광양만(光陽灣) 일대 특히 섬진강 하구(河口)에 위치한 양식장 주변에 있어서의 수질(水質), 저질토(底質土) 및 백합(白蛤) 중 유기염소계 농약잔류량을 1974년 5월부터 1975년 5월에 걸쳐 분석한 결과는 다음과 같다. 1) 수질(水質) 중 잔류농약은 계절 및 위치에 따라 변화하였으나 dieldrin> aldrin> ${alpha}-BHC$> ${gamma}-BHC$> endrin> heptachlor> heptachlor epoxide의 순서로 0.48 ng/L의 범위에 존재하였다. 2. 저질토(底質土) 중 잔류농약은 aldrin>dieldrin>${alpha}-BHC$> ${gamma}-BHC$> heptachlor> endrin> heptachlor epoxide의 순서로 $0-10;{mu}g/kg$ (풍건물)의 범위에 존재하였으며 상층토(上層土)보다 하층토(下層土)에 더 많았다. 3. 백합(白蛤) 중 잔류농약은 heptachlor>${gamma}-BHC$>${alpha}-BHC$> aldrin> heptachlor epoxide> dieldrin> endrin의 순서로 $0.1-18;{mu}g/kg$육질(肉質) 생체중(生體重)의 범위에 존재하였으며 3년생(年生)에서 최고치(最高値)에 달한 후 4년(年)째에는 급감(急減)하였다.
The appearance of organochlorine pesticide residues in water, mud and clam (Meretrix lusoria) samples from the lower basin of Seomjin River around the Kwangyang Bay was surveyed to obtain the following results. 1) The concentrations of pesticide residues in the water samples were found to be in the order of dieldrin> aldrin>${alpha}-BHC$> ${gamma}-BHC$> endrin> heptachlor> heptachlor epoxide and in the range of $0-48ng/{ell}$. 2) The concentrations of pesticide residues in the mud samples were found to be in the order of aldrin> dieldrin>${alpha}-BHC$> ${gamma}-BHC$> heptachlor> heptachlor epoxide> endrin, ranging $0-10;{mu}g/kg$ (dry matter), and to be more in lower layer than in upper layer. 3) The concentrations of pesticide residues in the clam samples were found to be in the of order heptachlor> ${gamma}-BHC$> ${alpha}-BHC$> aldrin> heptachlor epoxide> dieldrin> endrin and in the range of $0.1-18;{mu}g/kg$ (edible fresh muscle). The level reached the highest in 3-year old clams and sharply deceased thereafter.
