Flow Injection Spectrophotometric Determination of Iodide in Environmental Samples

摘要

An alternative and simple flow injection spectrophotometric analysis method for the determination of iodide in environmental samples is reported. The method is based on the catalytic destruction of the colour of the Fe(III)-SCN~--CP~+-_nBP_y quaternary complex. the complex shows maximum absorption at 495 nm. The apparent molar absorptivity of the complex in terms of iodide is (6.22) X 10~5 l mol~(-1) cm~(-1). The detection limit of the method is 0.1 ng ml~(-1) of iodide. The method obeys Beer's law up to 120 mug l~(-1) with slope, intercept and correlation coefficient of 0.11 , -0.52 and -0.99, respectively. Various flow injection analysis parameters for the determination of iodide in the environmental samples were optimized. the sample throughput of the method is 60 samples h~(-1). The method was successfully useful for the determination of tracelevel of iodide in environmental samples i.e. ground, surface water.