薄膜液晶顯示器工業產生的汙泥中含有一定量的稀有元素，如鉭、鉬、鍶、銦等。這些稀有元素具有特殊特性與毒性，於污泥的再利用或最終處置過程中可能造成環境與人體危害。此研究的目的為透過連續萃取實驗與生物有效性分析來了解稀有元素在污泥中的型態，並評估其在環境中的釋放行為。連續萃取實驗結果顯示鉬與鍶在汙泥中屬於不易流動型態，而銦與鉭則是趨向於流動型態。而生物有效性分析結果也顯示鉬與鍶屬於低生物可利用性，而銦具有生物可利用性。而在鉭的部份，則是發現二乙烯三胺五乙酸(DTPA)與乙二胺四乙酸(EDTA)對與鉭之萃取效率不佳。硝酸萃取實驗結果顯示，鍶與銦的萃取率達80%，鉬為50%，鉭約10%。

The inorganic sludge from thin-film transistor liquid crystal display (TFT-LCD) industry contains significant levels of rare elements, such as tantalum, molybdenum, strontium and indium. This study investigated the associated speciation and bioavailability of rare elements in TFT-LCD inorganic sludge. The sequential extraction results indicated that strontium and molybdenum were of immobile form, while tantalum and indium were relatively mobile. The bioavailability analysis results also showed that strontium and molybdenum were not bioavailable, and indium was potentially available for plant uptake. However, the bioavailability of tantalum by DTPA/EDTA method may not be suitable, and it deserves further research to find appropriate chemicals for tantalum. The nitric acid extraction results showed that leaching percentage of strontium and indium were nearly 80%, 50% for molybdenum, and 10% for tantalum.

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