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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

In a published study according to standard methods of the American Public Health Association a LC50 value (72 h) of 1790 mg/L was obtained with single superphosphate.
In an OECD 202 study (GLP) with Ca sulfate no immobilisation was observed and the LC50 was >100 mg/L. Also, in an OECD 202 study (GLP) with potassium humate no immobilisation of daphnia was observed (LC50 > 116 mg/L).

Key value for chemical safety assessment

Additional information

The following information on constituents of the submission substance and components of the humate-complexed superphosphate are available:

Single Superphosphate:

In a published study toxicity of single superphosphate (SSP) to Daphnia carinata was tested according to standard methods for the examination of water and wastewater, as described by the American Public Health Association (1975). Daphnia were exposed to various concentrations over 72 hours (compared to 48 h in OECD 202). High LC50 values (1790 and 1825 mg/L) were obtained at water temperatures of 20.7°C and 30.8°C, respectively.

Potassium humate:

In a study according to OECD 202 (under GLP conditions) humic acid, potassium salt was tested for acute toxicity to Daphnia magna. As no mortalities or immobilisation were observed up to the highest concentration tested the LC50 was > 116 mg/L test substance.

Ca sulfate:

In a study (limit test) according to OECD 202 (under GLP conditiosn) calcium sulfate dihydrate was tested for acute toxicity to Daphnia magna. As no mortalities or immobilisation were observed at the test concentration of 100 mg/L the LC50 was determined to be >100 mg/L.

In the publication by Mount et al. (1997) various solutions of inorganic salts were tested towards fish and the daphnid species Daphnia magna and Ceriodaphnia dubia. The study is well documented and followed US EPA guidelines. 48 h LC50 of >1970 mg/L and >1910 mg/L were obtained for Ca-sulfate with Daphnia magna and Ceriodaphnia dubia, respectively.

Taken these data together this shows that the submission substance, consisting of the humate phosphate complex and Ca sulfate does not possess aquatic toxicty to daphnia. An LC50 of > 100 mg/L can be deduced from the data.