AMMONIUM SULFATE CAS N°: 7783-20-2

OECD SIDS
AMMONIUM SULFATE
3. ENVIRONMENTAL FATE AND PATHWAYS ID: 7783-20-2
DATE: 18.04.2006
matter), and 46-66 cm for Bh (94.2 % sand, 2.5% silt, 3.3%
clay, pH 4.6, 29.8% organic matter). Bahiagrass sod was
planted on each column, and fertilizers were applied 2 weeks
later. Distilled water was applied to each soil column prior
to fertilization, and the colunms were allowed to drain to
field capacity. Ammonium sulfate was applied to three
replicates of soil columns at 0, 84, and 168 kg N ha-1
(randomised block design). In addition, all columns
received 45 kg P ha-1 as triple phosphate, and 90 kg K ha-1
as KCl. 29.2 mm Irrigation water (content not specified -
may be distilled water?) was applied every 4th day for 3
months. The effluent was collected from the bottom of each
column for 24 hours after each irrigation treatment. A
subsample of the leachate was frozen, and later analysed for
NH4+ N.
Remark:
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.
Result:
For all fertiliser treatments the amount of NH4+ N leached
was less than 1%.
Test substance: ammonium sulfate (NH4)2SO4, not specified further.
Reliability: (2) valid with restrictions
no data on the composition of the irrigation water.
18-MAY-2004 (39)
Type of measurement: other
Media:
stream water
Method:
The study was conducted to determine the response of stream
water DOC and organic acidity to increased inputs of
ammonium sulfate to a whole catchment. Precipitation,
throughfall, and soil solution (from Spodosols) and stream
waters were characterized for DOC concentrations and
fractions (hydrophobic acids and neutrals, hydrophilic
acids, bases, and neutrals) in both a control ("East Bear"
Brook) and the treatment ("West Bear" Brook) catchments of
Bear Brook Watershed, Maine / USA, a northern hardwood
forest.
Result:
There were no clear, detectable changes in stream water
dissolved organic carbon (DOC), with only minor changes in
organic anions, as a result of bimonthly treatment with
ammonium sulfate at a dose of 900 mol/ha/year since November
1989. The treatment has resulted in an increase in N inputs
from ambient values of 600 mol/ha/year to 2400 mol N/ha/year
and an increase in ambient S input of 450 mol/ha/year to
1350 mol/ha/year.
Reliability: (1) valid without restriction
study well documented and assignable
28-MAY-2004 (40)
Type of measurement: other: leaching from soil
Media:
stream water
Method:
70
A helicopter was used to apply bimonthly applications of
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