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EC number: 238-694-4
CAS number: 14644-61-2
The water solubility of zirconium sulfate was determined in a GLP study following the test design of the flask method as specified in test guideline EC A.6 and OECD Guideline 105 (Fox, 2013). Expressed as anhydrous zirconium sulfate, the water solubility was determined to be 669 g/L at 20°C and a pH range of 1.1 to 1.2.
Based on the results of the study performed by Fox (2013), the substance
is concluded to be very soluble in water at a low pH. The buffer
capacity of buffer solutions tested at pH 4, 7 and 9 was overruled,
resulting in pH values in the range of 0.2 to 0.4 and initial pH did not
influence water solubility. However, it is expected - as demonstrated
for other water soluble zirconium compounds such as zirconium acetate
and zirconium dichloride oxide - that progressive precipitation will
occur with increasing pH in realistic buffered systems.
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