AMMONIUM SULFATE CAS N°: 7783-20-2

OECD SIDS
AMMONIUM SULFATE
3. ENVIRONMENTAL FATE AND PATHWAYS ID: 7783-20-2
DATE: 18.04.2006
acid brown soil, silty clay loam, stand = Picea abies,
aluminium buffer range, C/N 17.0, past N input 37.1 kg/ha/a,
pHH2O 3.3.and Wekerom (NL) - Podsol soil, sand, stand = Pinus
sylvestris, aluminium buffer range, C 22.0, past N input 52.1
kg/ha/a, pHH2O 3.9.Cation exchange capacity and base
saturation information can be found in the paper.
Lysimeters were prepared from soil cores (14 cm inner
diameter and 24 cm deep) taken at each site in Plexiglas
cylinders. The bases of the cores were trimmed, and a 5 cm
deep layer of acid washed sand was placed at the bottom of
each core, which was then capped and sealed.
A ceramic cup conected to a suction apparatus was inserted
diagonally into the sand layer, and the join with the cykinder
was sealed.
The throughfall solution was removed through the ceramic cup
during the experiment. 28 lysimeters were installed at each
site, using a randomised block design. The lysimeters were
roofed to enable control of throughfall inputs. One half of
the lysimeters contained carefully inserted living tree roots.
Throughfall applications consisting of the throughfall
volumes of each individual site, collected and measured for
the period, with the addition of 75 kg ha-1-a-1 (NH4)2SO4
for the N treatments, were made to each lysimeter at 2 week
intervals. The leachates were collected every 2 weeks, for 1
year from September 1992, and analysed for volume, pH, and
major cations and anions.
Result:
Soil texture and pH were important in controlling NH4+
leaching. The two less acidic, clay/clay loam soils showed
almost total retention of NH4+. Nearly 75% of added N was
leached as NH4+ in the acid sandy soils. The presence of
living roots significantly reduced soil solution nitrate and
associated cation concentrations at two of the six sites.
The very different responses of the six soils to increased
(NH4)2SO4 deposition emphasises that the establishment of N
critical loads for forest soils needs to allow for
differences in the N storage capacity and nitrification
potential of the soils
Test substance: ammonium sulfate (NH4)2SO4, not specified further
Reliability: (2) valid with restrictions
study well documented and assignable
Flag:
Critical study for SIDS endpoint
04-JUN-2004 (46) (47)
3.3.1 Transport between Environmental Compartments
Type:
Media:
adsorption
water - sediment
Result: log Koc = 1.38 (Koc = 24)
Reliability: (2) valid with restrictions
accepted calculation method
Flag:
Critical study for SIDS endpoint
27-JAN-2004 (16)
Media:
Method:
Remark:
74
soil - air
other: measured
1) This is a static test, so less ammonia will be removed
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