Sorption of atrazine and phenanthrene by organic matter fractions in soil and sediment.
Sorption of atrazine and phenanthrene by organic matter fractions in soil and sediment.
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DOI：
10.1016/j.envpol.2010.08.022
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发表时间：
2010-12
影响因子：
8.9
通讯作者：
Ke Sun;Bo Gao;Zheyun Zhang;Guixiang Zhang;Ye Zhao;B. Xing
中科院分区：
文献类型：
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作者：
Ke Sun;Bo Gao;Zheyun Zhang;Guixiang Zhang;Ye Zhao;B. Xing
研究了非水解碳(NHC)、黑碳(BC)、腐植酸(HA)以及全沉积物和土壤样品对阿特拉津和菲(Phen)的吸附作用。阿特拉津的吸附等温线接近线性。沉积物1(ST1)中分离出的HA1、NHC1和Bc1的单点有机碳(OC)归一化分配系数(KOC)分别是ST1的36、550和1470倍，表明沉积物有机质，特别是凝聚态(NHC和BC)的重要性。NHC对阿特拉津和邻菲咯啉的吸附能力相似，但等温线非线性不同，表明它们的结构和疏水性不同，吸附区域也不同。在低浓度下，NHC的(O+N)/C比与阿特拉津logKOCat的(O+N)/C呈正相关，提示存在氢键相互作用。这项研究表明，沉积物对阿特拉津的吸附效果可能不如Phen，这意味着应用于沉积物或土壤中的阿特拉津可能会渗入地下水。
Atrazine and phenanthrene (Phen) sorption by nonhydrolyzable carbon (NHC), black carbon (BC), humic acid (HA) and whole sediment and soil samples was examined. Atrazine sorption isotherms were nearly linear. The single-point organic carbon (OC)-normalized distribution coefficients (KOC) of atrazine for the isolated HA1, NHC1 and BC1 from sediment 1 (ST1) were 36, 550, and 1470 times greater than that of ST1, respectively, indicating the importance of sediment organic matter, particularly the condensed fractions (NHC and BC). Similar sorption capacity of atrazine and Phen by NHC but different isotherm nonlinearity indicated different sorption domains due to their different structure and hydrophobicity. The positive relationship between (O+N)/C ratios of NHC and atrazine logKOCat low concentration suggests H-bonding interactions. This study shows that sediment is probably a less effective sorbent for atrazine than Phen, implying that atrazine applied in sediments or soils may be likely to leach into groundwater.