Agrochemical loading in drains and rivers and its connection with pollution in coastal lagoons of the Mexican Pacific.

摘要: The state of Sinaloa in Mexico is an industrialized agricultural region with a documented pesticide usage 700 t year−1; which at least 17 the pesticides are classified as moderately to highly toxic. Pollutants water column rivers and drains great concern because flows into coastal lagoons nearshore waters thereby affects aquatic organisms. This study was done four municipalities that produce food intensively. To investigate link between pollution their proximity sites, sampled three flow them. Seawater from Gulf California, 10 km coast, also analyzed. Concentrations nutrients, organochlorines, organophosphorus were determined. Nutrient determination showed unhealthy environment N/P ratios <16, thus favoring nitrogen-fixing cyanobacteria. organochlorine clear accumulation rivers, ΣHCH showing highest concentrations. In southern part studied, lagoon Pabellones could be traced mainly sites. Accumulation OC observed California. Tests for 22 organophosphates revealed only five (diazinon, disulfoton, methyl parathion, chlorpyrifos, mevinphos); diazinon detected all although parathion present some sites concentrations one order magnitude higher than diazinon.