การสะสมของสารโพลีไซคลิกอะโรมาติกไฮโดรคาร์บอนในแท่งตะกอนดินทะเลน้อยและทะเลสาบหนองหานกุมภวาปี

Abstract

Analysis of types and quantities of 15 PAHs (including Phenanthrene, Anthracene, Flouoranthene, Pyrene, 11HBenzo[a]Fluoranthene, 11HBenzo[b] Fluoranthene, Benzo[a]Anthracene, Chrysene, Benzo[b]Fluoranthene, Benzo[k] Fluoranthene, Benzo[a]Pyrene, Benzo[e]Pyrene, Benzo[g,h,i]Perylene, Dibenzo[a,h] Anthracene and Indeno[1,2,3-cd]pyrene) in 73 sediment core samples from Thalenoi and 62 samples from Nonghankumpawapi Lake. By analyzing the relationships of elements deposited in the sediment through time at different depths, the sources of PAHs can be determined. The sediment extraction process was carried out by the soxhlet method using dichloromethane (DCM) as solvent, and then took to intensity measurement by GC-MS concentrations. Total concentration of PAHs (Σ PAHs) in Thalenoi sediment ranged from 169-1,217, 20-169, 19-167 ng/g dry weight for station SL1, SL2, SL3 respectively. Whereas, ΣPAHs in sediments core from Nonghankumpha wapi Lake ranged from 242-1,111, 170-394, 110-650 ng/g dry weight for station HK1, HK2, HK3 respectively. Source identification using diagnostic PAH ratios indicated composition of PAHs in sediment samples were characterized by pyrogenic source and petrogenic respectively. From the result of disaster that happened in Thalenoi during 1961-1979 found the El Nino almost every year. The result showed the drought is longer than usually and it affacted to forest fire in 1965 at Thalenoi area. Nonghankumphawapi Lake assumed from the geochemical of organic matter from the past. The result found a lot of fragments of charcoal that made from biomass burning and related with the dry weather from that time its affacted to forest fire during the period early holocene.