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Article Dans Une Revue Environmental Toxicology and Chemistry Année : 2017

New promising antifouling agent based on polymeric biocide polyhexamethylene guanidine molybdate

Résumé

A new polymeric biocide polyhexamethylene guanidine (PHMG) molybdate has been synthesized. The obtained cationic polymer has limited water solubility of 0.015 g/100 mL and is insoluble in paint solvents. The results of acute toxicity studies indicate moderate toxicity of PHMG molybdate, which has a median lethal dose at 48 h of 0.7 mg/L for Daphnia magna and at 96 h of 17 mg/L for Danio rerio (zebrafish) freshwater model organisms. Commercial ship paint was then modified by the addition of a low concentration of polymeric biocide 5% (w/w). The painted steel panels were kept in Dnipro River water for the evaluation of the dynamics of fouling biomass. After 129-d exposure, Bryozoa dominated in biofouling of tested substrates, forming 86% (649 g/m2) of the total biomass on control panel surfaces. However, considerably lower Bryozoa fouling biomass (15 g/m2) was detected for coatings containing PHMG molybdate. Dreissenidae mollusks were found to form 88% (2182 g/m2) of the fouling biomass on the control substrates after 228 d of exposure, whereas coatings containing PHMG molybdate showed a much lower biomass value of 23.6 g/m2. The leaching rate of PHMG molybdate in water was found to be similar to rates for conventional booster biocides ranging from 5.7 μg/cm2/d at the initial stage to 2.2 μg/cm2/d at steady state.
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Dates et versions

hal-01905040 , version 1 (25-10-2018)

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Alexander Protasov, Jean-François Bardeau, Irina Morozovskaya, Mariia Boretska, Tetiana Cherniavska, et al.. New promising antifouling agent based on polymeric biocide polyhexamethylene guanidine molybdate. Environmental Toxicology and Chemistry, 2017, 36 (9), pp.2543-2551. ⟨10.1002/etc.3782⟩. ⟨hal-01905040⟩
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