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应用in vitro法评估土壤性质对土壤中Pb的生物可给性的影响
引用本文:郑顺安,王 飞,李晓华,王 海,万小春.应用in vitro法评估土壤性质对土壤中Pb的生物可给性的影响[J].环境科学研究,2013,26(8):851-857.
作者姓名:郑顺安  王 飞  李晓华  王 海  万小春
作者单位:1. 农业部农业生态与资源保护总站,北京100125;农业部环境保护科研监测所,天津300191
2. 农业部农业生态与资源保护总站,北京,100125
基金项目:农业部公益性(农业)行业科研专项,国家自然科学基金项目
摘    要:选取22种典型土壤样品,应用2种in vitro (体外模拟)试验方法——SBET法(simple bioaccessibility extraction test,生物有效性简化提取法)和PBET法(physiologically-based extraction test,生物原理提取法),定量阐明土壤性质对Pb的生物可给性的影响.结果表明:①SBET法中Pb的生物可给性为18.78%~77.08%,平均值为44.14%;PBET法中Pb的生物可给性为0.72%~50.51%,平均值为13.77%.除赤红壤和贵州黄壤外,其余20种土壤样品均表现为SBET法中Pb的生物可给性显著高于PBET法,并且随着土壤pH的增长,2种方法的差距更加显著.②逐步回归分析结果表明,在SBET法中,对土壤Pb的生物可给性影响最大的因子是土壤中w(黏粒),其次为pH,二者可以解释69.49%的Pb的生物可给性的变化;在PBET法中,对土壤Pb的生物可给性影响最大的因子是pH,其次为w(黏粒),二者可以解释73.65%的Pb的生物可给性的变化.研究结果说明,污染土壤中Pb的生物可给性可以根据土壤pH和w(黏粒)进行预测.

关 键 词:in  vitro试验    土壤性质  生物可给性  影响
收稿时间:2013/4/13 0:00:00
修稿时间:2013/5/13 0:00:00

Application of in Vitro Digestion Approach for Estimating Lead Bioaccessibility in Contaminated Soils:Influence of Soil Properties
ZHENG Shun-an,WANG Fei,LI Xiao-hu,WANG Hai and WAN Xiao-chun.Application of in Vitro Digestion Approach for Estimating Lead Bioaccessibility in Contaminated Soils:Influence of Soil Properties[J].Research of Environmental Sciences,2013,26(8):851-857.
Authors:ZHENG Shun-an  WANG Fei  LI Xiao-hu  WANG Hai and WAN Xiao-chun
Institution:Rural Energy & Environment Agency, Ministry of Agriculture, Beijing 100125, China;Rural Energy & Environment Agency, Ministry of Agriculture, Beijing 100125, China;Rural Energy & Environment Agency, Ministry of Agriculture, Beijing 100125, China;Rural Energy & Environment Agency, Ministry of Agriculture, Beijing 100125, China;Rural Energy & Environment Agency, Ministry of Agriculture, Beijing 100125, China
Abstract:A total of 22samples of surface soil were collected from different areas in China to investigate the influence of soil properties on subsequent bioaccessibility of lead (Pb). The bioaccessibility of Pb was evaluated by two in vitro extraction approaches. One is the simple bioaccessibility extraction test (SBET) and the other is the physiologically-based extraction test (PBET). The results showed that:1) the bioaccessibility of Pb for 22soil samples extracted by SBET accounted for 18.78%-77.08% with 44.14% in average, while that extracted by PBET varied from 0.72%-50.51% with 13.77% in average. It was found that the bioaccessibility of Pb in soils extracted by SBET was significantly higher than that by PBET in 20soil samples (except for latosolic red soil and yellow soil in Guizhou Province). Differences between using two methods increased as soil pH increased. 2) Under the circumstances of digestion study, multiple regression analysis showed that Pb bioaccessibility is related to pH level and clay content of soil. Using SBET method, the most important impact factor was clay content of soil and the next one was soil pH, while using PBET method, the most important one was soil pH and the second one was clay content of soil. These findings could provide the data that the bioaccessibility variation of Pb in 22soil samples were 69.49% and 73.65% from SBET and PBET schemes, respectively. In conclusion, this investigation conveniently predicted potential ecological risks of Pb in soils by determining the properties (pH, clay content) of several soil types.
Keywords:in vitro test  lead  soil properties  bioaccessibility  influence
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