双波长光度法测定电镀铬溶液中Cr^(6+)和Cr^(3+)含量的研究

Study on the Measurement of Content of Cr^(6+) and Cr^(3+) in the Electrochromiuming Solution by Double-waveleanth Photometric Method

利用Cr6+ 和Cr3 + 自身的颜色 ,寻找了双波长分光光度法测定各自含量时的测量波长和参比波长 ,研究了酸度、干扰离子以及线性范围等测量条件 ,确定了相应的测量方法。实验结果表明 :在强碱性介质中 ,Cr6+ 和Cr3 + 分别在 0～ 2 .5× 10 -4mol/L和 0～ 2 .0× 10 -2 mol/L具有很好的线性关系 。

Using the colour of Cr 6+ and Cr 3+ itself , the measuremeant waveleanth and reference waveleanth are found in measuring each content by double waveleanth photometric method. Measuring conditions including acidity, interfering ions and the linear range are studied. Measuring method is given. The experimental result shows that the linear range(0～2.5×10 -4 mol.l -1 for Cr 6+ and 0～2.0×10 -2 mol.l -1 for Cr 3+ ),accuracy and degree of precision in strong basicity can satisfy the requirement of analysis for the solution of eletrochromium.