Hexavalent chromium on the human body toxicity, drinking water health standards for drinking water in the hexavalent chromium concentration can not exceed 0.05mg / L. For the detection of hexavalent chromium in drinking water, ion exchange chromatography can be used, UV detection. Chromatographic conditions and test results are as follows:
Chromatographic conditions:
Column: PR-SA-8A (250mm * 4.6mm) high-capacity column
Eluent: 50 mM Na2HPO4
Flow rate: 1.50ml / min
Detection wavelength: 313nm
Injection volume: 200ml
Chromatogram of CrO42-:

          Fig.1 Ion chromatogram of CrO42- (0.05 mg / L in Cr (Ⅵ)
Under the above chromatographic conditions, commercially available mineral water, vat water, tap water and other water samples were not detected hexavalent chromium. The recoveries of hexavalent chromium were between 91.3% and 100.9%, and the results were satisfactory.
                 Qingdao Pu Ren Instrument Co., Ltd. Technology Department Wang Cunjin