Effect of the addition of ammonium ferric citrate and titanium dioxide on the surface photochemistry of some dicarboximid group fungicides
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OSIPOV, Ivan, DUKA, Gh.. Effect of the addition of ammonium ferric citrate and titanium dioxide on the surface photochemistry of some dicarboximid group fungicides. In: Achievements and perspectives of modern chemistry, 9-11 octombrie 2019, Chişinău. Chisinau, Republic of Moldova: Tipografia Academiei de Ştiinţe a Moldovei, 2019, p. 184. ISBN 978-9975-62-428-2.
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Achievements and perspectives of modern chemistry 2019
Conferința "International Conference "Achievements and perspectives of modern chemistry""
Chişinău, Moldova, 9-11 octombrie 2019

Effect of the addition of ammonium ferric citrate and titanium dioxide on the surface photochemistry of some dicarboximid group fungicides


Pag. 184-184

Osipov Ivan, Duka Gh.
 
Institute of Chemistry
 
Disponibil în IBN: 11 noiembrie 2019


Rezumat

Implementation of intensive agriculture with positive aspects gives also a problem of pollution of agriculture products, soil and as a consequence ground water with organic pollutants. The possible way to resolve this problem is the usage of additives, which can accelerate phototransformation of pollutants. Caused by high agriculture impact dicarboximide fungicides were chosen as model specifically iprodione, procimidone and vinclozolin. As additives the substances were chosen allowed for use in alimentation as food additives: titanium dioxide (E171) and ammonium ferric citrate (E 381). The pesticides were spread on silica and cellulose surfaces and the photo-degradation was followed under UV and sunlight irradiation. The main reaction pathways involve heterolitic and homolitic cleavage and cleavage of the N–CO bond. The main products are 3.5- dichlorphenyl isocyanate and 3.5- dichloroaniline, obtained without additives and with ammonium ferric citrate and titanium dioxide addition. In case of titanium dioxide the degradation is much faster and no photo-products were detected in case of TiO2 usage (0.3 % w/w), sprayed as a water suspension. In case of TiO2 water suspension with concentration 0.1 % products identic to ones obtained during natural phototransformation were detected.Figure. GS-MS traces and remaining residues of the fungicide procymidone after two hours irradiation under sunlight on silica. (a) non-irradiated without additive; (b) sunlight irradiated without additive; (c) non-irradiated with TiO2 and (d) sunlight irradiated with TiO2.