CLOUD POINT EXTRACTION AND SPECTRO¬PHOTOMETRIC DETERMINATION OF As(III) USING BRILLIANT BLACK BN AS AN EXTRACTION AGENT IN WATER SAMPLES

Abstract

Cloud point methodology was successfully used for the extraction of trace amounts of arsenic (III) s a prior step to their determination by spectrophotometry. For the proposed method, Brilliant Black BN (BBB), trioctylamine (TOA), Triton X-114, and NaCl were applied as chelating, sensitizing agent, extraction and co-extraction agents, respectively. A linear calibration curve in the range of 8-1000 µg L^-1 of Brilliant Black BN (BBB) was acquired. Under the optimized conditions, the limit of detection (LOD) was 2.4 µg L^-1 and the relative standard deviation (RSD) for 2.4,100 and 400 µg L^-1 were 1.26, 2.05 and 1.18, respectively (n = 11). The application of the work is determination of arsenic (III) quantities in the various samples by spectrophotometric method. In addition, in this work TOA plays the same role of cationic surfactant and as a novel ion pairing reagent that was innovatively used instead of common cationic surfactants such as cetyltrimethylammonium bromide (CTAB).