental monitoring,which has an important impact on the safety of drinking water and the use of industrial water resources.The third level distilled water used in the blank sample(diluted with distilled water)may contain a small amount of calcium and magnesium ions,but the calculation method in the standard"Water Quality-Determination of Total Calcium and Magnesium-EDTA Titration Method"(GB 7477—87)does not consider the impact of blank values on the results.It was demonstrated through experiments that the determination of total hardness of water quality cannot ignore the influence of blank samples on the measurement results,and a total hardness correction model based on the influence of blank value factors was proposed.This method is applicable to groundwater and surface water,and can improve the accuracy of detection results in advance of meeting standard requirements.
作者
李媛
刘晓
李晓彤
Li Yuan;Liu Xiao;Li Xiaotong(Technology Inspection Center of Shengli Oilfield,Dongying 257045,China;Shengli Chemical Co.,Ltd.of Shengli Oilfield,Dongying 257055,China)
出处
《山东化工》
CAS
2024年第1期166-168,172,共4页
Shandong Chemical Industry
关键词
总硬度
空白
修正模型
准确性
total hardness
blank sample
value correction model
accuracy
