AMMONIUM SULFATE CAS N°: 7783-20-2

OECD SIDS
AMMONIUM SULFATE
4. ECOTOXICITY ID: 7783-20-2
DATE: 18.04.2006
the logarithm transformation of the concentration and the
angle transformation of the percent dead between the two
doses that bracket 50% response.
YEAR OF STUDY: not reported.
Reliability: (2) valid with restrictions
concentration not measured. Limited documentation of
results.
Flag:
Critical study for SIDS endpoint
26-JAN-2004 (59)
Type:
flow through
Species:
Gammarus fasciatus (Crustacea)
Exposure period: 96 hour(s)
Unit: mg/l Analytical monitoring: no
LC50 : > 100
Method:
GLP:
Test substance:
other: see Test Conditions
no
other TS: ammonium sulphate, reagent-grade, no further details
Remark:
In this study, 27 commercial inorganic and organic chemicals
were tested simultaneously in seven aquatic species.
Result:
A LC50 value could not be determined because the proportion
killed at the highest dose level (100 mg/L) was less than
50%. No further details reported.
Test condition: TEST ORGANISMS: Sideswimmer (Gammarus fasciatus), 0.007 g.
The test organisms were acclimated to the control diluent
water in the breeding/rearing tanks (time period not
reported). Food was withheld for the 24 hours preceding
start of the test. Juveniles as uniform in size as possible
were collected from the colonies. Ten juvenile organisms
were exposed to the test chemical in each treatment.
Biological loading was kept below 0.5 gram wet weight per
liter of test solution.
TEST VESSEL: The assay was performed in seamless glass,
30.5-cm cuboidal, Pyrex chromatographic jars to which 20
liters of test solution was added. The test organisms were
segregated in welded stainless steel, 55-mesh wirecloth
baskets (5.5 cm in diameter x 7.5 cm in depth). Each basket
was suspended from a 1-rpm motor-driven mechanism that
raised and lowered the baskets in the water column. A
stainless steel band, slotted every 0.5 cm, facilitated the
positioning of the baskets so that the submerged volumes
changed from one-third to wo-thirds during each cycle.
One-half of the volume of the sumerged basket was exchanged
with the main tank volume every minute.
TEST SOLUTION: The test chemical was added directly to the
diluent water to give a nominal concentration of 100 mg/L.
The test chemical concentrations were not analyzed. Once the
test solutions were prepared, the starting temperature,
dissolved oxygen and pH values were determined for each
exposure concentration. When the starting pH of the test
soluton fell outside the extremes of 6.5 to 8.5, the pH was
adjusted to 7.0 by the addition of 10% (v/v) NaOH or 10%
(v/v) H2SO4.
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