Detection of iodine, bromine, arsenic(III), tin(II), mercury(II), silver, thiosulphate, and sulphite using setoglaucine O and setocyanine supra

Abstract

Setoglaucine O and Setocyanine Supra can be employed for the detection of iodine, bromine, arsenic(III), tin(II), mercury(II), silver(I), thiosulphate and sulphite. The method for iodine or bromine consists of treating 0.05 ml of 0.01 % solution of Setoglaucine O or Setocyanine Supra on the spot plate, with 0.05 ml of iodine or bromine solution, and diluting the mixture to 0.5 ml. Colour changes are blue to yellow green for iodine and blue to pale yellow for bromine. The tests for arsenic(III), tin(II), mercury(II), silver(I), thiosulphate and sulphite consist of treating 0.1 ml of 0.01 % Setoglaucine O or Setocyanine Supra with 0.05 ml of iodine in potassium iodide and 0.05 ml of the test solution, and diluting to 1 ml. The solution assumes the original blue colour of the dye in the presence of these ions.