Gravimetric Determination of Sulphate

Sulphate can be precipitated as barium sulphate in a similar way to that described in Sec.7.3.2 but without the initial step of oxidation. 

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And the qualities we are looking for are always realized as a matter of degree, these being best reflected by a proper statement of measurement uncertainty. This can also be illustrated by a top-down example from gravimetry suppose that NIST fails to incorporate in their measurement procedure one correction after another the quality of results for the gravimetric determination of sulphate as barium sulphate (for a recent account of... 

JJ Gravimetric Determination of Sulphate in Comprehensive Analytical Chemistry. C. Willson, and D. Willson, Eds., Vol. 1C. Elsevier Publishing Company. Amsterdam, Netherlands. 1962. p. 282. 

The volume of the water sample to be employed for gravimetric determination of sulphate must be measured so that it contains between 10 and 500 mg sulphate ions. Where necessary, a larger volume of water must be reduced to 400 ml, and/or in the case of lower concentrations of sulphate ions to 100 ml. 

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