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贵屿地区不同类型农业土壤多溴联苯醚的污染特征和暴露评估

DOI: 10.11654/jaes.2015.05.010

Keywords: 多溴联苯醚 贵屿 风险评估 电子垃圾拆解区

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Abstract:

在贵屿及周边区域128 km2内,采集了131份不同土地利用方式的表层农业土壤样品,分析测定了41个多溴联苯醚的含量。结果表明,贵屿镇及周边农业土壤41个多溴联苯醚含量范围为30~9400 ng·g-1,其中十溴联苯醚(BDE209)为Nd~9200 ng·g-1,检出率达90%以上的有18个多溴联苯醚同系物,PBDEs已经普遍存在于电子垃圾拆解区域的农业土壤;在不同土地利用方式中,除BDE209以外的40个多溴联苯醚之和(∑40PBDEs)和BDE209含量呈现相反的趋势,∑40PBDEs含量呈水稻田 >果园 >其他水田 >菜地 >树林 >废弃地,BDE209呈现出废弃地 >菜地 >其他水田 >水稻田 >果园 >树林的趋势。根据HJ 25.3-2014《污染场地风险评估技术导则》对美国环保署(EPA)优控的BDE47、BDE99、BDE153、BDE209等含量,按照各土地利用类型的土壤进行了皮肤接触途径、经口摄入、随土壤颗粒物直接吸入三项的暴露风险评估,结果表明皮肤接触途径 >经口摄入 >随土壤颗粒物吸入风险。虽然三者均未超出美国环保署参考剂量,但农业土壤中多溴联苯醚经农作物吸收造成的暴露风险亟需进一步的研究

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