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EC number: 212-634-7 | CAS number: 834-12-8
Toxicity to soil microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
The exposure of soil to 28 kg ametryn/ha for 28 days did not show significant effects on soil nitrification, and neither 28 kg/ha for 28 days nor 20 kg ametryn/ha for 42 days showed significant adverse effects on soil respiration.
Soil microorganisms: NOEC (28-day) = 28 kg/ha
Soil microorganisms: NOEC (42-day) = 20 kg/ha
Key value for chemical safety assessment
Additional information
A study was performed to assess the toxicity of ametryn to soil microorganisms (Perina, 2000). The study was conducted according to OECD Guidelines 216 and 217 with no deviations. The soil moisture ranged from 40 to 60% of the water holding capacity, and the organic carbon content (% dry weight) was 31 g/dm3 and 20 g/dm3 for soil LR and LE (Rhodic Hapludox) , respectively. In the control soil LR (Rhodic Hapludox - American taxonomy) on day 0, the nitrogen content (% dry weight) was 20.29 mg N/kg dry soil as ammonium, 0.48 mg N/kg dry soil as nitrite, and 9.04 mg N/kg dry soil as nitrate. In the control soil LE (Typic Hapludox - American taxonomy) on day 0, the nitrogen content (% dry weight) was 18.20 mg N/kg dry soil as ammonium, 0.40 mg N/kg dry soil as nitrite, and 6.34 mg N/kg dry soil as nitrate. The 28-day NOEC results, based on nitrate formation rate and respiration rate, are reported to be 28 kg/ha. According to the results, the tested concentrations of 2.8 and 28.0 kg of AMETRYNE SIPCAM/ha did not show significant adverse effects on the soil microflora (carbon and nitrogen cycles) using the LE and LR soils.
Lemnitzer (1997) evaluated the effects of ametryn on soil microflora, in two soils. The study was conducted according to GLP, and followed the guidelines set forth in BBA Part VI, 1-1 and OECD guideline 216 with no deviations. Soil moisture content was 40% water holding capacity, and the organic carbon content for the two soils was 0.92% and 1.75%, respectively, while the nitrogen content was 0.05% and 0.17%, respectively. The 42-day NOEC was reported to be 20 kg/ha, based on respiration rate.
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