Direct rapid determination of traces of sulfide in environment samples
来源期刊：中南大学学报(英文版)2002年第4期
论文作者：郭方遒 黄兰芳 梁逸曾
文章页码：250 - 254
Key words：total differential spectrophotometric method; p-amino-N,N-diethylaniline; K2Cr2O7; sulfide;environment samples
Abstract: An improved ethylene blue method for determination of sulfide is developed. It has been adapted to a direct determination of sulfide byboth common spectrophotometric method and total differential spectrophotometric method. In common spectrophotometric method, the calibration curve isA=1.69ρ+0.006 and the correlation coefficient is 0.9994.The apparent molar absorptivity is 5.42×104L·mol-1·cm-1and calibration curve is linerwhenρis in the range of 0-0.9 mg·L-1. In total differential spectrophotometric method, the calibration curve isA=9.25ρ+0.004 and the correlation coefficient is 0.9996. The apparent molar absorptivity is 2.96×105L·mol-1·cm-1and calibration curve is liner whenρis in the range of 0-0.10 mg·L-1.The sensitivity of this method is increased significantly compared with the former ethylene blue method. The speed of reaction is also faster than the former one. The limit of detection is found to be 1.0 ng·mL-1 by both common spectrophotometric method and total differential spectrophotometric method. Ten replicate analyses of a sample solution containing100 ng·mL-1sulfide give a relative standard deviation of 1.8%. The effects ofvarious cations and anions on the determination of sulfide are studied and procedures for removal of interference is described. The method is used forthe determination of sulfide in environmentsampleswith satisfactoryresults.
