毛细滴管计滴法同时测定水中硫酸根和总硬度  

Simultaneous determination of SO_4^(2-)and total hardness in water by counting the drops of capillary burette

作　　者：沈文闻[1] 

机构地区：[1]广西百色学院化学与生命科学系,广西百色533000

出　　处：《工业水处理》2008年第2期61-63,共3页Industrial Water Treatment

摘　　要：以自制的液滴体积为0.01～0.02 mL的聚乙烯毛细滴管同时测定水中硫酸根和总硬度,仪器外形小巧、便于携带,滴定快速、准确,试剂消耗量约为常量法的5%,滴定剂用量约为50～200滴,硫酸根含量不确定度为0.94%,与重量法相当,相对标准偏差比重量法的略小;水中总硬度不确定度为0.82%,效果也优于常量法。该法克服了常量法中滴定管、移液管、铁架台和蝴蝶夹等仪器携带不方便的不足,适用于工业用水现场和野外水质的快速分析。A drop counting analytical method used in simultaneous determination of the SO4^2- and total hardness in water by home-made polyethylene capillary burette of 0.01 - 0.02 mL per drop has been studied. The apparatus is mainly characterized by small in shape,convenient to be carried and fast and accurate in titration. The reagent consumption is about one twentieth of the ordinary method; the titrant dosage of it is only about 50-200 drops,the related expanded uncertainty of SO4^2- is about 0.94%,corresponding to that of gravimetric method. The relative error rsd （%） is a little smaller than that of gravimetric method. The related expanded uncertainty of total hardness in water is about 0.82%. The effect is superior to ordinary method. The method overcomes the inconvenience in carrying buret, pipet, buret support, buret holder in ordinary analysis, and is quite suitable for rapid analysis of industrial water quality on site and in field.

关 键 词：毛细滴管 微型滴定法 硬度 

分 类 号：X832[环境科学与工程—环境工程] O655.21[理学—分析化学]