薄膜液晶顯示器工業所產生汙泥中的稀有元素可能會造成環境危害。薄膜液晶顯示器無機汙泥中所包含如銦、鉬、鍶、鉭等稀有元素，所以此研究評估藉由氧化還原電位和酸鹼值對稀有元素影響還有其生物有效性。利用不同萃取劑如氯化鈣、硝酸鈉、硝酸銨、乙酸銨等對三種汙泥樣品進行生物有效性分析。分析結果顯示出銦和鉬在薄膜液晶顯示器汙泥中是低生物有效性，銦則是最具有可移動性的元素。
氧化還原電位和酸鹼值實驗結果顯現出銦不管在酸性或鹼性還是有氧或厭氧的環境下都是具有低移動性的性質。鍶在酸性及有氧的環境下，鍶的釋放率會隨著氧化還原電位增加而遞增，但是在鹼性和厭氧的環境下會呈現出低移動性。在鹼性和厭氧的環境下，鉬的釋放率會先隨著氧化還原電位減少而遞減至氧化還原電位為六十毫伏特然後隨著氧化還原電位減少而遞增，在酸性及有氧的環境下呈現出低移動性。鉭在氧化還原電位和酸鹼值實驗以及生物有效性分析中，都是呈現出低可利用性，因為鉭在薄膜液晶顯示器汙泥的總金屬含量太低。

Rare metals in sludge from thin film transistor liquid crystal display (TFT-LCD) industry may pose risks to the environment. This study investigated the effect of redox/pH and bioavailability for rare metals , such as In, Mo, Sr, Ta in TFT-LCD inorganic sludge. Three sludge samples were extracted with 0.01M CaCl2, 0.1M NaNO3, 1M NH4NO3, and 1M NH4Ac for assessing the bioavailability of rare metals. The bioavailability analysis results show that Mo and Sr were non-bioavailable, and In wa the most mobile one in TFT-LCD sludge.
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