| 碘—淀粉络合物褪色光度法测定微量氰化物 |
| |
| 引用本文： | 王明,罗大莉,龚勇.碘—淀粉络合物褪色光度法测定微量氰化物[J].理化检验(化学分册),2001,37(1):25-26. |
| |
| 作者姓名： | 王明 罗大莉 龚勇 |
| |
| 作者单位： | 1. 四川省天然气化工研究院,
2. 四川轻化工学院 |
| |
| 摘 要： | 研究了在 p H 7.0的混合磷酸盐缓冲溶液条件下 ,氰根使碘与淀粉形成的蓝色络合物褪色 ,络合物吸光度的降低值 ΔA与加入的氰根量成正比。 λmax=570 nm,氰根在 0～ 2 0 μg/2 5ml范围内呈良好的线性关系 ,检出限为 0 .52μg/2 5ml,其表观摩尔吸光系数为 2 .6× 1 0 4 ,方法成功地用于含氰废水中氰化物的测定。
|
| 关 键 词： | 褪色光度法 氰化物 碘 淀粉 废水 污染物测定 环境监测 |
| 文章编号： | 1001-4020(2001)01-0025-02 |
| 修稿时间： | 1999年4月12日 |
PHOTOMETRIC DETERMINATION OF CYANIDE BY ITS DECOLORATION REACTION WITH THE BLUE COMPLEX OF IODINE AND STARCH |
| |
| WANG Ming,LUO Da-li,GONG Yong.PHOTOMETRIC DETERMINATION OF CYANIDE BY ITS DECOLORATION REACTION WITH THE BLUE COMPLEX OF IODINE AND STARCH[J].Physical Testing and Chemical Analysis Part B:Chemical Analgsis,2001,37(1):25-26. |
| |
| Authors: | WANG Ming LUO Da-li GONG Yong |
| |
| Abstract: | A decolorizing effect of the blue complex formed between iodine and starch is observed when it is
reacted with cyanide ion. Based on this phenomenon, an indirect photometric method for the determination of CN-
ion is proposed in this paper. The decoloration reaction is carried out in a Na2HPO4-KH2PO4 buffer medium of pH
7.0. The decrease in absorbance is measured at 570nm which is the absorption maxima of the blue complex. A lin
ear relationship is found between the decrease of absorbance (ΔA) and the CN- concentration in the range 0～20μg
per 25ml with an apparent molar absorptivity of 2.6×104L·mol-1·cm-1. The detection limit is 0.52μg/25ml.
The proposed method has been satisfactorily applied to the determination of CN- in waste water. |
| |
| Keywords: | Decoloration photometry Blue complex of iodine and starch Cyanides |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
