IPICyT, Instituto Potosino de Investigacion Cientifica y Tecnologica, Division de Geociencias Aplicadas, Camino a la Presa San Jose No. 2055, Col. Lomas 4a Sec., 78216 San Luis Potosi, SLP, Mexico.
IPICyT, Instituto Potosino de Investigacion Cientifica y Tecnologica, Division de Geociencias Aplicadas, Camino a la Presa San Jose No. 2055, Col. Lomas 4a Sec., 78216 San Luis Potosi, SLP, Mexico.
J Hazard Mater. 2017 Oct 5;339:330-339. doi: 10.1016/j.jhazmat.2017.06.041. Epub 2017 Jun 21.
Mobility of Arsenic (As) from metallurgical wastes in Matehuala, Mexico has been accounted for ultra-high concentration of As in water (4.8-158mg/L) that is used for recreational purposes as well as cultivation of maize. In this study, we (i) measured As concentrations in soils irrigated with this water, (ii) investigated the geochemical controls of available As, and (iii) measured bioaccumulation of As in maize. Water, soil, and maize plant samples were collected from 3 different plots to determine As in environmental matrices as well as water soluble As in soils. Soil mineralogy was determined by X-ray diffraction analysis. Bioaccumulation of As in maize plants was estimated from the bioconcentration and translocation factors. We recorded As built-up in agricultural soils to the extent of 172mg/kg, and noted that this As is highly soluble in water (30% on average). Maize crops presented high bioaccumulation, up to 2.5 times of bioconcentration and 45% of translocation. Furthermore, we found that water extractable As was higher in soils rich in calcite, while it was lower in soils containing high levels of gypsum, but As bioconcentration showed opposite trend. Results from this study show that irrigation with As rich water represents a significant risk to the population consuming contaminated crops.
在墨西哥马塔莫罗斯，冶金废料中的砷（As）迁移性导致了水中砷含量极高（4.8-158mg/L），这些水不仅被用于娱乐目的，还被用于种植玉米。在这项研究中，我们：（i）测量了用这种水灌溉的土壤中的砷浓度；（ii）研究了有效砷的地球化学控制因素；（iii）测量了玉米中砷的生物累积。从 3 个不同的地块中采集了水、土壤和玉米植株样本，以确定环境基质中的砷以及土壤中的水溶态砷。土壤矿物学通过 X 射线衍射分析确定。通过生物浓缩和转运因子来估计玉米植株中砷的生物累积。我们记录了农业土壤中砷的积累程度达到了 172mg/kg，并注意到这些砷在水中的溶解度很高（平均为 30%）。玉米作物表现出很高的生物累积性，生物浓缩倍数高达 2.5 倍，转运率为 45%。此外，我们发现富含方解石的土壤中可提取的砷含量较高，而含有高石膏水平的土壤中砷的含量较低，但砷的生物浓缩则呈现相反的趋势。这项研究的结果表明，用富含砷的水灌溉对食用受污染作物的人群构成了重大风险。
