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Toxicity to aquatic algae and cyanobacteria

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One reliable acute/chronic toxicity data point (Klimisch 1, GLP) for an algae species – the green alga Pseudokirchneriella subcapitata – has been identified. Based on measured dissolved barium concentrations in the water column, a 72h-ErC50 and 72h-NOEC of >1.15 and >=1.15 mg Ba/L, resp. is reported by Egeler and Kiefer (2010), using  BaCl2 dihydrated as test substance.

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One reliable acute and chronic toxicity data point (Klimisch 1, GLP) for an algal species - the freshwater green algaPseudokirchneriella subcapitata- has been identified. No effect (growth rate) was noted at the highest (nominal) test concentration of 100 mg barium dichloride dihydrate/L.

Both the dissolved and total fration was measured. Dissolved levels were well below the theoretical expected levels, and this most likely due to formation the poorly soluble barium sulfate. At the highest nominal concentration of 100 mg Ba/L, the dissolved and total Ba concentration were 1.15 and 30.1 mg/L, respectively (geometric mean measured concentration). Therefore, based on total Ba-levels in solution, the ErC50and NOEC are >30.1 and >=30.1 mg Ba/L, respectively. However, based on dissolved barium concentrations in solution, the ErC50and NOEC are >1.15 and >=1.15 mg Ba/L, respectively.