This study assesses hexavalent chromium [Cr(VI)] and nitrate (NO₃⁻) in polluted groundwater and soil, and evaluates the impact on the health of the inhabitants of the Matanza-Riachuelo River basin, Argentina. Sixty groundwater samples and 18 soil samples were collected. Statistical analysis and Stiff diagrams were used for the hydrochemical characterization of the groundwater. A method developed by the United States Environmental Protection Agency for health risk assessment was applied to the Upper and the Puelche aquifers. The non-carcinogenic (NCR) and carcinogenic risks (CR) posed by Cr(VI) and NO₃⁻ in groundwater via ingestion and dermal contact were determined in children and adults. The effect of Cr on children through ingestion, dermal contact and inhalation as a result of exposure to soil was also established. The results indicated that the Cr(VI) and NO₃⁻ average values were 0.35 mg/L and 76 mg/L, respectively, in the Upper Aquifer, whereas the Cr(VI) average values were 1.41 mg/L and 38 mg/L for NO₃⁻ in the Puelche Aquifer. Children and adults exposed to groundwater via ingestion and dermal contact faced acceptable NCR of NO₃⁻, but unacceptable NCR and CR of Cr(VI). Water ingestion was the main exposure route; HQ_ing = 4.15 and 4.07 and CR_ing = 2.74E−03 and 2.36E−03 in children and adults, respectively, in the Upper Aquifer; HQ_ing = 17 and 14.1 and CR_ing = 1.04E−02 and 9.81E−03 in children and adults, respectively, in the Puelche Aquifer. As regards the soil exposure pathways, NCR and CR of Cr(VI) are unacceptable, dermal contact being the main route (HQ_derm = 4.63; CR_derm = 9.34E−04).

本研究评估六价铬[铬（VI）]和硝酸盐（NO ₃ ^- ）在污染的地下水和土壤，并评估对马坦萨-Riachuelo流域，阿根廷的居民的健康的影响。收集了60个地下水样品和18个土壤样品。统计分析和僵化图用于地下水的水化学表征。由美国环境保护局开发的健康风险评估方法已应用于上层和Puelche含水层。Cr（VI）和NO ₃构成的非致癌性（NCR）和致癌风险（CR）^-在儿童和成人中通过摄入和皮肤接触确定了地下水中的维生素D含量。还确定了铬通过摄入，接触皮肤和因暴露于土壤而吸入对儿童的影响。结果表明，将Cr（VI）和NO ₃ ^-的平均值分别为0.35毫克/ L和76毫克/升，在上层含水层，而将Cr（VI）的平均值分别为1.41毫克/升和38毫克/ L用NO ₃ ^-中的Puelche酒店含水层。通过摄入和皮肤接触而暴露于地下水中的儿童和成人面临可接受的NO ₃ ^- NCR，但不接受Cr（VI）的NCR和CR。摄入水是主要的暴露途径；HQ _ing  = 4.15和4.07以及CR _ing =上部含水层中的儿童和成人分别为2.74E-03和2.36E-03； 在Puelche含水层中，儿童和成人的HQ _ing  = 17和14.1，CR _ing = 1.04E-02和9.81E-03。关于土壤暴露途径，Cr（VI）的NCR和CR是不可接受的，主要途径是皮肤接触（HQ_皮肤 = 4.63； CR_皮肤 = 9.34E-0）。