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Annnnnnny way, I kinda lost track of my point.
The point was that the vinoferm kit can be used for SO2 testing purposes whilst the phenophthalene kit cannot. I'd also wager that the phenophthalene based kits are more accurate with respect to wine acid, although because the wine acid test is very complicated (titrating against 3 acids in a wine versus 1 acid in SO2) it might not be significant.
Organic acid titrations are complicated. If I get some time I'll try and do some titrations to some known volumes in the lab.
On a slightly related post, if you are buying phenophthalene, the cost of the powder is about £6 for 50g from Alfa Aesar (product code A17135) and indicator solution is about a 1% dilution of the powder in methanol, or indeed any alcohol would work.
The point was that the vinoferm kit can be used for SO2 testing purposes whilst the phenophthalene kit cannot. I'd also wager that the phenophthalene based kits are more accurate with respect to wine acid, although because the wine acid test is very complicated (titrating against 3 acids in a wine versus 1 acid in SO2) it might not be significant.
Organic acid titrations are complicated. If I get some time I'll try and do some titrations to some known volumes in the lab.
On a slightly related post, if you are buying phenophthalene, the cost of the powder is about £6 for 50g from Alfa Aesar (product code A17135) and indicator solution is about a 1% dilution of the powder in methanol, or indeed any alcohol would work.
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