双中间体库仑法测定制革鞣液及废水中铬(Ⅵ)  

DETERMINATION OF CHROMIUM(VI) IN LEATHER TANNING LIQUOR AND WASTE WATER BY DUAL-INTERMEDIATE COULOMETRIC METHOD

作　　者：杜宝中 田家乐 杨希庆 

出　　处：《陕西科技大学学报（自然科学版）》1994年第3期551-558,共8页Journal of Shaanxi University of Science & Technology

摘　　要：本文研究了Ｆｅ（Ⅱ）－Ｃｅ（Ⅳ）双中间体库仑法测定制革鞣液及废水中铬（Ⅳ）的方法及条件。在３．５ｍｏｌ·ｌ－１Ｈ２ＳＯ４－０．０１５ｍｏｌ·ｌ－１Ｆｅ２（ＳＯ４）３－４ｍｇ／ｍｌＣｅ２（ＳＯ４）３电解液中共有少量ＡｇＮＯ３存在下．以Ｆｅ（Ⅱ）－Ｃｅ（Ⅳ）为双中间体库仑滴定，平衡电位法指示终点。文中对共存物的干扰及消除进行了详细研究，测定０．５μｇ和５．０～１００．０μｇＣｒ（Ⅵ）相对误差分别小于±１０％和±１％，标准偏差分别为０．０２和０．０７。该法测定结果与比色法对照，结果基本一致，但该法简便，快速。灵敏，准确，不受颜色和混浊度影响，勿需配制任何标准液．并可在同一电解液中连续多次测定。因此，该法在制革工业生产及环境保护中具有广阔的应用前景。A new method of determinating of Cr(Ⅵ) leather tanning and waste water using dualintermediate tEe (Ⅱ ) -Ce(Ⅳ )] coulometric method has been studied in the paper. This process be carried out under atmosphere without passing N2 The base electrolytic solution is a mixture of 3. smol/l H2SO4, 0. 015mol/l Fe2(SO4)3 and 4mg/ml Ce2(SO4)3. A small amount of silver nitrate is added, which will depress the interference of dissolved oxygen. Compared with the dipbenyl carbazide colrimetric method, the relative errors of the measuring of 0. 5ug and 5. 0g Cr(Ⅵ) are less than 10% and 1% respectivily The standard deviation are 0. 02 and 0. 07 respectivily. But this method is a simplified, quick, sensitive and accurate, which would not be affected by the colour and turbility of the samples. Standard solutions are not prepared, and, the sample may be added in continously. Therefore, this method can be widely applied in leather industry, electroplating and eviroment protection.

关 键 词：Fe(Ⅱ)-Ce(Ⅳ)双中间体库仑法 平衡电位 铬鞣液 废水 

分 类 号：O657.1[理学—分析化学]