Co-Phytotoxicity of Ethylenediaminetetraacetic Acid and Synthetic Surfactants on Spirodela polyrrhiza and Lemna perpusilla

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Khanitta Somtrakoon


Using of ethylenediaminetetraacetic acid (EDTA) and synthetic surfactant increase the contamination of both chemical in water. The co-phytotoxicity of 0 – 20 mg/l EDTA and 3 synthetic surfactants; that are 0-10 x CMC of Triton X-100 and Tween 80 and 0-2 x CMC of sodiumdodecylsulfate (SDS) on growth of Spirodela polyrrhiza and Lemma perpusilla were studied for 3 days. The results showed that surfactant were phytotoxic on growth of both plants while EDTA was not toxic. SDS was the most toxic to plant especially on all chlorophyll content. Triton X-100 was only toxic to growth of L. perpusilla. Tween 80 was less toxic to both plants. This surfactant only decreased chlorophyll a and total chlorophyll content of S. polyrrhiza and L. perpusilla. There were not any interaction between EDTA and surfactant for most toxicity test. With these results, synthetic surfactant contamination should be more concern than co-contamination with EDTA

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