Alkaline hydrolysis of vinclozolin: Effect of humic acids aggregates in water

• Influence of humate aggregates on the stability of vinclozolin was investigated.
• The catalytic activity of these natural colloids in mentioned reaction was studied.
• Inhibitory effects for the basic hydrolysis of this fungicide have been observed in the presence of these substances.
• These behaviours were rationalized in terms of the micellar pseudophase model.

The influence of natural organic substances as humate colloidal aggregates in water solutions upon the chemical stability of vinclozolin has been investigated in basic media. A large inhibition (9 times-fold) has been observed and it has been rationalized in terms of a micellar pseudophase model. The observed behaviour could increase significantly the half-life of this fungicide. Moreover, these experimental results have been compared with the corresponding ones of other substances in these natural colloidal aggregates.

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