AMMONIUM SULFATE CAS N°: 7783-20-2
AMMONIUM SULFATE CAS N°: 7783-20-2
AMMONIUM SULFATE CAS N°: 7783-20-2
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OECD SIDS<br />
<strong>AMMONIUM</strong> <strong>SULFATE</strong><br />
3. ENVIRONMENTAL FATE AND PATHWAYS ID: <strong>7783</strong>-<strong>20</strong>-2<br />
DATE: 18.04.<strong>20</strong>06<br />
3.1.1 Photodegradation<br />
Remark:<br />
Ammonium sulfate is not photodegraded. It can be formed in<br />
atmospheric aerosols from the interaction of atmospheric<br />
ammonia with atmospheric SO2.<br />
22-MAY-<strong>20</strong>03 (26) (17)<br />
3.1.2 Stability in Water<br />
Type:<br />
abiotic<br />
Remark:<br />
In aqueous solution, ammonium sulfate is completely<br />
dissociated into the ammonium ion (NH4+) and the sulfate anion<br />
(SO42-). Depending on pH, ammonia (NH3) exists in equilibrium<br />
with the ammonium ion (NH4+), according to the following<br />
relationship:<br />
NH4+ + H2O NH3 + H3O+<br />
In general, as pH increases, the fraction of the total ammonia<br />
which is un-ionized increases. For example, at 5 °C and pH<br />
6.5, 0.0395% of the total ammonia is present as NH3.<br />
Increasing the pH from 6.5 to 8.5 will increase the un-ionized<br />
ammonium by a factor of approximately 100 (Rice and Bailey<br />
1980). Increasing the temperature will also increase the<br />
percentage of unionized ammonium. For example, in seawater at<br />
25 °C and pH of approximately 8.1, approximately 7% of the<br />
total ammonia is present as NH3.<br />
Reliability: (2) valid with restrictions<br />
Flag:<br />
Critical study for SIDS endpoint<br />
12-JUL-<strong>20</strong>04 (27) (28)<br />
3.1.3 Stability in Soil<br />
3.2.1 Monitoring Data (Environment)<br />
Type of measurement: background concentration<br />
Medium:<br />
air<br />
Method:<br />
Result:<br />
Fine (
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