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BHCs and DDTs in a 210 Pb dated sedimentary core in Macao estuary were analysed with supercritical CO 2 extraction and GC-ECD. The concentrations of BHCs in the core sediment dated from 1962 ranged from trace level (<MDL) to 82.4 ng/g, and those of DDTs ranged from trace level (<MDL) to 79.0 ng/g. The highest concentrations of both DDTs and BHCs were found in sediment...
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