• 한국지반공학회:학술대회논문집
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• 한국지반공학회 1999년도 봄 학술발표회 논문집
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• pp.543-550
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• 1999

Hazardous substances produced from industrial sectors have caused serious contamination of soils and groundwater. The hydrophobic organic compounds in the subsurface are hard to be decomposed, and as they soil on the soil or last as a NAPL they might contaminate the groundwater for a long time. Although we recognize the danger of contaminated subsurface, very little was known about the effective remediation technique. This paper focuses on the remediation of the p-Cresol which contaminated subsurface by applying the surfactant-enhanced description technique. Sorption characteristics of soils and organic compounds are studied, and the applications of surfactant solution are studied for effective rededication. The results from this study could be used as some data for surfactant-enhanced rededication. The flexible-wall permeameter tests are performed in which in-situ remediation is simulated. Results show that triton X-100 at 2% solution disrobes p-Cresol 1.7 times as much as water description in the flexible-wall permeameter tests.

• 한국환경과학회지
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• 제6권2호
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• pp.153-163
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• 1997

In order to fad the most fitted biodegradation model, biodegradation kinetics model to the initial phenol and p-cresot concentrations were investigated and had been fitted by the linear regression. Bacteria capable of degrading p-cresol were isolated from soil by enrichment culture technique. Among them, strain Ml capable of degradillg p.rcresol has also degraded phenal and was identified as the genus Micrococcus from the results from of taxonomical studies. The optimal tonditlons for the biodegradation of phenal and p-cresol by Micrococcus sp. Ml were $NH_4NO_3$ 0.05%, pH 7.0, 3$0^{\circ}C$, respectively, and medium volume 100m1/250m1 shaking flask. iwicrococcus sp. Ml was able to grow on phenal concentration up to 14mM and p-cresol concelltration up to 0.8mM. With increasing substrate concentraction, the lag period increased, but the maximum specific growth rates decreased. The yield coefficient decreased with increasing substrate concentation. The biodegradation kinetics of phenol and p-cresol were best described by Monod with growth model for every experimented concentration. In cultivation of mixed substrate, p-cresol was degraded first and phenol was second. This result implies that p-cresol and phenol was not degraded simultaneously.

• 대한화학회지
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• 제43권3호
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• pp.257-263
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• 1999

2,6-diformyl-p-creso1(DFPC)로부터 합성한 Ln-거대고리([20]DOTA) 착물, [Ln([20]DOTA)(NO3)(H2O)](NO3)2 xH2O{Ln(III)=Pr, Sm, Gd, Dy}를methanol용매에 2일정도 정치함으로써 [Ln([20]DOTA)(NO3)(CH3OH)]2+을 얻을 수 있다. 이 lanthanide-거대고리 착물에서 배위 된 CH3OH이 주게원자가 N인 보조리간드,La(=한자리 리간드;pyidine, imidazole, triethylamine, diethylamine, piperidine)에 의해 치환될 때 평형상수(K)를 25 oC, ㅒ=0.1M에서 분광학적 방법으로 결정하였다. 보조리간드의 pKa는 pyridine