AbstractA solution of piperazine in water was photochemically oxidised by the dissolved oxygen when irradiated with ‘sunlight’ ultraviolet radiation obtained with a Hanau Q‐300 lamp, or with RUL‐300 nm lamps. Sensitisers (riboflavin, acetone and benzophenone) did not increase the rate of the oxidation induced by the RUL‐300 nm lamps; however, they (especially riboflavin) accelerated the oxidation induced by the Hanau Q‐300 lamp. A large number of products were observed in the sensitised oxidation but they were not analysed further. The irradiation mixture of the non‐sensitised photo‐oxidation, when 65 of the initial piperazine had been transformed, contained piperazine (35), glycine (approximately 25) and three unidentified compounds in equal amounts (approximately 13 each); the same products were obtained with both irradiation systems. The photo‐oxidation of piperazine, a metabolite of the fungicide triforine, 1,4‐bis(2,2,2‐trichloro‐l‐formamidoethyl)piperaerazine, could thus be a way for the latter's biodegradation at a surface, or in plant tissues, this biodegradation hav
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