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Toxicity to other above-ground organisms

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Information is available on the toxicity of ammonium sulfate to the amphibians Pseudacris regilla (Pacific treefrog), Ambystoma gracile (Northwestern salamander), and Rana aurora (Redlegged frog) (Nebeker and Schuytema, 2000). All tests were carried out for 10 days, in aquaria with a continuous flow of test solution.

 

Two experiments were carried out with Pseudacris regilla tadpoles from different egg masses, aged 6 and 9 weeks at the start of the test. Endpoints were growth and wet weight. The NOEC for the 6 week old tadpoles was 82 mg/l ammonium sulfate (calculated from 17.4 mg/l NH4-N). The corresponding LOEC was 154 mg/l ammonium sulfate (calculated from 37.0 mg/l NH4-N). The NOEC for the 9 week old tadpoles was 153 mg/l ammonium sulfate (calculated from 32.4 mg/l NH4-N). The corresponding LOEC was 247 mg/l ammonium sulfate (calculated from 52.5 mg/l NH4-N). The LC50 (10 d) for both 6 and 9 weeks old Pseudacris regilla tadpols was > 995 mg/l (calculated from 211.2 mg/l NH4-N).

 

Larvae of the Northwestern salamander (Ambystoma gracile) were 5 weeks old at the beginning of the test. The NOEC for the endpoint wet weight was 384 mg/l ammonium sulfate (calculated from 81.5 mg/l NH4-N). The corresponding LOEC was 596 mg/l ammonium sulfate (calculated from 126.5 mg/l NH4-N). The LC50 (10 d) for Ambystoma gracile was > 995 mg/l (calculated from 211.2 mg/l NH4-N).

 

Tadpoles of the Redlegged frog (Rana aurora) were 4 weeks old at the beginning of the test. The NOEC for for both endpoints growth and wet weight was 390 mg/l ammonium sulfate (calculated from 82.7 mg/l NH4-N). The corresponding LOEC was 631 mg/l ammonium sulfate (calculated from 134.0 mg/l NH4-N). The LC50 (10 d) for Rana aurora was > 995 mg/l (calculated from 211.2 mg/l NH4-N).