A Cloud Point Extraction to Comparative Determination of Mercury (II) in Various Water Samples by the Spectrophotometric Method

Cloud point extraction (CPE) was used for the preconcentration of Hg (II) by spectrophotometric method.In this complex, Triton-X-114,Cetylpyridinium chloride (CPC) and NaCl were applied as the non ionic surfactant, sensitizing agent and electrolyte respectively.The lower limit of detection (LOD) acquired under the optimum conditions was 1.10μg L-1. Therelative standard deviations(RSDs) for ten replicate determinations at 250 and 750 μg L-1 were 1.98 and 2.21% respectively. A linear calibration curve in the range of 5-1100 μg L-1 with a correlation coefûcient of 0.9989 (n = 20) was acquired. The least square method was A = 2.01 ×10CHg + 1.34 ×10-2,where A is the absorbance and CHg shows the concentration of Hg (II) in μg L -1.In the present work, we have used CPE to spectrophotometric determination of mercury (II) in water samples from the rivers located in industrial and nonindustrial areas and also spring water and tab water as the purified and unpurified water samples respectively.