高等学校化学学报 ›› 1988, Vol. 9 ›› Issue (10): 1080-1082.

• 论文 • 上一篇    下一篇

速差动力学比例方程法同时测定微量磷砷

字明显, 刘海澜, 赵青岚   

  1. 河南大学化学系
  • 收稿日期:1987-04-22 出版日期:1988-10-24 发布日期:1988-10-24
  • 通讯作者: 字明显

Simultaneous Differential Reaction-Rate Determination of Micro Phosphorus and Arsenic by the Method of Proportional Equations

Zi Mingxian, Liu Hailan, Zhao Qinglan   

  1. Department of Chemistry, Henan University, Kaifeng
  • Received:1987-04-22 Online:1988-10-24 Published:1988-10-24

摘要: 文献报道的磷砷测定,需分两步进行[1~3]。作者在实验中发现,磷砷(Ⅴ)与钼酸铵及抗坏血酸作用,形成两种具有相似吸光特性的钼蓝,但生成速率常数有差异。据此,本文提出了用比例方程法[4]同时测定两组分的含量。

关键词: 速差动力学法, 比例方程法, 微量磷砷的测定

Abstract: The article describes a method of simultaneous determination of micro phosphorus and arsenic by differential reaction-rate method. The proportional coefficients of K3min(P),K3min(As), K9min(P) and K9min(As) in solutions containing 0.3755mol·L-1 of sulphuric acid and 0.4% ammonium molybdate at 65℃ are reported. The method described is suitable for simultaneous determination of phosphorus and arsenic in a ratio of (P:As) more than 1.5. The relative error and relative standard deviation are within 1.0%.

Key words: Differential reaction-rate method, A method of proportional equation, Determination of micro phosphorous and arsenic