摘要
余氯是水质监测的一个重要指标,是评判水质好坏的重要参数。为此,研制了国家二级总余氯标准物质GBW(E)084725、GBW(E)084726。针对常用的总余氯测量方法,从中选取适合标准物质定值的测试方法,并对测试方法进行方法学研究。分别对2种浓度总余氯标准物质进行了均匀性和稳定性检验。方差检验F值均小于列表临界值,表明该标准物质均匀性良好。在6个月的稳定性考察期内,2种含量的标准物质在统计学上无明显变化,进行10天短期高低温模拟实验,2种含量的标准物质在统计学上也无明显变化,说明2种标准物质稳定性良好。采用氧化还原滴定法进行标准物质定值,量值分别为50 mg/L和500 mg/L,相对扩展不确定度分别为0.9%和0.5%。
Residual chlorine is an important indicator for water quality monitoring and an important parameter for judging water quality.For this reason,the national second-class total residual chlorine reference materials GBW(E)084725,GBW(E)084726 were developed.According to the commonly used measurement methods of total residual chlorine,the method suitable for the calibration of reference materials was selected,and the methodology of the calibration method was studied.The homogeneity and stability of total residual chlorine reference materials with two concentrations were tested respectively.The F value of variance test was less than the critical value,indicating that the homogeneity of the reference material was good.During the six month stability investigation period,there was no statistically significant change in the reference materials with two contents.At the same time,ten day short-term high and low temperature simulation experiments were conducted.The results showed that there was no significant change statistically in the reference materials with two contents either,which indicated the stability of the two reference materials was good.The redox titration method was used for the determination of reference materials.The quantity values were 50 mg/L and 500 mg/L respectively,and the relative expanded uncertainty was 0.9%and 0.5%(k=2)respectively.
作者
龚维
姚旭霞
田平
吕辉
刘新
GONG Wei;YAO Xu-xia;TIAN Ping;L Hui;LIU Xin(Shandong Non-metallic Materials Institue,Jinan,Shandong 250031,China)
出处
《计量学报》
CSCD
北大核心
2023年第12期1912-1918,共7页
Acta Metrologica Sinica
关键词
标准物质
总余氯
水质监测
氧化还原滴定法
不确定度
reference material
total residual chlorine
water quality monitoring
redox titration method
uncertainty
