Carrier mediated of toxic elements, Part (III) Permeability of Chromium using SLM containing TPPS/xylene and application of chromium in water samples

Abstract

Extractive removal of chromium Cr (III) from chloride solutions was carried out using TPPS/xylene. The efficiency of this extractant was studied under various experimental conditions, such as concentration of the aqueous phase, concentration of TPPS and Cr (III) present in the initial aqueous feed. The DTPA as stripping phase, temperature and time of extraction was studied. The percentage of Cr (III) extraction decreases with the increase of temperature at varying concentration of TPPS. The interference of the Cr (VI), Cr (III) and chloride were examined at the optimized conditions. Under the optimum experimental conditions 98.6–99.9% of Cr (III) was extracted in 30–50 min at O/A of 1 with the initial feed concentration of 0.5 g/L of Cr (VI). The extracted Cr (III) was quantitatively stripped with 0.02M DTPA. The repeated transport experiments of SLM was shown and to reused in succeeding extraction of chromium (III). Finally a few experiments were performed with the water samples effluent from River Sea and lake. The repeated transport experiment of SLM was shown and the stability of SLM was described using the Danesi’s thermodynamic model. The long-term integrity of SLM was found. Total chromium was determined after the reduction of Cr (VI) to Cr (III) by using ascorbic acid as reducing reagent. The proposed optimization has been applied to the speciation of chromium in natural water samples with satisfactory results.