土壤和泥炭在两个不同分解阶段对linuron和metamitron的吸附

IF 1.6 4区环境科学与生态学 Q4 ENVIRONMENTAL SCIENCES

Soil & Sediment Contamination Pub Date : 1997-05-01 DOI:10.1080/15320389709383567

I. Franco, C. Vischetti, M. T. Baca, M. Nobili, C. Mondini, L. Leita

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引用次数: 10

摘要

研究了一种矿质土壤和两种泥炭在不同分解阶段对两种不同极性除草剂(linuron和metamitron)的吸附，确定了单位有机质的Freundlich系数和分布系数。有机肥(泥炭)的Freundlich吸附常数(K1)比矿质土高20 ~ 30倍，有机物(泥炭)的偏氮吸附常数(K1)比矿质土高40 ~ 90倍，反映了吸附对有机质含量和类型的依赖。分解良好的泥炭对两种除草剂的亲和性最高。疏水键被认为是一种可能的解释。对于linuron, K的变化通过正规化对有机碳的吸附减少到Koc变化的两倍以下，而对于metitron, Koc值不是恒定的，这证实了该参数对极性化合物可能没有什么意义。

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Adsorption of linuron and metamitron on soil and peats at two different decomposition stages

We studied the adsorption of two herbicides of different polarity, linuron and metamitron, by a mineral soil and two peats at different decomposition stages and determined Freundlich and distribution coefficients per unit of organic matter. The Freundlich adsorption constant (K1) was 20‐to 30‐fold higher in the case of linuron and 40‐to 90‐fold higher for metamitron for the organic materials (peats) than for the mineral soil, reflecting adsorption dependence on both organic matter content and type. The well‐decomposed peat showed the highest affinity for both herbicides. Hydro‐phobic bonding is suggested as a possible explanation. For linuron, the variation in K, was reduced to less than a twofold variation in Koc by normalizing adsorption to organic carbon, whereas for metamitron, Koc values were not constant, confirming that this parameter may be of little meaning for polar compounds.

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来源期刊

Soil & Sediment Contamination 环境科学-环境科学

CiteScore

4.20

自引率

10.00%

发文量

审稿时长

2.2 months

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