Different FIA procedures based on spectrophotometric determination of sulphide are described. For each method the effect of various parameters including, reagent concentrations, flow rate, pH mixing coil length, minicolumns and interfering species are investigated. Comparison of these methods with respect to detection limit, sampling rate and accuracy is made. Detection limits of 80 ppm, and 0.5 ppm with sampling rates 120, 30 and 44/hr, having the relative standard deviation 0.96, 1.8 and 0.4% respectively were observed for the three methods established.