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EC number: 700-990-0 | CAS number: -
Toxicity to soil microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
SOIL MICROORGANISMS - NITROGEN TRANSFORMATION TEST
Key value for chemical safety assessment
- Short-term EC50 for soil microorganisms:
- 2 987 mg/kg soil dw
Additional information
Test systems were dosed with Phosflex 71B (tBuTPP) at nominal concentrations of 0, 30, 100, 300, 1000, and 2987 mg/kg dry soil, and incubated at approximately 20º C for 28 days. Soil samples were collected on days 0, and 28; and analyzed to determine nitrate concentrations.
The percent inhibition of nitrate formation, compared to untreated controls, was
calculated for each treatment level. Results are presented in the following table:
Application Rate |
Days 0-28 |
|
Rate |
Inhibition |
|
0 mg/kg |
4.45 |
-- |
30 mg/kg |
4.68 |
-5.1% |
100 mg/kg |
5.25 |
-18.0% |
300 mg/kg |
4.76 |
-6.9% |
1000 mg/kg |
5.15 |
-15.7% |
2987 mg/kg |
4.43 |
0.6% |
The EC50 value for inhibition of nitrate formation after 28 days was greater than 2987 mg Phosflex 71B
(tBuTPP)/kg dry soil, the highest concentration tested. Phosflex 71B (tBuTPP) did not have an adverse effect
on nitrogen transformation in aerobic surface soil.
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