การกระจายของปรอทบริเวณอ่าวปากพนัง จังหวัดนครศรีธรรมราช / นภฤกษ์ วัฒนวิทูกูร = Mercury distribution in Pakpanang Bay, Nakhon Si Thammarat Province / Napalerk Wattanavitukul
Study of mercury distribution in Pakpanang bay showed that the mean concentrations of total mercury in Pakpanang river, Bangchak canal, Paknakhon canal and Pakphaya canal water were higher than the total mercury in Pakpanang bay. The average concentration in the rivers following into Pakpanang bay were 1.80+-1.31 and 1.21+-0.48 ng/L, respectively. Most of them were in non-reactive form. Concentrations of total mercury in sediment from the rivers were also higher than those from Pakpanang bay. Concentrations in the rivers and the bay were 0.05-0.73 and 0.05-0.36 microgram/g dry weight, respectively, Higher concentrations of total mercury in sediment were found at stations upstream. The study of mercury distribution in economic marine organisms showed that concentrations of total mercury in fish were higher than invertebrates. Total mercury concentrations in fish and invertebrates were 0.08-0.69 microgram/g wet weight and 0.05-0.07 microgram/g wet weight, respectively.In this study. The mercury concentrations in water samples were not higher than guideline values for the marine environment. However, some sediment and fish samples were higher than the guideline values. Concentration of total mercury in water samples had a positive correlation with suspended particulate matter (SPM) and total organic carbon (TOC) while concentration of total mercury in sediment samples had a positive relationship with organic matter in sediment. No correlation between mercury and arsenic concentration in water, sediment and marine organism sample were observed indicating that mercury and arsenic came from different sources.
