Fenhexamid adsorption behavior on soil amended with wine lees.
The adsorption of fenhexamid (FEN) [N-(2,3-dichloro-4-hydroxyphenyl)-1-methylcyclohexanecarboxamide] on vineyard soil amended with wine lees (WL) produced by vinery was studied. The adsorption extent depends on WL fraction. The addition of the centrifuged solid lees (SWL) increases the FEN adsorption on soil. Most likely, the organic insoluble fraction formed mainly by dead fermentation yeasts is responsible for the observed increase. The adsorption measured on some deactivated yeasts of wine fermentation shows that Saccharomyces cerevisiae are the most active in FEN retention. On the other hand, the soil amendment with whole WL decreases considerably the fungicide adsorption. This opposite effect may be the result of FEN hydrophobic bonds with the dissolved organic matter of lees that keeps fungicide in solution. This hypothesis is substantiated by the increased FEN solubility in the supernatant of centrifuged wine lees (LWL). The results of soil column mobility confirm that the elution with LWL increases the mobility of FEN in soil.
Pinna
Maria Vittoria
MV
Dipartimento di Scienze Ambientali Agrarie e Biotecnologie Agro-alimentari, Universita di Sassari, Sassari, Italy.
Budroni
Marilena
M
Farris
Giovanni Antonio
GA
Pusino
Alba
A
D000327:Adsorption; D000577:Amides / Q000737:chemistry*; D005285:Fermentation; D005659:Fungicides, Industrial / Q000737:chemistry; D007220:Industrial Waste; D012987:Soil / Q000032:analysis*; D014920:Wine / Q000382:microbiology*; D015003:Yeasts
D000577:Amides; D005659:Fungicides, Industrial; D007220:Industrial Waste; D012987:Soil; C451426:N-(2,3-dichloro-4-hydroxyphenyl)-1-methylcyclohexanecarboxamide