The Impact of Pesticides - Academy Publish

The Aggravating Factor is dimensionless. Given the role that the AggravatingFactor has in the model, it was decided to disregard the units, only considering theabsolute valuesmaking it a risk multiplier. The maximum persistence possible valueis 5 and 5 is an extreme value for log BCF. The Aggravating Factor, in situations ofhigh persistence and high bioconcentration potential, could enhance up to 10 timesor even more the health and the biota risk value. However, this factor onlyaggravates the situation if there is a risk to health or biota, for which the clause thatwill only work if Human Health Risk or Biota Health Risk 1 was established.Therefore, when Human and Biota Health Risk 1, Aggravating Factor = 1.Applying the DelAzulPestRisk modelConcentration of agrochemicals in waterA preliminary study on the presence of agrochemicals in the waters of the Del Azulcreek (12 samples from eight sites in the stream, see Figure 2, taken bimonthlybetween December 2005 and December 2007), revealed the presence oforganochlorine pesticides (α-HCH, β-HCH, γ-HCH, δ-HCH, Aldrin, γ-Chlordane,Endosulfan, Endosulfan Sulphate, Heptachlor), pyrethroids (Cypermethrin) andorganophosphorus (Chlorpyrifos) and herbicides (2,4-D, Acetochlor, Glyphosate)(Peluso et al., 2011b).Figure 2. Location of sampling stations in the waters of the Del Azul creek(reproduced with permission of Taylor and Francis Publishing Co.)AcademyPublish.org - The Impact of Pesticides249