Chemical and biological release of 14C-bound residues from soil treated with 14C-p,p'-DDT

Abstract

14 C-p,p'-DDT-bound residues in soil can be released by treatment with concentrated sulphuric acid at ambient temperatures. Within 6 days, about 70% of the bound residues was released. Bound residues released after 9 months incubation with 14 C-DDT showed the presence of DDT and DDE only while bound residues released after 18 months, contained in addition 13% DDD.Release of bound 14 C-residues also occurs readily following inoculation of the soil-bound residues with fresh soil or with individual microorganisms.Almost complete release of bound residues was observed after incubation for 45 days. The rate of release was rapid during the first two weeks and decreased thereafter. TLC and HPLC analysis showed that the released residues contained DDE (about 80%) and a smaller amount of DDD. The disappearance of DDT from the released residues may be attributed to its microbiological degradation to DDE and DDD, shortly after its release.

Effect of species differences, pollutant concentration, and residence time in soil on the bioaccumulation of 2,2‐BIS (p‐chlorophenyl)‐1,1‐dichloroethylene by three earthworm species

“…Although it is designated a persistent organic pollutant [26], DDT is subject to microbiological conversion to p,pЈ-DDE or dichlorodiphenyldichloroethane (DDD) [27,28], both of which are themselves persistent pollutants of environmental concern [26]. The organochlorine pesticide DDT was applied extensively to agricultural fields in the United States until it was banned by the U.S. Environmental Protection Agency in 1970.…”

“…The organochlorine pesticide DDT was applied extensively to agricultural fields in the United States until it was banned by the U.S. Environmental Protection Agency in 1970. Although it is designated a persistent organic pollutant [26], DDT is subject to microbiological conversion to p,pЈ-DDE or dichlorodiphenyldichloroethane (DDD) [27,28], both of which are themselves persistent pollutants of environmental concern [26]. In fact, p,pЈ-DDE has been implicated in structural anomalies in the reproductive organs of piscivorous birds inhabiting regions around the Great Lakes (North America) [29], and these alterations likely resulted in eggshell thinning and offspring inviability [30].…”

Dissipation Behavior of 14C-Deltamethrin in Egyptian Soil Columns in Absence and Presence of Chlorpyrifos under Subtropical Conditions

“…The soil surface photolysis may, also accelerate the dissipation of the pesticide under field conditions [35]. Also, the soil microorganisms are believed to play an important role in the release and further degradation of bound residues of organochlorine (DDT) [36,37].Organophosphorus (chlorpyrifos) [38] and herbicides (prometryn) [39].…”

Dissipation Behavior of 14C-Deltamethrin in Egyptian Soil Columns in Absence and Presence of Chlorpyrifos under Subtropical Conditions

“…The soil surface photolysis may, also accelerate the dissipation of the pesticide under field conditions [35]. Also, the soil microorganisms are believed to play an important role in the release and further degradation of bound residues of organochlorine (DDT) [36,37].Organophosphorus (chlorpyrifos) [38] and herbicides (prometryn) [39].…”