Micro and submicro iodometric determination of arsenite and sulphite ions by amplification reactions.
Two methods are described for the micro and submicro iodometric determination of arsenite and sulphite ions involving 3- and 6-fold amplification reactions, respectively. The arsenite method is based on oxidation with an excess of periodate, masking of the unreacted periodate with molybdate, and final iodometric titration of the iodate released. The sulphite method depends upon oxidation with iodine and removal of its excess by extraction with chloroform, and oxidation of the iodide formed to iodate, which is determined iodometrically as usual. The two methods are simple, rapid, and accurate. The average recoveries obtained are 99.9 and 99.3% for arsenite and sulphite, respectively.
Besada
A
A
Microanalytical Research Laboratory, National Research Centre, Dokki, Cairo, Egypt.
Gawargious
Y A
YA
Kareem
S Y
SY