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Vikelsoe et al.[17] suggested that a downward movement for DEHP occurred approximately 10 cm year-1 because the profile maximum occurred 20 cm deeper in 2 years. This result was confirmed by the data in UL soil with relative low Ri values of PAEs, where no vertical mixing has taken place, and atmospheric precipitation and/or floods may be responsible for presences of PAEs in surface soil. Conversely with DBP and DEHP frequently founded at 40-50 cm depth, which are mostly predominant of PAEs, DEP and DMP with light molecular weight were not detected in the soils deeper than 40 cm, except for DEP with trace amount in PG soil. The positive relations between pH and HOCs were observed in the forest soils in Germany , and in the urban soil in Hong Kong . |
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genhunter
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唐19930603(RXMCDM代发): 金币+5, 多谢应助！ 2015-10-21 21:51:29
唐19930603(RXMCDM代发): 金币+5, 多谢应助！ 2015-10-21 21:51:29
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Vikelsoe 等l.[17] 提出DEHP每年大概以10cm/年速度下降, 因为根据数据显示两年内最大值约为20cm. 这个结果得到来自未曾上下翻动区域的UL土壤中低Ri值的PAEs数据的确认，这个情况下，表层土壤中PAEs的来源可能是降水以及洪水。 与DBP相反，DEHP经常可以在40-50cm深处找到，这也是PAEs中含量最高的一种, 分子量较小的DEP和DMP在土层深度超过40cm是测不到的，除了在PG土壤中有微量存在之外。在德国森林土壤中和香港市土壤中内可以观察到pH和HOCs之间有正相关性。 |
2楼2015-05-22 15:29:29
