无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2014, Vol. 46 ›› Issue (2): 47-.

• 论文 • 上一篇    下一篇

三聚磷酸钠水解及滴定法测量其含量

吴桂玲1,周骏宏1,卢玉莲1,尤彩霞2,孙成斌1,邢  焰1,刘品祯1   

  1. 1.黔南民族师范学院化学与化工系,贵州都匀 558000;2.河北化工医药职业技术学院
  • 出版日期:2014-02-10 发布日期:2014-01-24

Hydrolysis and content measurement of sodium tripolyphosphate by titration method

Wu Guiling1,Zhou Junhong1,Lu Yulian1,You Caixia2,Sun Chengbin1,Xing Yan1,Liu Pinzhen1   

  1. 1.Department of Chemistry and Chemical Engineering,Qiannan Normal College for Nationalities,Duyun 558000,China;
    2.Hebei Chemical Pharmaceutical Vocational and Technical College
  • Published:2014-02-10 Online:2014-01-24

摘要: 研究了常温下三聚磷酸钠在不加酸与加不同浓度硝酸的条件下,溶解放置后发生水解的情况,并对三聚磷酸钠在50 ℃条件下加热不同时间的水解情况做了考察。结果表明,溶液的pH减小和温度升高会使三聚磷酸钠的水解速率加快,其中温度是影响三聚磷酸钠水解的主要因素。同时,用滴定法测定了三聚磷酸钠的含量,样品加热沸腾25 min时三聚磷酸钠几乎完全水解,测得样品中三聚磷酸钠的质量分数为99.31%。

关键词: 三聚磷酸钠, 水解, 滴定法, 含量测定

Abstract: Conditions of the hydrolysis of sodium tripolyphosphate dissolved in different concentrations of nitric acid and without acid at room temperature were studied,and the situation of the hydrolysis of sodium tripolyphosphate at 50 ℃ with different heating times was investigated.The results showed that the rate of hydrolysis of sodium tripolyphosphate accelerated when the pH of the solution was reduced and the temperature elevated,and the temperature was the major influence factor on the hydrolysis of sodium tripolyphosphate.At the same time,the content of sodium tripolyphosphate was determined by titration method.Sodium tripolyphosphate was almost totally hydrolyzed when the sample was boiled for 25 min,and the content of sodium tripolyphosphate was 99.31%.

Key words: sodium tripolyphosphate, hydrolysis, titration method, determination of content

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