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首页> 外文期刊>Environmental Science & Technology >In vitro gastrointestinal bioavailability of arsenic in soils collected near CCA-treated utility poles
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In vitro gastrointestinal bioavailability of arsenic in soils collected near CCA-treated utility poles

机译：在CCA处理的电线杆附近收集的土壤中砷的体外胃肠道生物利用度

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摘要

Because of the potentially high arsenic concentrations found in soils immediately adjacent to chromated copper arsenate (CCA)-treated wood structures and utility poles, CCA-contaminated soil ingestion may be a significant exposure route to arsenic for children. Therefore, a strong need exists to provide accurate data on oral relative bioavailability (RBA) of arsenic (in vivo or in vitro) in field-collected CCA-contaminated soils. The objectives of this study were (1) to assess arsenic bioaccessibility in contaminated soils collected near in-service CCA-treated utility poles, (2) to determine the influence of soil properties and arsenic fractionation on arsenic bioaccessibility, and (3) to estimate an average daily arsenic intake from incidental soil ingestion. Arsenic bioaccessibility ( in vitro gastrointestinal (IVG) method) was determined on surface soil samples collected immediately adjacent to 12 CCA-treated utility poles after 18 months of service. Bioaccessible arsenic was also determined in 3 certified reference materials. Total arsenic concentrations in soils (< 300 mu m) varied from 37 ( 2 to 251 (12 mg/kg, irrespective of soil organic matter content with the major soil-bound arsenic species being As-(V). Arsenic bioaccessibility ranged between 25.0 +/- 2.7 and 66.3 (2.3% (mean value 40.7 (14.9%). The mean value was in agreement with the in vivo arsenic RBA reported by Casteel et al. (2003) in soil near CCA-treated utility poles. Bioaccessible arsenic was positively correlated with total organic carbon content (r(2) = 0.36, p < 0.05) and with water-soluble arsenic (r(2) = 0.51, p < 0.01), and was negatively correlated with clay content (r(2) = 0.43, p < 0.05). Using conservative exposure parameters, the mean daily arsenic intake from incidental ingestion of contaminated soil near CCA-treated utility poles was 0.18 (0.09 Ag As kg(-1) d(-1). This arsenic intake appeared negligible compared to the daily intake of inorganic arsenic from water and food ingestion for children.
机译：由于在紧邻铬酸砷酸铜（CCA）处理的木结构和电线杆的土壤中发现了潜在的高砷浓度，因此CCA污染的土壤摄入可能是儿童接触砷的重要途径。因此，迫切需要提供有关田间收集的CCA污染土壤中砷（体内或体外）的口服相对生物利用度（RBA）的准确数据。这项研究的目的是（1）评估在使用中的CCA处理过的电线杆附近收集的受污染土壤中的砷生物可利用性；（2）确定土壤性质和砷分级对砷生物可利用性的影响；以及（3）估算土壤偶然摄入的平均每日砷摄入量。服役18个月后，立即从12个经过CCA处理的电线杆附近收集的表层土壤样品中测定砷的生物可及性（体外胃肠道（IVG）方法）。还通过3种经过认证的参考材料确定了可生物接触的砷。土壤中的总砷浓度（<300微米）从37（2到251（12 mg / kg），与土壤中有机质含量无关，主要结合土壤的砷种类为As-（V），砷的生物可及性介于25.0之间+/- 2.7和66.3（2.3％（平均值40.7（14.9％）。平均值与Casteel等人（2003年）报道的在CCA处理的电线杆附近的土壤中体内砷RBA一致）。与总有机碳含量（r（2）= 0.36，p <0.05）和水溶性砷（r（2）= 0.51，p <0.01）呈正相关，与粘土含量呈负相关（r（2） ）= 0.43，p <0.05）。使用保守的暴露参数，在CCA处理的电线杆附近偶然摄入污染土壤造成的每日平均砷摄入量为0.18（0.09 Ag As kg（-1）d（-1）。与儿童每天从水和食物中摄入无机砷相比，摄入量微不足道。

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