The T-value in the score for hazard refers to chronic toxicity. Underlying data for P, B, T and risk are from Fass.
Fass environmental information for Aspirin (acetylsalicylic acid) (downloaded 2018-09-24).
Persistence according to OECD 301F: "The substance was introduced into the test system at a concentration of 200 mg/L as theoretical oxygen demand (ThOD) and was found to be degraded to 69.6% after 10 and 83.3 % after 28 days. Hence, acetylsalicylic acid can be regarded as readily biodegradable."
Bioaccumulation: "The log Kow/20 °C was - 0.32, - 1.62, and - 1.61 at pH 5, 7 and 9, respectively."
Chronic toxicity: There is NOEC for XX trophic levels, lowest NOEC for fish 283 microg/L.
PEC/PNEC is based on sales data in Sweden in year 2016. PEC/PNEC = 0,69 which gives the risk low.
Acetylsalicylic acid and penicillins were eliminated despite their very high consumption and discharge to sewage because they break down very quickly, both in the treatment of wastewater and in natural waters.
Author: The Pharmaceutical unit of Region Stockholm