AMMONIUM SULFATE CAS N°: 7783-20-2

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
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