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Toxicity to aquatic algae and cyanobacteria

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Description of key information

not toxic to algae in the range of solubility

Key value for chemical safety assessment

Additional information

Two studies on the toxicity to aquatic algae according to OECD 201 are available.

 

In the key study (Dr. U. Noack, 2013), a culture of Desmodesmus subspicatus was exposed to O,O,O- triphenyl thiophosphate for 72 hours at saturation concentration (undiluted filtrate of the test item with a nominal loading rate of 100mg/L) under static conditions. Due to its low solubility in water, the test item was tested by preparing Water-Accommodated-Fractions (WAFs).The ErC50 (growth rate) and EyC50 (yield) values were above saturation concentration (undiluted filtrate of the test item with a nominal loading rate of 100mg/L). There was no significant growth inhibition in the test item concentration. ErC10 (growth rate) and EyC10 (yield) is determined to be equal or higher than the saturated solution of the substance.

 

In a supporting study conducted with O,O,O-triphenylphosphorotioate in a lower purity (purity > 25%) (RCC, 1997), the ErC50 and EbC50 after 72 hours of exposure was determined as above the saturation concentration ((WAF) undiluted filtrate of the test item with a nominal loading rate of 100mg/L). The NOErC and NOEbC was determined to be equal or above saturation concentration ((WAF) undiluted filtrate of the test item with a nominal loading rate of 100mg/L). Based on these results, it can be expected that the poorly soluble constituents of the test item do not exhibit adverse effects to algae as well..

 

It can be concluded that O,O,O- triphenyl thiophosphate is not toxic to algae in the range of solubility.