원각사지 십층석탑 오염물의 유기산 분석
Analysis of the Organic Acid Contaminants on the surface of TEN-STORIED STONE PAGODA ON THE SITE OF WON-GAKSA
- Lee, Kyu-Shik (Conservation Science Dept. National Research Institute of Cultural Properties) ;
- Han, Sung-Hee (Conservation Science Dept. National Research Institute of Cultural Properties)
- 발행 : 1995.12.15
초록
TEN-STORIED STONE PAGODA ON THE SITE OFWON-GAKSA(Temple) which is one of three marble pagodas in South Korea, were dated from the thirteenth year of the reign of King Sejo(1467). On the roof and surface of each the stories, there were large amount of the contaminants such as pigeon′s excretions, dust and environmental elements for a long time. The pH of contaminants is not acid, but is 7.2, neutral. To find the species of organic acidscontained in the contaminants and the degree of damaging for a marble pagoda, we analyzed the contaminants using GC-MSD method by the following procedures. Organic acids were extracted by saponifying whole contaminants. After Saponification, the organic acids were mathylated to increase their volatility upon subsequent GC-MSD analysis. The mathyl esters of the organic acids are extracted from the acidified aqueous solution. And the organic extracts were washed with adilute base solution. The washed extract were analyzed by GC(Hewlett Packard 5890)with a nonpolar capillary column(Crosslinked 5% Ph Me Silicone,
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