SciELO - Scientific Electronic Library Online

vol.22 issue1Association of respiratory symptoms with atmospheric and climatic factors in adults in Santa Marta, ColombiaBarber and Johnson diagram for the analysis of the hospital bed management in Costa Rica author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links

  • Have no similar articlesSimilars in SciELO


Revista Costarricense de Salud Pública

Print version ISSN 1409-1429


MORALES VARGAS, Ricardo. Risk analysis methodology for agrochemical contamination: San Blasriver basin, Costa Rica. Rev. costarric. salud pública [online]. 2013, vol.22, n.1, pp.34-44. ISSN 1409-1429.

Objective: To establishsoil and hydrogeological parameters for the basin; as well as fertilizer and pesticide physical and chemical parameters that could be used to analyze their risk of percolation. Materials and methods: A field and literature survey was conducted to characterize the basin from a hydrogeological standpoint. The concentration of nitrates and pesticides in ground water and surface water was analyzed. Some of the intrinsic vulnerability characteristics of the aquifer were considered, in particular those related to adsorption and retention of contaminants and those related to chemical characteristics of the soil. The distribution coefficient and retardation value were determined for six agrochemicals of high use in the basin, in order to establish their relative risk to groundwater. The Pearson correlation coefficient was calculated for nitrate concentration in groundwater and the diverse soil parameters considered. Results: Groundwater in agricultural are as has two to three times the nitrate concentration relative to that of groundwater in wells for human consumption. Glyphosate was foundin agricultural irrigation canals. The soil chemical parameters morestrongly related to contaminant (nitrates)inground water were: a) cation exchange capacity, b) aluminum/silicon ratio,c) % soil nitrate retention, and d) soil pH using distilled water.The sum of fines (% clay + % silt) was found to directly relate to groundwater nitrate concentration. Discussion: Parameters are proposed for risk analysis in alluvial aquifers in the Pacific coast of Costa Rica, where agricultural use is predominant. Terbutylazine, ametryn, carbendazim, diuronand nitrates representan important threat to the aquifer.

Keywords : aquifer; risk; vulnerability; pesticides; nitrates; Costa Rica.

        · abstract in Spanish     · text in Spanish     · Spanish ( pdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License