The complex formation and extraction of chromium(VI) with 2-[2-(4-methoxy-phenylamino)-vinyl]-1,3,3-trimethyl-3H-indolium chloride reagent was studied by means of spectrophotometry. The influence of medium acidity, the concentration of chloride ions and dye reagent, the nature of the extractant and some other factors (time of extraction, stability of color, interference, etc.) on the absorbance of colored extracts were studied. The optimum conditions were found to be 0.02-0.1M H2SO4, 1.0-1.5M NaCl, (2.0-2.5) x 10-4M of reagent. The absorbance of the colored extracts obeys Beer's Law in the range of 0.26-7.28 mg L-1. The procedure of Cr(VI) extraction and spectrophotometric determination was examined.
- 2-[2-(4-methoxy-phenylamino)-vinyl]-1,3,3-trimethyl-3H-indolium chloride
- Complex formation
ASJC Scopus subject areas
- Analytical Chemistry