R=0.08206Latmmol1K1:R=8.314Pam3mol1K1:0C=273K:NAv=6.02x1023: Mass atmosphere =5.11021g : Average Mol. Wt. atmosphere =29.0gmol1 : 1t= tonne =1106g:1Gt= Gigatonne =11015g:1Tg=11012g:1m3=1000L=1106cm3 : 1L water =1kg:1ppq=1pg/L=11012g/L Cx=fxZxf=ZxVxntotalTEQ=i[Xi]TEFXiKow=[X](water)[X](cctanol)C=C0ekttavg=1/kt1/2=0.693/kCss=R/k=RtavgKH=PX[X](aq)(Latmmol) 1) The pesticide atrazine (M.Wt. 215.68g/mol,logKow=2.6 ) has been banned in most of Europe, but is still used in North America. a) A typical concentration of atrazine in Lake Ontario is 4.21010M. Determine the concentration in ppt. ( 1 mark) b) What concentration (in ppb) would be expected in the fatty tissues of fish swimming in Lake Ontario, assuming equilibrium? (2 mark) c) Do you expect to see toxicity in the fish, given that the chronic toxicity threshold (LOEC) is about 1mg/kg ? (I mark) d) Atrazine is not expected to bioaccumulate significantly through the food web, but there is still concern about atrazine. What property of atrazine leads to this concern and in what environmental compartments is it found to be causing problems in Europe? ( 1 mark)