TY - JOUR

T1 - Abiotic degradation of halobenzonitriles

T2 - Investigation of the photolysis in solution

AU - Millet, Maurice

AU - Palm, Wolf Ulrich

AU - Zetzsch, Cornelius

N1 - Copyright 1998 Academic Press.

PY - 1998/9/1

Y1 - 1998/9/1

N2 - This paper presents first experiments of laboratory investigations of the photodegradation by direct photolysis (λ > 290 am) of cholorotahlonil, dichlobenil, chloroxynil, bromoxynil, and ioxynil in aqueous, pH-buffered, and organic solutions and the calculation of the quantum yields. The photolysis of chlorothalonil in water is low, with a corresponding low quantum yield (Φ = 0.0001). Dichlobenil is photostable under the laboratory conditions used. The photoreactivity of bromoxynil and ioxynil was found to be comparable in aqueous solutions and about three times lower with respect to chloroxynil. The quantum yields obtained in water of chloroxynil, bromoxynil, and ioxynil are Φ = 0.0060, 0.0093, and 0.0024, respectively. Half-lives of the pesticides in the environment with respect to direct irradiation are estimated using UV spectra and quantum yields as input variables obtained in the laboratory.

AB - This paper presents first experiments of laboratory investigations of the photodegradation by direct photolysis (λ > 290 am) of cholorotahlonil, dichlobenil, chloroxynil, bromoxynil, and ioxynil in aqueous, pH-buffered, and organic solutions and the calculation of the quantum yields. The photolysis of chlorothalonil in water is low, with a corresponding low quantum yield (Φ = 0.0001). Dichlobenil is photostable under the laboratory conditions used. The photoreactivity of bromoxynil and ioxynil was found to be comparable in aqueous solutions and about three times lower with respect to chloroxynil. The quantum yields obtained in water of chloroxynil, bromoxynil, and ioxynil are Φ = 0.0060, 0.0093, and 0.0024, respectively. Half-lives of the pesticides in the environment with respect to direct irradiation are estimated using UV spectra and quantum yields as input variables obtained in the laboratory.

KW - Chemistry

KW - Benzamides/chemistry

KW - Environmental Pollution

KW - Half-Life

KW - Herbicides/chemistry

KW - Iodobenzenes/chemistry

KW - Nitriles/chemistry

KW - Photolysis

KW - Solvents

KW - Sunlight

UR - http://www.scopus.com/inward/record.url?scp=0031719206&partnerID=8YFLogxK

U2 - 10.1006/eesa.1998.1665

DO - 10.1006/eesa.1998.1665

M3 - Journal articles

C2 - 9756688

AN - SCOPUS:0031719206

VL - 41

SP - 44

EP - 50

JO - Ecotoxicology and Environmental Safety

JF - Ecotoxicology and Environmental Safety

SN - 0147-6513

IS - 1

ER -