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Gravimetric determination of Sulphate

hi,
I have a Na salt of napthalene sulphonate condensate liquid. I have to detect SO4 and Na2SO4 from it by gravimetric method. If I dry this 4 gm liquid at 110 c for 90 min., I get 43% solid residue after ignition. So for SO4 analysis shall I take my snf liquid or dry solids for analysis? Why are there differences in liquid SO4 and dry snf solid SO4 result. What calculation do I have to follow for SO4 and Na2SO4 percentage determination?

Bhupesh Mulik
employee - Mumbai, India
September 21, 2011

Bhupesh Mulik
- Mumbai, India
November 11, 2011

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