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Acute toxicity of four relatively new chelating agents and their equimolar manganese and cadmium complexes was studied
Abstract
Acute toxicity of four relatively new chelating agents and their equimolar manganese and cadmium complexes was studied. The chelating agents studied were gluconic acid (GA), -alaninediacetic acid (ADA), diethylenetriaminepentakis- methylenephosphonic acid (DTPMPA), and nitrilotriacetic acid (NTA). Three common bioassays, namely Daphnia magna, Ra- phidocelis subcapitata, and Photobacterium phosphoreum (Mic- rotox™ bioassay) were applied. R. subcapitata proved the most sensitive to these compounds. With D. magna bioassay the LC50 values were 600 –900 mg/L with all other studied chelates and their Mn complexes, except Mn-GA, which yielded LC50 value of 240 mg/L. The Cd-chelate complexes proved highly more toxic compared to Mn-chelate complexes or uncomplexed chelates ex- hibiting LC50 values of 130–200 g/L. However, Cd-DTPMPA was an exception exhibiting LC50 value of 2170 g/L. That is to say,DTPMPA proved the strongest chelating agent to reduce the Cd toxicity in the present study. The results from these bioassays were well in agreement to each other as well as with the results pub- lished elsewhere.
Keywords: chelating agents diethylenetriaminepentakis- methylenephosphonic acid DTPMPA
Acute toxicity of four relatively new chelating agents and their equimolar manganese and cadmium complexes was studied