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Photolytic degradation of quinalphos in natural waters and on soil matrices under simulated solar irradiation.
Chemosphere. 2006 Aug; 64(8):1375-82.C

Abstract

The photochemical persistence of quinalphos, one of the most widely used organophosphorous insecticides, was investigated in a variety of environmental matrices such as natural waters and soils of different composition. Simulated solar irradiation was obtained using a xenon arc lamp (Suntest CPS+ apparatus) giving an irradiation intensity of 750 W m(-2) equivalent to a light dose per hour of irradiation of 2,700 kJ m(-2). The phototransformation rates were determined using solid-phase microextraction (SPME) and ultrasonic extraction (USE) coupled to GC-FTD, while the identification of photoproducts was carried out by GC-MS. In water samples, the degradation kinetics followed a pseudo-first-order reaction and photolysis half-lives ranged between 11.6 and 19.0 h depending on the constitution of the irradiated media. Dissolved organic matter (DOM) has a predominant retarding effect, while nitrate ions accelerated the photodegradation kinetics. In soil samples, the degradation kinetics was monitored on 1mm soil layer prepared on glass TLC plates. The kinetic behaviour of quinalphos was complex and characterized by a double step photoreaction, fast in the first 4h of irradiation followed by a slow degradation rate up to 64 h. The photolysis half-life of quinalphos was shorter in sandy soil compared to the rest of the soil samples, varying between 16.9 and 47.5 h, and showing a strong dependence on the composition of the irradiated media. Among the transformation products formed mainly through photohydrolysis and photoisomerization processes, some photoproduct structures were proposed according to their mass spectral information.

Authors+Show Affiliations

Laboratory of Hydrology, Faculty of Pharmacy, University of Porto, Rua Aníbal Cunha 164, 4050-047 Porto, Portugal.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

16469359

Citation

Gonçalves, C, et al. "Photolytic Degradation of Quinalphos in Natural Waters and On Soil Matrices Under Simulated Solar Irradiation." Chemosphere, vol. 64, no. 8, 2006, pp. 1375-82.
Gonçalves C, Dimou A, Sakkas V, et al. Photolytic degradation of quinalphos in natural waters and on soil matrices under simulated solar irradiation. Chemosphere. 2006;64(8):1375-82.
Gonçalves, C., Dimou, A., Sakkas, V., Alpendurada, M. F., & Albanis, T. A. (2006). Photolytic degradation of quinalphos in natural waters and on soil matrices under simulated solar irradiation. Chemosphere, 64(8), 1375-82.
Gonçalves C, et al. Photolytic Degradation of Quinalphos in Natural Waters and On Soil Matrices Under Simulated Solar Irradiation. Chemosphere. 2006;64(8):1375-82. PubMed PMID: 16469359.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Photolytic degradation of quinalphos in natural waters and on soil matrices under simulated solar irradiation. AU - Gonçalves,C, AU - Dimou,A, AU - Sakkas,V, AU - Alpendurada,M F, AU - Albanis,T A, Y1 - 2006/02/15/ PY - 2005/02/14/received PY - 2005/12/02/revised PY - 2005/12/15/accepted PY - 2006/2/14/pubmed PY - 2006/10/14/medline PY - 2006/2/14/entrez SP - 1375 EP - 82 JF - Chemosphere JO - Chemosphere VL - 64 IS - 8 N2 - The photochemical persistence of quinalphos, one of the most widely used organophosphorous insecticides, was investigated in a variety of environmental matrices such as natural waters and soils of different composition. Simulated solar irradiation was obtained using a xenon arc lamp (Suntest CPS+ apparatus) giving an irradiation intensity of 750 W m(-2) equivalent to a light dose per hour of irradiation of 2,700 kJ m(-2). The phototransformation rates were determined using solid-phase microextraction (SPME) and ultrasonic extraction (USE) coupled to GC-FTD, while the identification of photoproducts was carried out by GC-MS. In water samples, the degradation kinetics followed a pseudo-first-order reaction and photolysis half-lives ranged between 11.6 and 19.0 h depending on the constitution of the irradiated media. Dissolved organic matter (DOM) has a predominant retarding effect, while nitrate ions accelerated the photodegradation kinetics. In soil samples, the degradation kinetics was monitored on 1mm soil layer prepared on glass TLC plates. The kinetic behaviour of quinalphos was complex and characterized by a double step photoreaction, fast in the first 4h of irradiation followed by a slow degradation rate up to 64 h. The photolysis half-life of quinalphos was shorter in sandy soil compared to the rest of the soil samples, varying between 16.9 and 47.5 h, and showing a strong dependence on the composition of the irradiated media. Among the transformation products formed mainly through photohydrolysis and photoisomerization processes, some photoproduct structures were proposed according to their mass spectral information. SN - 0045-6535 UR - https://www.unboundmedicine.com/medline/citation/16469359/Photolytic_degradation_of_quinalphos_in_natural_waters_and_on_soil_matrices_under_simulated_solar_irradiation_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(05)01459-1 DB - PRIME DP - Unbound Medicine ER -