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Journal of Environmental Quality Abstract - Organic Compounds in the Environment

Assessment of Spent Mushroom Substrate as Sorbent of Fungicides: Influence of Sorbent and Sorbate Properties

 

This article in JEQ

  1. Vol. 41 No. 3, p. 814-822
     
    Received: Nov 19, 2011


    * Corresponding author(s): mjesus.sanchez@irnasa.csic.es
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doi:10.2134/jeq2011.0437
  1. Jesús M. Marín-Benitoa,
  2. M. Sonia Rodríguez-Cruza,
  3. M. Soledad Andradesb and
  4. María J. Sánchez-Martín *a
  1. a Instituto de Recursos Naturales y Agrobiología de Salamanca (IRNASA-CSIC), Cordel de Merinas 40-52, 37008 Salamanca, Spain
    b Departamento de Agricultura y Alimentación, Universidad de La Rioja, Madre de Dios 51, 26006 Logroño, Spain. Assigned to Associate Editor Lakhwinder Hundal

Abstract

The capacity of spent mushroom substrate (SMS) as a sorbent of fungicides was evaluated for its possible use in regulating pesticide mobility in the environment. The sorption studies involved four different SMS types in terms of nature and treatment and eight fungicides selected as representative compounds from different chemical groups. Nonlinear sorption isotherms were observed for all SMS–fungicide combinations. The highest sorption was obtained by composted SMS from Agaricus bisporus cultivation. A significant negative and positive correlation was obtained between the Koc sorption constants and the polarity index values of sorbents and the Kow of fungicides, respectively. The statistic R2 revealed that more than 77% of the variability in the Koc could be explained considering these properties jointly. The other properties of both the sorbent (total carbon, dissolved organic carbon, or pH) and the sorbate (water solubility) were nonsignificant. The hysteresis values for cyprodinil (log Kow = 4) were for all the sorbents much higher (>3) than for other fungicides. This was consistent with the remaining sorption after desorption considered as an indicator of the sorption efficiency of SMS for fungicides. Changes in the absorption bands of fungicides sorbed by SMS observed by FTIR permitted establishing the interaction mechanism of fungicides with SMS. The findings of this work provide evidence for the potential capacity of SMS as a sorbent of fungicides and the low desorption observed especially for some fungicides, although they suggest that more stabilized or humified organic substrates should be produced to enhance their efficiency in environmental applications.

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