Maintaining the Exponential Growth Rate of Algae in a 96-Hour Exposure

SETAC Europe 2020 -- Algae are internationally established test organisms in chemical risk assessment. Toxicity test guidelines incorporating algae are largely focused on traditional apical endpoints such as growth rates following a 72-hr chemical exposure as per OECD 201 guidelines. However, depending on the country of registration, the OCSPP 850.4500 might be required, which looks at endpoints over 96 hrs.