Photolysis of Atrazine and Ametryne Herbicides in Barbados Sugar Cane Plantation Soils and Water

The photodegradation kinetics of atrazine (2‐chloro‐6‐(ethylamino)‐4‐isopropylamino‐1,3,5‐triazine) and ametryne (2‐methylthio‐4‐ethylamino‐6‐isopropylamino‐s‐triazine), in fresh and coastal salt water from Barbados, were measured under irradiation with artificial solar and UV254‐radiation. The first‐order rate constants were greater for ametryne than for atrazine, and the rates were reduced in seawater relative to fresh water, and in soil slurries relative to fresh water. However, rates were accelerated in the presence of iron(III) at pH 3 due to photo‐Fenton type processes. This rate enhancement was reduced at ambient pH values (pH 7–7.5) representative of surface water in Barbados. These results have important implications for the relative persistence of these contaminants in aquatic environments in tropical areas.

[1]  F. Gumbs,et al.  DISTRIBUTION AND OCCURRENCE OF ATRAZINE, DEETHYLATRAZINE, AND AMETRYNE RESIDUES IN GROUNDWATER OF THE TROPICAL ISLAND BARBADOS , 2002 .

[2]  S. Huling,et al.  Predicting Fenton-driven degradation using contaminant analog , 2000 .

[3]  B. Sulzberger,et al.  Atrazine Degradation in Irradiated Iron/Oxalate Systems: Effects of pH and Oxalate , 1999 .

[4]  C. J. Hapeman,et al.  Structural influences of low‐molecular‐weight dissolved organic carbon mimics on the photolytic fate of atrazine , 1998 .

[5]  P. Ansart,et al.  Seasonal transport of herbicides (triazines and phenylureas) in a small stream draining an agricultural basin: Mélarchez (France) , 1997 .

[6]  C. J. Hapeman,et al.  Atrazine Photolysis: Mechanistic Investigations of Direct and Nitrate-Mediated Hydroxy Radical Processes and the Influence of Dissolved Organic Carbon from the Chesapeake Bay , 1997 .

[7]  W. Palm,et al.  Investigation of the photochemistry and quantum yields of triazines using polychromatic irradiation and UV-spectroscopy as analytical tool , 1996 .

[8]  S. Yen,et al.  Pesticides in ground water : Do atrazine metabolites matter ? , 1996 .

[9]  F. Beltrán,et al.  Aqueous uv radiation and uv/h2o2 oxidation of atrazine first degradation products: Deethylatrazine and deisopropylatrazine , 1996 .

[10]  G. Mascolo,et al.  Degradation of sulphur containing s-triazines during water chlorination , 1994 .

[11]  R. Kanwar,et al.  Persistence and degradation of [14C]atrazine and [14C]deisopropylatrazine as affected by soil depth and moisture conditions , 1993 .

[12]  W. Huber,et al.  Ecotoxicological relevance of atrazine in aquatic systems , 1993 .

[13]  D. M. Sievers,et al.  Survey of Rural Wells in Missouri for Pesticides and Nitrate , 1992 .

[14]  L. L. Piper,et al.  Results of the National Alachlor Well Water Survey , 1992 .

[15]  K. Mopper,et al.  Formation of carbonyl compounds from UV‐induced photodegradation of humic substances in natural waters: Fate of riverine carbon in the sea , 1990 .

[16]  C. Minero,et al.  DEGRADATION OF ATRAZINE IN SOIL THROUGH INDUCED PHOTOCATALYTIC PROCESSES , 1990 .

[17]  C. Namasivayam,et al.  Errors in ferrioxalate actinometry , 1983 .

[18]  Murray T. Brown,et al.  Transmission spectroscopy examinations of natural waters: C. Ultraviolet spectral characteristics of the transition from terrestrial humus to marine yellow substance , 1977 .

[19]  C. A. Parker,et al.  A new sensitive chemical actinometer - II. Potassium ferrioxalate as a standard chemical actinometer , 1956, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[20]  B. L. Hoyle,et al.  Biodegradation and Mineralization of Atrazine in Shallow Subsurface Sediments from Illinois , 1999 .

[21]  T. Clair,et al.  Environmental variability in the reactivity of freshwater dissolved organic carbon to UV-B , 1997 .

[22]  E. Thurman,et al.  Occurrence of selected pesticides and their metabolites in near-surface aquifers of the Midwestern U , 1996 .

[23]  N. K. Højerslev,et al.  Yellow Substance in the Sea , 1982 .

[24]  J. Stark.  Soil and land-use surveys No. 15. Jamaica. Parish of Westmoreland. , 1964 .