Sorption of atrazine, alachlor and trifluralin from water onto different geosorbents
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چکیده
10 The sorption behavior of the herbicides atrazine, alachlor and trifluralin on four sorbents (two 11 modified organoclays, one model sediment, and one natural sediment) in three water matrices 12 (synthetic water, natural groundwater and surface water) was investigated. The influence of 13 the sorbent and water matrix characteristics was elucidated. All adsorption isotherms fitted 14 well with the Freundlich model. Based on the Kd values, the organically modified bentonite 15 and model sediment proved to be the most effective sorbents for the investigated herbicides. 16 A linear correlation of Kd with the total organic carbon (TOC) concentration was found for 17 trifluralin in synthetic water matrix (c0= 0.01 mg/L). In the case of higher trifluralin 18 concentration and for other tested herbicides at all concentrations the influence of both the 19 sorbent organic matter quality and possible interactions with the mineral phase was indicated. 20 Furthermore, the results showed different influence of the type and the content of dissolved 21 organic carbon (DOC) in the water phase on the sorption of all the herbicides, depending on 22 the herbicide concentration and the sorbent applied. It was confirmed that the comparison of 23 sorbent efficiency should be done in native matrix since sorption coefficients vary depending 24 on pollutant concentration DOC concentration and DOC fractions. This finding is considered 25 to be important to pay attention for in remediation of contaminated sites. 26 27
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تاریخ انتشار 2014