Studies on degradation of 14C-DDT in the marine environment.
Degradation of 14C-DDT was studied in a marine ecosystem for 60 days and in marine sediments under moist and flooded conditions using a continuous flow system for a period of 130 days. 14C-DDT residues were recovered in sediments of the marine ecosystem at uniform level of 60-65% of the applied 14C-activity throughout the incubation period. DDD was a major metabolite in sediments while DDMU was a major metabolite in clams. Clams brought about substantial degradation of DDT. However, 14C-residues recovered form clams are not suggestive of significant bioaccumulation. In the continuous flow experiment, under both moist and flooded conditions, DDT underwent degradation and about 22% of the applied 14C-activity was recovered as volatiles under both conditions. In sediments, extractable 14C-residues accounted for about 30 and 19% under moist and flooded conditions, respectively. DDT was the major compound in extractable residues as identified by TLC-autoradiographic procedures. More bound residues were formed under flooded than under moist conditions.
Kale
S P
SP
Nuclear Agriculture and Biotechnology Division, Bhabha Atomic Research Centre, Mumbai, India.
Murthy
N B
NB
Raghu
K
K
Sherkhane
P D
PD
Carvalho
F P
FP
D000818:Animals; D001673:Biodegradation, Environmental; D049872:Bivalvia / Q000378:metabolism; D002250:Carbon Radioisotopes; D003634:DDT / Q000378:metabolism*; D003633:Dichlorodiphenyl Dichloroethylene / Q000031:analogs & derivatives / Q000378:metabolism; D003632:Dichlorodiphenyldichloroethane / Q000378:metabolism; D017753:Ecosystem; D056890:Eukaryota / Q000378:metabolism; D019015:Geologic Sediments; D007306:Insecticides / Q000378:metabolism; D010573:Pesticide Residues / Q000378:metabolism; D012623:Seawater
D002250:Carbon Radioisotopes; D007306:Insecticides; D010573:Pesticide Residues; D003633:Dichlorodiphenyl Dichloroethylene; D003634:DDT; D003632:Dichlorodiphenyldichloroethane