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(conversion of p,p'-DDT to p,p'-DDE). <br /> Environmental Fate Rate Constants or Half L ives: <br /> Volatilization: Half-life of 3.7 d for water depth of 1 m, from soil w/ h-1 of 578 11 <br /> Oxidation: Photooxidation half-life of 168-8400 h in water, 17.7-177 h in air <br /> Hydrolysis: Estimated first-order half life of 22 yr <br /> Biodegradation: Aqueous aerobic half-life of 2-15.6 yrs <br /> DDE. Common name: DDE (p,p'-DDE; o,p'-DDE), product of DDT degradation. <br /> Half-lives in the environment: <br /> Air: Atmos, transformation lifetime est. to be < I d. <br /> Surface iaater: Hydrolytic half-life of >120 yr, est. half-life >300 d in lakes. <br /> Groundwater: NIA <br /> Sediment: NIA <br /> Soil: Field half life of 1000 d <br /> Biota: Elimination half-life of 340 d (rainbow trout), 300 d for birds. <br /> Environmental Fate Rate Constants or Half-Lives: <br /> Volatilization: N/A <br /> Oxidalion: NIA <br /> Hydrolvsis: >120 yr Biodegradation: NIA <br /> DDD. Common name: DDD, TDE (tetrachlorodiphenylethane), product of DDT deg. <br /> Ilalf-lives in the environment: <br /> Air: 17.7-177 h <br /> Surface water: 2-15.6 yr. <br /> Groundwater: 1680-270,000 h based on anaerobic soil study data <br /> Sediment: NIA <br /> Soil: Field half life of 2-15.6 yrs based on observed rates of biodeg. of DDT <br /> Biota: 119 hr in mussels. <br /> Environmental Fate Rate Constants or Half-Lives: <br /> Volatilization: Aquatic approx. 1 mo. <br /> Oxidation: Aquatic half-life approx. 22 yr <br /> Hydrolysis: half-life of 570 d @ pH 9 and 190 yr @ pl-I 5 <br /> Biodegradation: Aqueous aerobic half-life of 2-15.6 yr <br /> Page -5- <br /> Chesney Consufting <br />