Using the SBRC Assay to Predict Lead Relative Bioavailability in Urban Soils: Contaminant Source and Correlation Model
Using the SBRC Assay to Predict Lead Relative Bioavailability in Urban Soils: Contaminant Source and Correlation Model
复制标题
使用 SBRC 测定法预测城市土壤中铅的相对生物利用度：污染物来源和相关模型
DOI：
10.1021/acs.est.6b00480
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发表时间：
2016-05-17
影响因子：
11.4
通讯作者：
Ma, Lena Q.
中科院分区：
文献类型：
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作者：
Li, Hong-Bo;Zhao, Di;Ma, Lena Q.
利用体外生物可利用性试验预测污染土壤中铅的相对生物有效性（RBA）已得到证实，然而，在城市土壤中低水平铅的研究有限。采用SBRC法测定了中国27个省会城市公园土壤中162种Pb的生物可利用性，并采用小鼠肾法测定了38个子样中的Pb-RBA。土壤中总铅含量为9.3-1198 mg kg（-1），92%的土壤中铅含量> 100 mg kg（-1）。稳定同位素指纹技术的基础上，燃煤灰被确定为主要的铅源，有助于增加铅的生物可利用性与土壤铅浓度。铅-RBA在疖子中为17- 87%，显示出与铅生物可利用性的强线性相关性（r（2）= 0.61），基于随机二次抽样和留一法的相关性的交叉验证产生低预测误差。基于38个土壤的大样本量，本研究表明SBRC分析的Pb-RBA预测能力可以从采矿/冶炼影响的土壤扩展到Pb水平较低的城市土壤。
Using in vitro bioaccessibility assays to predict Pb relative bioavailability (RBA) in contaminated soils has been demonstrated, however, limited research was performed on urban soils having lower Pb levels. In this Study, 162 soils from urban parks in 27 capital cities in China were measured for Pb bioaccessibility using the SBRC assay, with Pb-RBA in 38 subsamples being measured using a mouse-kidney assay. Total Pb concentrations in soils were 9.3-1198 mg kg(-1), with 92% of the soils having Pb concentrations 100 mg kg(-1). On the basis of a stable isotope fingerprinting technique, coal combustion ash was identified as the major Pb source, contributing to the increased Pb bioaccessibility with increasing soil Pb concentration. Lead-RBA in boils was 17-87%, showing a strong linear correlation with Pb bioaccessibility (r(2) = 0.61), with cross validation of the correlation based on random subsampling and leave-one-out approaches yielding low prediction errors. On the basis of the large sample size of 38 soils, this study demonstrated that the Pb-RBA predictive capability of the SBRC assay can be extended from mining/smelting impacted soils to urban soils with lower Pb levels.