Abstract Hexavalent chromium (Cr(VI)) is toxic, but trivalent chromium (Cr(III)) is essential to organisms. Monitoring Cr(VI) and Cr(III) in soil can improve our understanding of Cr biogeochemistry and toxicity. However, it is difficult to rapidly determine Cr in different valences in soil using traditional methods. A new method, resin selective enrichment with laser-induced breakdown spectroscopy, for rapidly determining Cr in different valence states (total Cr, Cr(III), and Cr(VI)) in soil is presented here. The method effectively separated Cr(III) and Cr(VI). The regression coefficients for the total Cr, Cr(III), and Cr(VI) calibration curves were all >0.99. The total Cr and Cr(VI) limits of detection were 19.34 and 35.18 mg/kg, respectively. The total Cr and Cr(VI) relative standard deviations for repeat analyses were 7.69% and 12.98%, respectively. A portable laser induced breakdown spectroscopy instrument for detecting Cr in soil, developed in our laboratory, gave a regression coefficient for the total Cr concentration in soil of 0.993. The results indicated that the method can rapidly and accurately quantify Cr in different valence states in soil. There is potential for miniaturizing the instrument to allow Cr to be determined in soil in the field

中文翻译：

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使用树脂选择性富集结合激光诱导击穿光谱快速检测土壤中不同价态的铬：从实验室测试到便携式仪器

摘要 六价铬 (Cr(VI)) 是有毒的，而三价铬 (Cr(III)) 是生物体所必需的。监测土壤中的 Cr(VI) 和 Cr(III) 可以提高我们对 Cr 生物地球化学和毒性的理解。然而，传统方法难以快速测定土壤中不同价态的Cr。本文介绍了一种新方法，即利用激光诱导击穿光谱进行树脂选择性富集，用于快速测定土壤中不同价态（总 Cr、Cr(III) 和 Cr(VI)）中的 Cr。该方法有效地分离了 Cr(III) 和 Cr(VI)。总 Cr、Cr(III) 和 Cr(VI) 校准曲线的回归系数均 >0.99。总 Cr 和 Cr(VI) 的检测限分别为 19.34 和 35.18 mg/kg。重复分析的总 Cr 和 Cr(VI) 相对标准偏差分别为 7.69% 和 12.98%，分别。我们实验室研制的一种便携式激光诱导击穿光谱仪检测土壤中铬，得到土壤中铬总浓度的回归系数为0.993。结果表明，该方法可以快速准确地定量测定土壤中不同价态的Cr。有可能使仪器小型化，以便在现场测定土壤中的 Cr