TY - JOUR
T1 - Seasonal exposures to triazine and other pesticides in surface waters in the western Highveld corn-production region in South Africa
AU - Du Preez, L. H.
AU - Jansen Van Rensburg, P. J.
AU - Jooste, A. M.
AU - Carr, J. A.
AU - Giesy, J. P.
AU - Gross, T. S.
AU - Kendall, R. J.
AU - Smith, E. E.
AU - Van Der Kraak, G.
AU - Solomon, K. R.
N1 - Funding Information:
We thank A. Hosmer for many helpful comments on experimental design. We thank Robert Sielken and Larry Holden for statistical support. We also thank Cathy Bens for QA and Robert Bruce and Susanne Williamson for technical support. This research was conducted under the oversight of the Atrazine Endocrine Ecological Risk Assessment Panel, Ecorisk, Inc., Ferndale, WA with a grant from Syngenta Crop Protection, Inc.
PY - 2005/5
Y1 - 2005/5
N2 - The objective of this study was to characterize concentrations of atrazine, terbuthylazine, and other pesticides in amphibian habitats in surface waters of a corn-production area of the western Highveld region (North-West Province) of South Africa. The study was conducted from November 2001 to June 2002, coinciding with the corn-production season. Pesticide residues were measured at regular intervals in surface water from eight ponds, three in a non-corn-growing area (NCGA) and five within the corn-growing area (CGA). Measured atrazine concentrations differed significantly among sites and between samples. In the five CGA sites, the maximum atrazine concentrations measured during the study ranged from 1.2 to 9.3 μg/L. Although no atrazine was recorded as being applied in the catchment of the three NCGA sites, maximum concentrations from 0.39 to 0.84 μg/L were measured during the study, possibly as a result of atmospheric transport. Maximum measured concentrations of terbuthylazine ranged from 1.22 to 2.1 μg/L in the NCGA sites and from 1.04 to 4.1 μg/L in the CGA sites. The source of terbuthylazine in the NCGA sites may have been in use other than in corn. The triazine degradation products, deisopropylatrazine (DIA) and deethylatrazine (DEA) and diaminochlorotriazine (DACT) were also found in water from both the CGA and NCGA sites. Concentrations of DIA were ≥ 1 μg/L throughout the season, while DEA concentrations were mostly <0.5 μg/L before planting but increased after planting and application of herbicides to concentrations > 2 μg/L in some locations. Concentrations of DACT were highly variable (LOD to 8 μg/L) both before and after planting and application, suggesting that they resulted from historical use of triazines in the area. Other herbicides such as simazine and acetochlor were only detected infrequently and pesticides such as S-metolachlor, cypermethrin, monocrotophos, and terbuphos, known to be used in the CGA, were not detected in any of the samples. Because of dilution by higher than normal rainfall in the study period, these concentrations may not be predictive of those in years of normal rainfall.
AB - The objective of this study was to characterize concentrations of atrazine, terbuthylazine, and other pesticides in amphibian habitats in surface waters of a corn-production area of the western Highveld region (North-West Province) of South Africa. The study was conducted from November 2001 to June 2002, coinciding with the corn-production season. Pesticide residues were measured at regular intervals in surface water from eight ponds, three in a non-corn-growing area (NCGA) and five within the corn-growing area (CGA). Measured atrazine concentrations differed significantly among sites and between samples. In the five CGA sites, the maximum atrazine concentrations measured during the study ranged from 1.2 to 9.3 μg/L. Although no atrazine was recorded as being applied in the catchment of the three NCGA sites, maximum concentrations from 0.39 to 0.84 μg/L were measured during the study, possibly as a result of atmospheric transport. Maximum measured concentrations of terbuthylazine ranged from 1.22 to 2.1 μg/L in the NCGA sites and from 1.04 to 4.1 μg/L in the CGA sites. The source of terbuthylazine in the NCGA sites may have been in use other than in corn. The triazine degradation products, deisopropylatrazine (DIA) and deethylatrazine (DEA) and diaminochlorotriazine (DACT) were also found in water from both the CGA and NCGA sites. Concentrations of DIA were ≥ 1 μg/L throughout the season, while DEA concentrations were mostly <0.5 μg/L before planting but increased after planting and application of herbicides to concentrations > 2 μg/L in some locations. Concentrations of DACT were highly variable (LOD to 8 μg/L) both before and after planting and application, suggesting that they resulted from historical use of triazines in the area. Other herbicides such as simazine and acetochlor were only detected infrequently and pesticides such as S-metolachlor, cypermethrin, monocrotophos, and terbuphos, known to be used in the CGA, were not detected in any of the samples. Because of dilution by higher than normal rainfall in the study period, these concentrations may not be predictive of those in years of normal rainfall.
KW - Atrazine
KW - Corn production
KW - Surface water
KW - Terbuthylazine
UR - http://www.scopus.com/inward/record.url?scp=13444256425&partnerID=8YFLogxK
U2 - 10.1016/j.envpol.2004.09.019
DO - 10.1016/j.envpol.2004.09.019
M3 - Article
C2 - 15701400
AN - SCOPUS:13444256425
SN - 0269-7491
VL - 135
SP - 131
EP - 141
JO - Environmental Pollution
JF - Environmental Pollution
IS - 1
ER -