CharOphytes as a hyperaccumulator of lleaVy metals: role of calcirlCation and applicability in restoration of polluted water bodies
スポンサーリンク
概要
- 論文の詳細を見る
Uptake of heavy metals to produceanintemal concentration greaterthaninthe external environment appears widespread in aquatic organisms. Thus remediation of metaland heavy metal contaminated waters by aquatic plants has a prominent role in aquatic eco-systems. Here we discuss the capacity of a characean alga Nitella pseudoflabellata to accumulate heavy metals, in the context of calcite encrustation Preliminary Investigations based on varylng concentrations of Cr6+ and Ca showed a positive correlation between calcification of plants and shoot elongation. Similar trend was observed between Cr levelsand calcification of plants. Subsequentlymicrocosms were maintained for a period of 1 year for two heavy metal treatments; 012 mgL-1 cr6+and O･01 mg･Lll Cd withthe objective of assessmg the role of calcite encrustation on heavy metal accumulation, In bothcases, alkaline areas contained over 50% of total heavy metals, elucidating c?1cification to play a significant role. Speciation of sediment showed 35 % of total Cr, in the formof carbonate-bound, whereas carbonate-bound kaction of Cd was observed 43 % of total Cd. Thick marl sediment frequently observed in charophyte habitats suggests long termstorage of heavy metalsinless bioavailableforms could be possible Furthermore charophytes compare well to commonly used vascular plants in their role in remediation舟om hydroponic environments at dilute heavy metal concentrations. Thuscharophytes canbe a potential tool for naturalremediation of heavy metal contaminated water bodies.
- 2010-02-10
論文 | ランダム
- 116 粉粒体用ハンドリングセンサの開発(G.S.1-2 基礎潤滑設計)
- TRIZの基本構成とその内容
- 技術の伝承
- 技術の創造と設計
- アクチュエーション機能を備えたアクティブ力センサの開発(第2報) : 特性の解析およびコンプライアンス制御