All
solutions used for this test must be prepared with distilled water R.
Add 3 ml of
a 250g/l solution of barium chloride R to 4.5ml of sulphate
standard solution (10ppm SO4)R1.
Shake and allow to stand for 1 min. To 2.5 ml of this solution, add 15ml of the solution to be
examined and 0.5ml of acetic acid R.
Prepare
a standard in the same manner using 15ml of sulphate standard
solution (10ppm SO4) R instead of the solution to be examined.
After 5min,
any opalescence in the test solution is not more intense than that in the standard.
Reagent
used
§ 250 g/l solution of barium chloride
§ Acetic Acid: Dilute 30g of glacial acetic acid to100ml with water. It contains not less than 29.0%
and not more than 31.0% w/v of C2H4O2 (5M).
§ Sulphate Standard Solution (10ppm SO4) R1: Dilute
1volume of a 0.181% w/v solution of potassium sulphate in ethanol (30%) to 100
volumes with ethanol (30%).
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