AMMONIUM SULFATE CAS NÂ°: 7783-20-2

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OECD SIDS AMMONIUM SULFATE 3. ENVIRONMENTAL FATE AND PATHWAYS ID: 7783-20-2 DATE: 18.04.2006 2003). Reliability: (2) valid with restrictions 18-APR-2006 (33) (34) (11) (12) (35) Type of measurement: other Medium: food Remark: Small amounts of ammonium sulfate are used in food/food stuff additives. Average amounts used were reported as 0.033% in baked goods, and as 0.075% in gelatins, puddings, and custard. Reliability: (4) not assignable secondary citation 21-APR-2003 (36) 3.2.2 Field Studies Type of measurement: other: Leaching from soil- laboratory or greenhouse experiments Media: Leachate from lysimeter Method: Remark: Result: 68 Artificial soil profiles were constructed in PVC cylinders (155 mm inner diameter), with bottom plates and 15 µm pore size suction filters connected to an Erlenmeyer flask for leachate removal. The parent soil was a glacial till with sand and fine sand dominating, which had received 110 kg N ha-1 yr--1 ammonium nitrate as fertiliser for 20 years. The profiles consisted of 50 mm O (O: humus; 43%C, 1.3%N, pH H2O 4.1) and 100 mm E (2.9% C, 0.10%N, pH H2O 4.4) horizons (A columns), or 50 mm O (43% C, 1.3%N, pH H2O 4.1), 100 mm E (2.9% C, 0.10%N, pH H2O 4.4) and 100 mm B (2.5% C, 0.10%N, pH H2O 4.9) horizons (B columns). 4 replicates were run for each experimental situation, which comprised bare and vegetated soil (grass, and ammonium sulfate at 0.0025 (control), 0.25,and 0.5 mM/l and 2 profile depths. Irrigation was performed manually at irregular intervals, generally about once a week, as intense rain showers of 5.3 mm. Just before sampling the irrigation rate was increased to 5.3 mm per day, to make leachate collection possible. These laboratory or greenhouse experiments with repacked soil all demonstrate that soil texture, clay content, and pH are important in controlling NH4+ leaching, with more leaching occurring with sandy soils at a low pH. The ionic strength of the irrigation water may also be important, as may be the level of application of ammonium sulfate. More leaching is observed from bare soil than in the presence of crops. In the absence of vegetation up to 80 % of applied NH4+ was recovered in the leachate in the A columns (O and E horizons only) for the higher level (0.5mM) ammonium sulfate solution. In the presence of vegetation, up to 50% of applied NH4+ was recovered in the leachate. At the lower level (0.25 mmM) of application very little NH4+ was recovered in the leachate, in both the presence and the absence of vegetation. The B columns, which contained soil from the B horizon as well as from the O and E horizons, showed reduced NH4+ in the leachate, with only about 30% of NH4+ being found in leachate for the 0.5 mM application in UNEP PUBLICATIONS
OECD SIDS AMMONIUM SULFATE 3. ENVIRONMENTAL FATE AND PATHWAYS ID: 7783-20-2 DATE: 18.04.2006 both bare and vegetated soil. Negligible NH4+ was detected in the leachate from the 0.25 mM application. Test substance: ammonium sulfate (NH4)2SO4, not specified further. Reliability: (1) valid without restriction study well documented and assignable 04-JUN-2004 (37) Type of measurement: other: Leaching from soil- laboratory or greenhouse experiments Media: Leachate from lysimeter Method: soil (a sandy over loamy, mixed, mesic Ustic Haplocalcid) was collected from the top 30 cm of an uncultivated site typical of agricultural areas near Green River, UT. The soil was air dried, sieved to
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OECD SIDS AMMONIUM SULFATE FOREWORD
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OECD SIDS AMMONIUM SULFATE 10. Comm
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OECD SIDS AMMONIUM SULFATE Similarl
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OECD SIDS AMMONIUM SULFATE Consumer
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OECD SIDS AMMONIUM SULFATE 1.3 Phys
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OECD SIDS AMMONIUM SULFATE - in the
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OECD SIDS AMMONIUM SULFATE The inte
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OECD SIDS AMMONIUM SULFATE 228 µg/
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OECD SIDS AMMONIUM SULFATE 6. REFER
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AMMONIUM SULFATE CAS NÂ°: 7783-20-2

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