การปนเปื้อนของสารโพลีไซคลิกอะโรมาติกไฮโดรคาร์บอนที่บันทึกในตะกอนดินนอกชายฝั่งอันดามัน และอ่าวไทยตอนในฝั่งตะวันออก

Abstract

The aims of this study was to investigate the temporal distribution, level of accumulation and source identification of PAHs in sediment cores. Three sediment cores were collected using a Gravity corer from near shore sediment off the Andaman coast area: 2 sediment cores from (Khaolak and Thub lamu coastal) and 1 sediment core from the eastern inner Gulf of Thailand. Quantitative analysis of 15 PAHs in sediment were performed by soxhlet extraction and the PAHs level was determined by GC-MS. Moreover, the multi-techniques such as diagnostic ratios and principle component analysis were applied to apportion the potential sources of PAHs in the study areas. The results showed that total concentration of 15 PAHs (PAHS15) in Khao lak coastal area and Thub Lamu range from 17.4-48.4 and 20.8-88.5 ng/g dry weight with the average of 29.5±7.21 and 40.8+23.0 ng/g dry weight respectively, Σ PAHS15 from the eastern inner Gulf of Thailand were in the range from 22.6-313 ng/g dry weight with an average of 177+85.7 ng/g dry weight. The diagnostic ratios of PAHs plot among could be used to identify the potential sources of PAHs sources. Source identification using diagnostic PAH ratios indicated that the potential sources of PAHs in three sediment cores most sediment samples originated from pyrogenic sources. The level of contamination of PAHs sediment in the eastern inner Gulf of Thailand was higher than the near shore sediment off Andaman coast. Moreover, the sediment accumulation rate was studied using 210pb sediment depth profile to analyse temporal distribution in sediment cores can be calculated back to 141 and 83 years in sediment cores from Khaolak and the eastern inner Gulf of Thailand, respectively.