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目的建立快速协同浊点萃取-分光光度法测定六价铬的新方法。方法在强酸性条件下,Triton X-100与正辛醇形成快速浊点萃取体系,室温下溶液分为两相,Cr(Ⅵ)与PAN形成的金属螯合物进入富胶束相中,达到快速分离富集的目标,采用分光光度法直接测定富胶束相中富集的Cr(Ⅵ)。结果当Cr(Ⅵ)浓度为1.3μg/L~18.0μg/L时,吸光度值F与Cr(Ⅵ)浓度成线性关系,线性回归方程为y=0.008 5x+0.522 1,相关系数(r)为0.998,检出限为0.40μg/L,相对标准偏差为3.2%~5.3%。环境水样加标回收率为96.9%~103.9%。结论本方法所用仪器简单,操作方便,可用于实际水样中Cr(Ⅵ)含量的检测。
Aim To establish a new method for rapid determination of hexavalent chromium by cloud point extraction combined with spectrophotometry. Methods Under the condition of strong acidity, Triton X-100 and n-octanol formed rapid cloud point extraction system. The solution was divided into two phases at room temperature. The metal chelate formed by Cr (Ⅵ) and PAN entered the micellar phase and reached Rapid separation and enrichment of the target, spectrophotometry direct determination of enriched micellar phase enriched Cr (Ⅵ). Results When the Cr (Ⅵ) concentration was 1.3μg / L ~ 18.0μg / L, the absorbency value F was linear with the concentration of Cr (Ⅵ). The linear regression equation was y = 0.008 5x + 0.522 1 and the correlation coefficient 0.998, the detection limit was 0.40μg / L, the relative standard deviation was 3.2% ~ 5.3%. Environmental water samples spiked recoveries of 96.9% ~ 103.9%. Conclusion The instrument used in this method is simple and easy to operate. It can be used for the determination of Cr (Ⅵ) in water samples.