Abstract
토양오염표준공정시험법과 정적 초임계 <TEX>$CO_2$</TEX> 추출방식을 사용하여 환경오염물질로 알려져 있는 토양 중의 PCBs를 분석하였다. 토양오염표준공정시험법에 의한 PCBs의 평균회수율은 25-35%의 범위였으며 표준편차는 10%를 초과하였다. 이와는 대조적으로, 정적 초임계 <TEX>$CO_2$</TEX> 추출방식에 의한 PCBs의 평균회수율은 토양오염표준공정시험법보다도 2-2.5배 높았으며 표준편차는 7% 이내였다. 이러한 결과들은 정적 초임계 <TEX>$CO_2$</TEX> 추출방식이 토양오염표준공정시험법에서 공인된 시료전처리과정을 대체할 수 있을 가능성을 제시하고 있다. <TEX>$40^{\circ}C$</TEX>의 일정한 온도에서 점차적으로 초임계 <TEX>$CO_2$</TEX>의 압력을 1130 psi에서 1196 psi로 증가시킴에 따라 토양으로부터 PCB congener의 회수율도 역시 증가하는 경향을 보였으나, 같은 추출조건(같은 온도와 압력)에서 평형시간(5분과 60분)은 회수율의 어떠한 영향도 주지 않았다. 마지막으로, 각 PCB congener의 회수율은 같은 추출조건에서 PCB의 분자량이나 구조(coplanar versus non-coplanar)와는 관계없이 거의 비슷한 수준의 값을 보였다. Polychlorinated biphenyls (PCBs) known as environmental contaminants in soil were analyzed by the soil pollution standard process test and the static supercritical <TEX>$CO_2$</TEX> extraction mode. It was shown that the percent average recoveries of PCBs by the soil pollution standard process test were ranged in 25-35% and the corresponding standard deviations were above 10%. In contrast, the percent average recoveries of PCBs by the static supercritical <TEX>$CO_2$</TEX> extraction mode were 2-2.5 times higher and standard deviations were within 7%. These results indicate that static supercritical <TEX>$CO_2$</TEX> extraction mode may be a useful alternative to sample pretreatment certified by the soil pollution standard process test. The increasing supercritical <TEX>$CO_2$</TEX> pressure from 1130 psi to 1996 psi at <TEX>$40^{\circ}C$</TEX> enhanced the recovery of all PCB congeners from soil. However, at same Tc and Pc, the equilibrium time (5 versus 60 minutes) had no effect on the recovery of each PCB congener. Finally, similar PCB recoveries were obtained under the same extraction condition, regardless of the molecular weight and structure (coplanar versus non-coplanar) of PCB congeners.
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