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Toxicity to microorganisms

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Description of key information

NOEC (Multiday) respiration inhibition: 5000-8000 mg/L.

Key value for chemical safety assessment

EC10 or NOEC for microorganisms:
5 000 mg/L

Additional information

Sodium chloride in waste water treatment plant is well investigated as waste water treatement plant based on the sea shore may use sea water to flush the system. Sodium chloride can stimulate growth in pure cultures up to concentrations of 300 -600 mg/L. Activated sludge in simulated sewage treatment plants have a high tolerance for sodium chloride in waste water. While the available data gives wide ranges for the NOEC concentration in simulated sewage treatment plants, no data has been identified from experiments comparable to the standard activated sludge inhibition protocol. In the absence of such data, the lower end of the reported multi day expoure NOEC for BOD performance (i.e. respiration inhibition) after intermittent dosing of sodium chloride is used as key value.

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