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首页> 外文期刊>Human and ecological risk assessment >Influence Of Matrix Composition On The Bioaccessibility Of Copper, Zinc, And Nickel In Urban Residential Dust And Soil
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Influence Of Matrix Composition On The Bioaccessibility Of Copper, Zinc, And Nickel In Urban Residential Dust And Soil

机译：基质组成对城市居民粉尘和土壤中铜，锌和镍生物可利用性的影响

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This study examines factors affecting oral bioaccessibility of metals in household dust, in particular metal speciation, organic carbon content, and particle size, with the goal of addressing risk assessment information requirements. Investigation of copper (Cu) and zinc (Zn) speciation in two size fractions of dust (<36 μm and 80-150 μm) using synchrotron X-ray absorption spectroscopy (XAS) indicates that the two metals are bound to different components of the dust: Cu is predominately associated with the organic phase of the dust, while Zn is predominately associated with the mineral fraction. Total and bioaccessible Cu, nickel (Ni), and Zn were determined (on dry weight basis) in the <150 μm size fraction of a set of archived indoor dust samples (n = 63) and corresponding garden soil samples (n = 66) from the City of Ottawa, Canada. The median bioaccessible Cu content is 66 μg g~(-1) in dust compared to 5 μg g~(-1) in soil; the median bioaccessible Ni content is 16 μg g~(-1) in dust compared to 2 μg g~(-1) in soil; and the median bioaccessible Zn content is 410 μg g~(-1) in dust compared to 18 μg g~(-1) in soil. For the same data set, the median total Cu content is 152 μg g~(-1) in dust compared to 17 μg g~(-1) in soil; the median total Ni content is 41 μg g~(-1) in dust compared to 13 μg g~(-1) in soil; and the median total Zn content is 626 μg g~(-1) in dust compared to 84 μg g~(-1) in soil. Organic carbon is elevated in indoor dust (median 28%) compared to soil (median 5%), and is a key factor controlling metal partitioning and therefore bioaccessibility. The results show that house dust and soil have distinct geochemical signatures and should not be treated as identical media in exposure and risk assessments. Separate measurements of the indoor and outdoor environmen t are essential to improve the accuracy of residential risk assessments.
机译：这项研究调查了影响家庭灰尘中金属的口腔生物可及性的因素，特别是金属形态，有机碳含量和粒径，目的是解决风险评估信息要求。使用同步加速器X射线吸收光谱法（XAS）研究了两种大小的粉尘（<36μm和80-150μm）中的铜（Cu）和锌（Zn）形态，结果表明这两种金属结合到金属的不同成分上。粉尘：铜主要与粉尘的有机相结合，而锌主要与矿物质含量相关。在一组存档的室内灰尘样品（n = 63）和相应的花园土壤样品（n = 66）中，<150μm尺寸分数中确定了全部和生物可利用的铜，镍（Ni）和锌（以干重计）。来自加拿大渥太华市。尘土中可生物利用的铜含量中位数为66μgg〜（-1），而土壤中的生物可利用铜含量为5μgg〜（-1）；尘土中可生物利用的镍含量的中位数为16μgg〜（-1），而土壤中的生物可利用Ni含量为2μgg〜（-1）；灰尘中锌的平均可利用锌含量为410μgg〜（-1），而土壤中锌含量为18μgg〜（-1）。对于相同的数据集，粉尘中的总铜含量中位数为152μgg〜（-1），而土壤中为17μgg〜（-1）。尘土中镍的总中位数为41μgg〜（-1），而土壤中的总Ni含量为13μgg〜（-1）；灰尘中的总锌含量中位数为626μgg〜（-1），而土壤中的总锌含量为84μgg〜（-1）。与土壤（中位数为5％）相比，室内灰尘中的有机碳（中位数为28％）升高，并且是控制金属分配以及生物可及性的关键因素。结果表明，房屋的灰尘和土壤具有明显的地球化学特征，在暴露和风险评估中不应视为相同的介质。室内和室外环境的单独测量对于提高住宅风险评估的准确性至关重要。

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