Effect of freeze-thawing cycles on soil aging behavior of individually spiked phenanthrene and pyrene at different concentrations.
Effect of freeze-thawing cycles on soil aging behavior of individually spiked phenanthrene and pyrene at different concentrations.
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DOI：
10.1016/j.scitotenv.2012.11.062
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发表时间：
2013-02
期刊：
影响因子：
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通讯作者：
Qing Zhao;B. Xing;P. Tai;Hong Li;L. Song;Lizhu Zhang;Peijun Li
中科院分区：
文献类型：
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作者：
Qing Zhao;B. Xing;P. Tai;Hong Li;L. Song;Lizhu Zhang;Peijun Li
本工作旨在研究冻融循环和非冻融循环对黑土和棕壤老化过程中菲和芘提取的浓度效应。用10，000 mgL-1表面活性剂SDBS在不同时间提取1、10和100μgg-1菲和芘污染的土壤。萃取量随接触时间的增加而降低。老化过程可分为两个阶段：一个最初的快速吸附期和一个缓慢的吸附期。1μgg− 1芘在黑土中的提取量在初始吸附阶段较高。两种土壤中100μgg− 1菲和芘的萃取效率达到平衡的时间分别短于1和10μgg−1。缓慢吸附引起的提取效率的变化受接触时间、土壤和化学品的理化性质以及化学品的施用浓度的影响。对于1和10μgg− 1菲和芘污染的土壤，冻融循环在最初的第1天和第8天提高了提取效率。在30和120天时，无冻融循环的提取效率高于有冻融循环的提取效率。提出了一个概念模型来解释这一过程。
This work was initiated to study the concentration effects on phenanthrene and pyrene extraction during process of aging in phaeozem and burozem with or without freeze–thawing cycles. 1, 10, and 100μgg−1phenanthrene and pyrene contaminated soils were extracted by 10,000mgL−1surfactant SDBS at various times. The extraction amount decreased with increasing contact time. Aging process could be divided into two stages: an initially rapid and then a slow sorption period. The amount extraction of 1μgg−1pyrene in phaeozem was higher at the initial sorption stage. The time for 100μgg−1phenanthrene and pyrene extraction efficiency to reach equilibrium in both soils were shorter than 1 and 10μgg−1. Changes in extraction efficiency rate caused by slow sorption were affected by contact time, physicochemical properties of soils and chemicals and the applied concentration of chemicals. For 1 and 10μgg−1phenanthrene and pyrene contaminated soils, freeze–thawing cycle increased the extraction efficiency at the initial 1st and 8th days. The extraction efficiency with no freeze–thawing cycle was higher than that with freeze–thawing cycles at 30 and 120days. A conceptual model was proposed to account for this process.