AMMONIUM SULFATE CAS N°: 7783-20-2

OECD SIDS
AMMONIUM SULFATE
3. ENVIRONMENTAL FATE AND PATHWAYS ID: 7783-20-2
DATE: 18.04.2006
Result:
Test condition:
Reliability:
Surface crop residue may also be important in some cases.
Only 1% or less of the applied ammonium sulfate was captured
as ammonia, after 16 days at 25 °C.
In a laboratory study using sieved soils hydrated to field
capacity, static ammonia traps were used to capture ammonia
volatilising from ammonium sulfate added to two soils of pH
6.8 and 5.6, with and without a straw cover.
(3) invalid
incomplete documentation
18-MAY-2004 (43)
Type of measurement: other
Media:
soil-air
Result:
40% of the total applied ammoniacal nitrogen was volatilised
after 48 hours.
Nitrification did not occur in the soil, due to the high
concentration of applied N (about 870 µg NH4-N/g soil).
Test condition: 15N-labelled ammonium sulfate was added to a pig slurry, and
labelled 15-N ammonia loss from soil to which pig slurry was
topically applied was measured in gas volatilisation chambers.
The air flow rate was 5 L/min (about 10-12 exchange volumes
per minute).
At each sample time the soil/slurry mixture was extracted.
Extract and extract residue were analyzed for total ammonical
nitrogen, NO3-N and total N-content. NH3 volatilizing from the
soil/slurry mixture was measured. Three replicates for each
treatment were conducted
Reliability: (2) valid with restrictions
basic data given
28-MAY-2004 (44)
Type of measurement: other
Media:
soil, biota, precipitation, streamwater
Method:
Result:
72
A 15N-tracer study in a fertilized, forested catchment at
the Bear Brook Watershed in Maine, USA, was conducted in
order to characterize N cycling processes, to identify sinks
for ammonium-N additions, and to determine the contribution
of the experimental ammonium additions to nitrate export
from the treated catchment.
Distributions of 15N in plant tissues, soils, precipitation
and streamwater was collected before adding tracers and
showed that nitrate-N (the dominant form of inorganic N
deposition at the site) inputs under ambient conditions were
depleted in 15N relative to plants and that soil was
enriched in 15N relative to plants. The 15N content of
streamwater nitrate was within the range of 15N contents in
natural plant tissues, suggesting that nitrate deposited
from the atmosphere is reduced and assimilated into soil and
plant N pools before being leached as nitrate from the
catchment. Variations in 15N natural abundances also
suggested that most N uptake by trees is from the forest
floor and that nitrification occurs in soils at this
catchment under ambient conditions. Changes in 15N contents
of plant tissues, soils and streamwater after adding a 15N
tracer to the ammonium sulfate fertilizer applied to the
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