Abstract
Abstract [14C]DDT persistence and movement was monitored for 25 months after treatment of in‐situ soil columns in Hawaii, USA. This was part of an international collaborative protocol coordinated by the International Atomic Energy Agency and carried out at 13 tropical locations. DDT metabolite DDE, and herbicide tebuthiuron, were included in the Hawaiian test for comparison with DDT. Persistence based on overall loss of radioactivity was described by first‐order and two‐compartment models: half‐dissipation times were 53 and 25 weeks, respectively. The second model represented more accurately the rapid loss of 14C during the first month after treatment. Time to 50% loss based on analysis of methanol‐extractable 14C was 66–68 weeks (both models), or somewhat shorter (40–53 weeks) when 14C was measured in the final hexane solution before gas chromatographic (GC) analysis. Direct GC analysis of that solution gave 24 weeks (first‐order) and 13 weeks (two‐compartment) for DDT alone, and 30 weeks and 27 weeks, r...
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