Levels of organochlorine pesticides in sediment Surface of a section of the Mololoa river
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Abstract
The main use of Mololoa River is to serve as an irrigation source, but for many years wastewater dump into to the River has come from industrial and domestic activities from the Tepic City, Nayarit, México, and livestock and agricultural origin as well. Recently, 16.2 km. from this river were rectified and channeled to compensate its hydraulic capacity deficiency. These actions resulted into the sediments stir up therefore this research implied the analysis of samples before and after the dreadging looking for contaminants from anthropogenic activities. Considering these data, the aim of this work was to evaluate the contamination exposition level of these sediments with organochlorine pesticides (OCP) and with organic matter (OM). To do this, sediment samples were taken at four selected points (before and after river rectification), named E-1, E-2, E-3 and E-4 on the basis of the possible contaminant source: Agricultural, industrial, urban and suburban respectively. No OCP’s were found in the sediments before the river was dreadged, however alpha, beta, gamma and delta-HCH, dieldrín, endosulfan II, endrin aldehyde and p,p´-DDT were found in sediments after river dreadging. These results imply that OCP’s were used some years ago, and they were exposed when the river was dreadged. OCP’s concentrations were higher at E-1 < E-2 < E-3 < E-4, according to the flow, suggesting that OCP level at E-4 is due to an accumulative effect from sources located upstream. Significant correlation between organic matter and OCP’s level was found. OCP’s levels detected were significantly lower than those reported for other rivers in Mexico and the world.
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References
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