TOXICITY OF CATIONIC POLYMER FLOCCULANTS TO HIGHER PLANTS : II. Hydroponic Cultures

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概要

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• Effects of Cu and cationic polymer flocculants on hydroponically cultured plants were studied. In the presence of 1 μM Cu, more than 25 mg/liter of a cationic flocculant with an anion exchange capacity (AEC) of 3.99 me/liter caused growth reduction and chlorosis in turnip (Brassica rapa L.) Root browning also occurred at the flocculant concentration of more than 12.5 mg/liter. The plants treated with the flocculant contained higher levels of Cu in the fibrous roots and lower levels of Fe in the leaves as compared to the contents of control plants. When the medium Cu concentration was increased to 10 μM, 40 mg/liter of the flocculant caused severe toxic symptoms in turnip. Copper and the flocculant additively affected Cu content of fibrous roots. Even at a low concentration of Cu (0.1 μM), the growth of turnip, sesame (Sesamum indicum L.), cucumber (Cucumis sativus L.), and wheat (Triticum aestivum L.) was inhibited by the flocculant with this order of sensitivity. Results of dialysis of CuCl_2 solution in the presence of several flocculants and ethylenediaminetetraacetic acid (EDTA) showed that only the cationic type could hold or accumulate chelated Cu. These results suggest that: 1) chlorosis caused by cationic polymer flocculants is related to their Cu holding capacity and 2) the growth reduction is firstly caused by the adhesion of the polymers to the roots and secondly by the toxicity of Cu which accumulates in the roots.

• 一般社団法人日本土壌肥料学会の論文

著者

• Kuboi Toru

  The National Institute For Environmental Studies

• Fujii Kunihiro

  The National Institute For Environmental Studies

関連論文

• A NEW METHOD FOR SEEDLING ASSAY OF PHYTOTOXIC SUBSTANCES: LIQUID SHAKING CULTURE
• TOXICITY OF CATIONIC POLYMER FLOCCULANTS TO HIGHER PLANTS : I. Seedling Assay
• TOXICITY OF CATIONIC POLYMER FLOCCULANTS TO HIGHER PLANTS : II. Hydroponic Cultures

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