磷化工区周边砷污染特征及形态分布研究
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摘要
在磷化工区上下风向区域内采集空气、土壤、水、食物样品,样品经过预处理,用原子荧光光谱仪测定各样品中总砷、总无机砷、As(Ⅲ)、As(Ⅴ)、DMA、MMA的含量。磷化工区下风向饮用水、灌溉水和土壤中总砷浓度分别为10.08μg/L、4.113μg/L和18.95mg/kg,磷化工区生产对下风向有一定的影响。磷化工区下风向各种食物中含砷量:大米>叶菜类蔬菜>根茎类蔬菜,大米中砷的含量为0.879mg/kg是国标准限值的5.86倍;空心菜(0.111mg/kg)和红苕叶(0.096mg/kg)分别为国标限值的2.22、1.92倍。空气中砷的存在形态主要为无机砷且As(Ⅴ)>As(Ⅲ),其中As(Ⅴ)占无机砷总量的51.8~71.6%。土壤中无机砷主要以As(Ⅴ)的形态存在,并且占总砷的79.5~95.0%,As(Ⅲ)的含量较低,在土壤中还存在一定量的有机砷。大米和红苕叶中砷的形态主要以As(Ⅲ)为主,分别占总砷含量的46.2~92.4%、54.6~74.6%。大米中砷含有一定量的As(Ⅴ)(2.8~22.5%)和DMA(6.9~22.6%),存在微量的MMA。在红苕叶中DMA的平均含量并不高,MMA则基本未检出,在红苕叶中总无机砷的含量比大米的要高,并且DMA含量比较少。可以看出无论是大米还是红苕叶中砷主要还是以无机态存在,而且基本不含有MMA。
引文
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