添加錳氧化菌對蛇紋岩土壤中三價鉻氧化能力之探討

Effects of microbially mediated Mn(II) oxidation on chromium(III) oxidation potential in serpentinitic soils

簡嘉瑩(Chia-Ying Chien)

指導教授 ： 邱瑞宇 ； 許正一

國立屏東科技大學/工學院/環境工程與科學系所/碩士(2012年)

https://doi.org/10.6346/NPUST.2012.00230

摘要

蛇紋岩為超基性岩類之一，因具有高濃度之重金屬含量；經風化後的蛇紋岩土壤中其鉻濃度超過土壤污染管制標準。錳氧化物為土壤中之天然氧化劑，與鉻進行氧化作用，產生毒性較強且移動性高之六價鉻(Cr(VI))。本論文探討取自台灣東部之蛇紋岩土壤分別添加氧化劑(MnO2)及錳氧化菌(Pseudomonas putida strain MnB1)，觀察其水溶性錳(MnW)、易還原性錳(MnR)、可交換性六價鉻(Cr(VI)E)濃度及其菌相變化。
在35組供試土樣添加二氧化錳，其水溶性錳(MnW)及易還原性錳(MnR)濃度有大幅增加之趨勢，顯示添加二氧化錳確實能夠提供其氧化之機會；而無毛山1 0-10 cm土樣添加MnO2時，其可交換性六價鉻(Cr(VI)E)濃度由13 mg/kg增加至17 mg/kg，而隨後濃度開始下降，其餘34組土樣在添加MnO2後Cr(VI)E濃度在42天培養期間並無明顯之變化；而添加錳氧化菌於6組土樣中，其水溶性錳(MnW)、易還原性錳(MnR)及六價鉻Cr(VI)E濃度皆大幅減少，MnB1之添加量與Cr(VI)E¬濃度呈負相關，可能是吸附作用，造成六價鉻濃度明顯低於背景值。

關鍵字

蛇紋岩土壤 ； 二氧化錳 ； 六價鉻 ； 錳氧化菌 ； 假單孢桿菌

並列摘要

Serpentinites are one of ultramafic rocks, which has high heavy metals concentration. Cr from serpentinitic rocks is easily released into environment which levels are generally over the Soil Pollution Control Standards of Taiwan. Manganese oxides can promote the oxidation of Cr(III) in soil, and produce high toxicity Cr(VI). In this study, several serpentinitic soils from the east of Taiwan was added MnO2 or Pseudomonas putida strain MnB1 to verify Cr(III) oxidation potential.
It shows Cr(VI)E of WM1 surface 0-10 cm soil increased from 13 mg/kg to 17 mg/kg after adding with MnO2. It can provide oxidation environment as water soluble Mn (MnW) and easily reducible Mn (MnR) was increased after adding MnO2 into soil. However, Cr(VI)E, MnW and MnR concentration are decreased to less than the background after adding Pseudomonas putida strain MnB1. The more Pseudomonas putida strain MnB1 cell the less Cr(VI)E, it shows absorption phenomena between Pseudomonas putida strain MnB1 cell and Cr(VI)E.

並列關鍵字

Serpentinitic soil ； MnO2 ； Cr(VI) ； Mn oxidizing microorganism ； Pseudomonas putida strain MnB1

參考文獻

范心彤，2010，花蓮萬榮地區蛇紋岩水田土壤之理化特性與重金屬含量，碩士論文，國立屏東科技大學，環境工程與科學系研究所，屏東。

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