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EC number: 232-245-6
CAS number: 7791-25-5
OECD SIDS on Sulfuryl chloride (2002):
Sulfuryl chloride reacts with water completely, forming sulfuric and
hydrochloric acid, thus sulfuryl chloride itself indicates no hazard for
the aquatic environment.
The hydrolysis products sulfuric and hydrochloric acid have been tested
with aquatic species. Sulfuric and hydrochloric acid cause a pH
displacement in water. It was the resulting pH that determined the
impact on aquatic life as shown with buffered test substance solution.
Thus toxic effects are not due to substance inherent properties but a
function of the pH [OECD-SIDS on Sulfuric Acid (2001) and Hydrochloric
Acid, (2002)]. Regarding natural systems, the impact of dissociated
acids depends on the buffer capacity of the system. Buffer function is
attributed to humic substances, alkaline earth carbonates, clay
minerals, silicates, as well as sesquioxides.
Theoretical pH-values of sulfuric acid or hydrochloric acid in neutral
water (pH = 7) with no buffer (e.g. dechlorinated tap water):
Natural waters, as well as reconstituted waters for testing purposes,
stipulated within the OECD test guidelines, are normally composed of
substances serving as buffers. However natural waters in boreal areas
with subsurfaces consisting of granite or gneiss have low buffer
capacities and are therefore susceptible to acidification.
The tolerance of water organisms towards pH margin and variation is
Recommended pH-values at OECD guidelines for testing issues are:
fish: 6.0 to 8.5 is preferable
daphnia: within the range of 6 to 9
algae: appr. 8
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