底泥有機質之含量與特殊組成對多溴二苯醚吸持行為之影響; The influence of sediment organic matter content and distinctive composition on the sorption of polybrominated diphenyl ethers

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题名:	底泥有機質之含量與特殊組成對多溴二苯醚吸持行為之影響;The influence of sediment organic matter content and distinctive composition on the sorption of polybrominated diphenyl ethers
作者:	吳雅華;Ya-Hua Wu
贡献者:	環境工程研究所
关键词:	log Kom;有機質含量;多溴二苯醚;吸持行為;Organic matter contant;Sorption;Polybrominated diphenyl ethers;log Kom
日期:	2010-08-23
上传时间:	2010-12-08 13:50:25 (UTC+8)
出版者:	國立中央大學
摘要:	多溴二苯醚因結構穩定、水中溶解度低、不易被破壞且和小顆粒的粒子及煤灰有很強的結合力，故有積蓄在底泥中的傾向，經由檢測研究標的底泥多溴二苯醚含量結果，不論河川水庫底泥皆發現有多溴二苯醚之存在，且濃度均以高溴數之多溴二苯醚為主，顯示高溴數的多溴二苯醚比低溴數更易累積在環境中。為釐清影響多溴二苯醚於水環境中傳輸與宿命的因子，因此利用河川、水庫中具不同有機質特性之底泥進行吸附實驗。實驗結果顯示，河川水庫底泥對多溴二苯醚的吸附等溫線皆呈線性，顯示自然水體中多溴二苯醚以分佈作用吸持至底泥之有機質中。多溴二苯醚之分佈常數K值主要受底泥的來源及有機質含量所影響，而底泥比表面積、平均孔洞直徑對多溴二苯醚之分佈常數K值影響不大。對同一種多溴二苯醚而言，不論河川或水庫中底泥所得之log Kom值大致相同。當底泥有機質含量相同時，log Kom值會受脂肪族碳含量多寡的影響。含不同溴數之多溴二苯醚，其log Kom值隨溴原子數目之增加而上升；含相同溴數、不同苯環位置之多溴二苯醚，其logKom值受化合物之水溶解度及溴原子位置所影響。 Polybrominated diphenyl ethers (PBDEs) have shown strong binding abilities to small particles, such as dust, due to their structure stabilities and low water solubilities. As a result, these compounds tend to accumulate in sediments. When sediments collected from different reservoirs and rivers are subjected to the analysis, the results obtained detected the existence of PBDEs. It is clear from these data that compounds with higher bromine numbers are much more easily been accumulated in the environment than compounds with lower bromine numbers. The main purpose of this study was focused on the major factors that affect the transportation and fate of polybrominated diphenyl ethers in natural water. The adsorption experiment of polybrominated diphenyl ethers was examined by collecting the organic matter under different characteristics of the sediments. The results of this experimental show the adsorption isotherms of PBDEs by sediment is proportional to the distribution and composition of organic matter contents. The partition coefficient K value of PBDEs is strongly affected by the organic matter content of the sediment. The specific surface area, average pore diameter of the sediment do not effect significantly the partition coefficient K value of PBDEs. On the same of PBDEs, regardless of whether the river and reservoir sediments, normalized partition coefficient (Kom) value is similar. When organic matter content of the sediment is same, the log Kom values affected by the amount of aliphatic carbon content. If, the number of bromine atoms of different PBDEs is different, the log Kom value increase as the number of bromine atoms increases.
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