Abstract
In the present investigations colorimetric titrations of arsenic(III), hydrazinc, thiosulphate and thiocyanate have been carried out by iodate procedures in the presence of mercuric ions. A Hilger Spekker absorptiometer unit (H 760) with a blue filter having a maximum transmission in the range of 450–500 mμ was employed for the titrations. Two end-points corresponding, respectively, to the reduction of iodate to iodide and the oxidation of the liberated iodide to iodine monochloride were obtained in HCl medium, the quantitative reduction of iodate to iodide being facilitated by the presence of mercuric ions. A study of the effect of the variation of acidity and dilution of the solution was carried out for both the end-points. As little as 5 mg of the reductants, could be determined with a precision of about 97% to 98%.
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