การสะสมของมลสารอินทรีย์ชนิดสลายตัวยากในดินตะกอนและหอยแมลงภู่ Perna viridis จากบริเวณเอสทูรีแม่น้ำท่าจีน จังหวัดสมุทรสาคร / ดำรงค์ศักดิ์ น้อยเจริญ = Accumulation of persistent organic pollutants in sediments and green mussel Perna viridis from Tachin Estuary Samut Sakhon Province / Damrongsak Noicharoen
Sediment and green mussel (Perna viridis) samples from the Tachin estuary were analysed for persistent organic pollutants (POPs). The samples were soxhlet extracted with dichloromethane for twenty-four hours then followed by silica gel/alumina column chromatograpahy to get rid of interferences. The fractionated POPs were determined by gas chromatographic analysis. Surface sediment samples showed the amount of total-BHC ranged from <0.020-2.589 and <0.020-1.771, total-DDT ranged from 0.269-45.073 and 0.636-6.516, total POPs ranged from 0.981-61.763 (mean = 12.277) and 3.649-100.943 (mean = 6.384) ng/g dry weight in June and November 1998 respectively. There was no significant difference in the total concentration of POPs between June and November 1998. Sediment cores from the mouth of the Tachin River contained total-DDT ranging from <0.017-0.958, 0.399-1.601 and 0.231-0.544, chlordane ranged from <0.122-0.765, 0.202-1.178 and 0.243-1.191, total-BHC ranged from <0.014-1.285, <0.014-0.015 and <0.014-0.724 ng/g dry weight for station TC1, TC2 and TC3 respectively. Total POPs ranged from 0.480-2.488 (mean 0.965), 0.658-1.783 (mean = 1.100) and 0.594-1.896 (mean = 1.273) ng/g dry weight for station TC1, TC2 and TC3 respectively. Mussel samples contained 3 groups of POPs namely, total-DDT ranging from 1.177-2.114 (mean = 1.646) and 0.862-0.932 (mean = 0.897) ng/g wet weight, chlordane ranging from 1.848-1.971 (mean = 1.910) and 2.275-2.774 (mean = 2.525) ng/g wet weight, total-BHC ranging from <0.054-0.092 and <0.054 ng/g wet weight for June and November respectively.