The Impact of Pesticides - Academy Publish

All of the iprobenfos and isoprothiolane concentrations in the river water from 1988to 2007 were less than the NOEC values of algae, waterflea and fish (Fig.21). Forthe initial risk assessment, all of the isoprothiolane concentrations were less than thePNEC value (10 μg/L). However, the iprobenfos concentrations in 1988 and 1990exceeded the PNEC value (1 μg/L) and those in 1992 and 2007 were less than thevalue.Fig. 22 Yearly maximum concentrations of four herbicides in Yanamune Riverwater and their NOEC and PNEC valuesThiobencarbMolinateConcentration (μg/L)10001001010.10.010.24 0.282.70.270.090.01ND17200 1100.17Concentration (μg/L)10001001010.10.010.4876193.60.930.02220SimetrynePretilachlorConcentration (μg/L)1000100101263920816212.5 3.04.6351000Concentration (μg/L)10001001010.15.1 3.78.72.00.580.32100300All of the thiobencarb concentrations in the river water were less than the NOECvalues of algae, waterflea and fish and all of the molinate concentrations were lessthan the NOEC values of algae (Fig. 22). In the other countries, the molinateconcentrations were