Chromium (Cr) (VI) is a toxic, mutagenic, and carcinogenic water pollutant. The standard ion chromatography (IC) method for quantification of Cr (VI) in water samples is Environmental Protection Agency Method 218.7, which requires postcolumn derivatization with 1,5-diphenylcarbazide and UV-Vis spectroscopy detection. Method 218.7 is Cr (VI) specific; thus, it does not allow detection of co-occurring natural and anthropogenic anions in environmental media. In this study, we developed an isocratic IC method with suppressed conductivity detection, a Metrohm Metrosep A Supp 7 column, and sodium carbonate/acetonitrile as mobile phase for simultaneous quantification of Cr (VI), , As (V) as arsenate, Se (VI) as selenate, and the common anions F^–, Cl^–, , , and . The determination coefficient for every analyte was >0.99 and the method showed good accuracy in quantification. Cr (VI), As (V), Se (VI), and limit of detection and limit of quantification were 0.1–0.6 μg/L and 0.5–2.1 μg/L, respectively. Recovery of Cr (VI) in various aqueous samples (tap water, surface water, groundwater, and wastewater) was between 97.2% and 102.8%. Overall, most analytes showed acceptable recovery (80–120%) in the environmental samples tested. The IC method was applied to track Cr (VI) and other anion concentrations in laboratory batch microcosms experiments with soil, surface water, and anaerobic medium. The IC method developed in this study should prove useful to environmental practitioners, academic and research organizations, and industries for monitoring low concentrations of multiple anions in environmental media, helping to decrease the sample requirement, time, and cost of analysis.

中文翻译：

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离子色谱法同时定量环境介质中的铬酸盐、砷酸盐、硒酸盐、高氯酸盐和其他无机阴离子


铬 (Cr) (VI) 是一种有毒、致突变和致癌的水污染物。用于定量水样中 Cr (VI) 的标准离子色谱 (IC) 方法是环境保护局方法 218.7，该方法需要使用 1,5-二苯卡巴肼进行柱后衍生化和紫外-可见光谱检测。方法 218.7 特定于 Cr (VI)；因此，它不允许检测环境介质中同时存在的天然和人为阴离子。在本研究中，我们开发了一种等度 IC 方法，采用抑制电导率检测、Metrohm Metrosep A Supp 7 色谱柱和碳酸钠/乙腈作为流动相，用于同时定量 Cr (VI)、 、As (V) 作为砷酸根、Se (VI) 作为硒酸根、以及常见阴离子 F ^– 、 Cl ^– 、 , ， 和 。每种分析物的测定系数>0.99，该方法显示出良好的定量准确度。 Cr (VI)、As (V)、Se (VI) 和 检测限和定量限分别为0.1-0.6 μg/L和0.5-2.1 μg/L。各种水样（自来水、地表水、地下水和废水）中 Cr (VI) 的回收率在 97.2% 至 102.8% 之间。总体而言，大多数分析物在测试的环境样品中显示出可接受的回收率 (80–120%)。 IC 方法用于跟踪土壤、地表水和厌氧介质的实验室批量微观实验中的 Cr (VI) 和其他阴离子浓度。 本研究中开发的 IC 方法对环境从业者、学术和研究组织以及行业监测环境介质中低浓度的多种阴离子很有用，有助于减少分析的样品需求、时间和成本。