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Long-term toxicity to aquatic invertebrates

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long-term toxicity to aquatic invertebrates
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Since Carbon Black is not soluble in water, it is not possible to carry out many standard ecotoxicity tests for this substance. Its low toxicity, requiring high concentrations to be tested in order that toxicity might be detected, and the low pH of some aqueous suspensions makes the testing protocol even more difficult. Nevertheless, results with fish tests have established that a fish LC50 will be greater than 1000 mg/L for aqueous suspensions, and greater than 10,000 mg/L for water accommodated filtrates. The Daphnia results from water accommodated filtrates indicate an EC50 of 5600 mg/L (original suspension concentration), which is attributed to the pH of the solution. The algal test results, also from water accommodated filtrates, show no adverse effect at the highest concentration tested, an original suspension concentration of 10,000 mg/L. 

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