A new concentration and determination method of hexavalent chromium in water by an organic solvent-soluble membrane filter

作者：Gao PY; Gu XX; Zhou TZ

来源：Analytical Letters, 1996, 29(4): 651-659.

• chromium
• spectrophotometry
• concentration
• solvent-soluble membrane filter

A new concentration and determination method for ppb-levels of hexavalent chromium ion in water, based on the reaction between chromium (VI) and iodide ion to form triiodide ion and the collection of the ion-associate of the triiodide ion with a cation surfactant on an organic solvent-soluble membrane filter, has been described. The color intensity due to the ion-associate in the resulting solution, obtained by dissolving the filter and solute, is directly proportional to the amount of chromium (VI) in the range 0.2 - 1.2 mu g. Detection limits better than 0.2 mu g dm(-3) as Cr (VI) can been achieved with a 100-fold enrichment factor, The diverse components normally present in water do wt interfere, The proposed method has been applied to the analysis of several water samples, such as ground water and waste waters, The recoveries of the chromium (VI) added to the samples are quantitative, and results found are satisfactory.

• 出版日期1996
• 单位首都师范大学