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標題: | 臺灣農田土壤中新興污染元素的分佈與其有效性評估 Assessment of distribution and availability of emerging contamination elements in Taiwanese rural soils |
作者: | Yu-Hsi Liu 劉祐熙 |
指導教授: | 許正一(Zeng-Yei Hseu) |
關鍵字: | 新興污染元素,鎵,銦,鉈,土壤母質,序列萃取,單一萃取, Emerging contaminant elements,gallium,indium,thallium,parent materials,sequential extraction,single extraction, |
出版年 : | 2020 |
學位: | 碩士 |
摘要: | 當今半導體產業的製品充斥於日常生活中,卻缺乏針對其原料中的鎵、銦與鉈等新興污染元素於土壤中系統性之研究與相關地質化學知識。此外,鎵、銦與鉈於不同母質所化育形成的土壤中之濃度變異極大,因此對於環境以及人體的健康風險難以評估。本研究藉由調查37個來自6種不同母質(第四紀沖積物、砂頁岩、黏板岩、安山岩、玄武岩與蛇紋岩)之土壤剖面,進行金屬全量分析、單一試劑萃取以及序列萃取,以探討鎵、銦與鉈於各類型土壤中的分佈、潛在移動性、地質化學分化以及與土壤性質的關係。結果顯示,由ICP-MS所測定以王水所消化之鎵、銦與鉈在所有樣本的全量濃度範圍分別為2.22 – 24.5 mg kg-1、2.63 – 678 μg kg-1、3.17 μg kg-1 – 1.00 mg kg-1,平均值分別為12.2 mg kg-1、20.6 μg kg-1、103 μg kg-1,其中鎵、銦與鉈在第四紀沖積物母質之農田土壤中濃度高於其他樣本。此外,地質累積指數 (geoaccumulation index, Igeo)與富集因子 (enrichment factor, EF)顯示,樣本中所含有的鎵、銦與鉈受到人為污染的可能性低。利用1N KCl、0.1N HCl以及0.05M EDTA的單一萃取結果顯示,鎵、銦與鉈潛在生物有效性的含量低,但在第四紀沖積物母質樣本中,鎵、銦與鉈的萃取量高於其他母質樣本,BCR序列萃取的結果也指出不同母質樣本中,大部份的鎵被固定於礦物晶格中,因此具有潛在移動性的比例偏低。EDTA可萃取之鎵與鉈,可由土壤鎵與鉈全量濃度、pH值以及黏粒含量之多變因迴歸式計算而出。 Nowadays, the products of semi-conductor are full of our daily life. However, few studies and geochemical knowledge focus on emerging contaminant elements such as gallium, indium and thallium which are ones of raw marerials of these products. Besides, the concentrations of Ga, In and Tl in soils derived from different parent materials vary greatly, so the potential risk to the environment and human health is difficult to assess. This study investigated 37 soil profiles from six different parent materials including the Quaternary sediemnt, sandstone and shale, slate, andesite, basalt and serpentine, to explore the distribution, fractionation, potential mobility and bioavalibility of these metals. The total Ga, In and Tl contents meseaured by ICP-MS followed with the auqa regia digestion ranged in 2.22 – 24.5 mg kg-1, 2.63 – 678 μg kg-1 and 3.17 μg kg-1 – 1.00 mg kg-1 with the average of 12.2 mg kg-1, 20.6 μg kg-1, 103 μg kg-1, respectively. Furthermore, the total Ga, In and Tl contents are higher in the soils from the Quaternary sediments related to those from the other soil types. The geo-accumulation index (Igeo) and enrichment factor (EF) indicated that Ga, In and Tl in all cases were low in contamination levels. Low potential bioavalibility of these metals was found according to th eingle extractions of Ga, In, and Tl by using KCl, HCl and EDTA, however, the samples from the Quaternary sediment contained higher extractable levels. Additionally, the Commission of the European Communities Bureau of Reference (BCR) selective sequential extraction method indicated Ga was primarily fixed in the mineral lattices and exhibited low potential mobility. The EDTA-extractable Ga and Tl, representing the potential bioavalibility can be estimated by using multivariate regression equations considering the soil pH, clay and total content of Ga and Tl. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/8416 |
DOI: | 10.6342/NTU202001718 |
全文授權: | 同意授權(全球公開) |
電子全文公開日期: | 2025-07-22 |
顯示於系所單位: | 農業化學系 |
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U0001-2207202009453400.pdf 此日期後於網路公開 2025-07-22 | 4.44 MB | Adobe PDF |
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