A sensitive colorimetric reagent for the determination of cyanide and hydrogen cyanide in various environmental samples

作者：Agrawal O; Sunita G; Gupta VK^*

来源：Journal of the Chinese Chemical Society, 2005, 52(1): 51-57.

• cyanide
• hydrogen cyanide
• spectrophotometrically biological
• environmental samples using PAAP

A sensitive reagent system is proposed for the determination of cyanide and hydrogen cyanide in various environmental samples. The method is based on the conversion of cyanide into cyanogen bromide followed by its reaction with pyridine to form glutaconic aldehyde. The glutaconic aldehyde so formed is coupled with p-aminoacetophenone forming yellow-orange polymethine dye measured at 445 nm. The colour system obeys Beer's law in the range of 0.01-0.16 ppm of cyanide in aqeous phase and 0.002-0.03 ppm in extracting system. The molar absorptivity and Sandell's sensitivity were found to be 6.51 x 10(5) 1 mol(-1) cm(-1) and 0.0001 mu g cm(-2), respectively. The method has been successfully applied for the determination of cyanide in air, industrial effluent, biological samples, and in the pesticide acrylonitrile.

• 出版日期2005-2