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目的:确认离子色谱法同时测定饮用水中三价铬((Cr3+)与六价铬(Cr6+)分析方法可靠、准确,达到检测要求。方法:通过对系统适用性、检测限和定量限、精密度、准确度、线性范围的考察,证明该方法适用于使用目的。结果:Cr3+浓度在0.20 mg/L～8.0 mg/L;Cr6+浓度在4.0×10-4 mg/L～0.40 mg/L范围内,具有良好的线性关系(r=0.9994;r=0.9998);方法检出限Cr3+和Cr6+分别为0.139 mg/L、0.304×10-3 mg/L;精密度RSD均小于5%,平均加标回收率为86.7%～101.6%。结论:该方法灵敏度高,重现性好,能满足同时测定饮用水中三价铬与六价铬的分析要求。
OBJECTIVE: To confirm that ion chromatography is a reliable and accurate method for the simultaneous determination of trivalent chromium (Cr3 +) and hexavalent chromium (Cr6 +) in drinking water and to meet the testing requirements.METHODS: The system suitability, detection limit and limit of quantification The results show that the method is suitable for the purpose of use.RESULTS: The concentration of Cr3 + is between 0.20 mg / L and 8.0 mg / L and the concentration of Cr6 + is between 4.0 × 10-4 mg / L and 0.40 mg / L (R = 0.9994; r = 0.9998). The detection limits of Cr3 + and Cr6 + were 0.139 mg / L and 0.304 × 10-3 mg / L, respectively. The RSDs of precision were all less than 5% The standard recoveries ranged from 86.7% to 101.6% .Conclusion: The method has high sensitivity and good reproducibility, and can meet the analytical requirements for simultaneous determination of trivalent chromium and hexavalent chromium in drinking water.