Simultaneous Analysis of Trivalent Chromium and Hexavalent Chromium Using UV Spectroscopy

摘要

The present invention relates to a method by simultaneously analyzing trivalent chromium and hexavalent chromium contained in a chromium salt treatment solution. According to the present invention, a trichromium and a hexavalent chromium standard solution are prepared respectively, followed by an ultraviolet spectrophotometer. Absorbance at 580 nm and 440 nm of trivalent chromium standard solution and absorbance at 440 nm of hexavalent chromium standard solution were used to determine the calibration curve of absorbance vs. concentration of trivalent chromium at 580 nm and 440 nm and absorbance of hexavalent chromium at 580 nm. After preparing the calibration curve of the concentration, the content of trivalent chromium was measured by absorbance at 580 nm of the sample solution to be analyzed, and then substituted into the trivalent chromium absorbance large concentration calibration curve prepared at 580 nm, and then trivalent chromium in the sample solution. The concentration of hexavalent chromium was measured, and the absorbance vs. concentration calibration curve of the absorbance of the sample solution at 440 nm and the measured trivalent chromium concentration at 440 nm were used as the trivalent chromium standard solution. Measure the absorbance of trivalent chromium at 440 nm by substituting on and calculate the two absorbance differences (absorbance of hexavalent chromium only in the sample solution), and then substituting it on the absorbance vs. concentration calibration curve at 440 nm Simultaneous quantitative analysis of trivalent and hexavalent chromium is provided by measuring the concentration of hexavalent chromium in a sample solution.;In the case of simultaneously measuring trivalent chromium and hexavalent chromium by the ultraviolet spectroscopy method of the present invention, accurate analysis results can be obtained through simple experiments without a separate sample preparation process, and the analysis time is also greatly reduced, which is useful for process analysis of various processes. Can be utilized.