G - Physics – 01 – N
Patent
G - Physics
01
N
150/26
G01N 31/22 (2006.01) G01N 33/03 (2006.01) G01N 33/28 (2006.01)
Patent
CA 1181333
Test Method and Article For Estimating The Concentration of Free Acid in Liquid Abstract An article 10, 30, 50 for testing liquid for free acid comprises a substantially nonreactive, neutral and nonbuffering, porous, absorbent support material having at least one portion thereof which contains a composition comprising an effective amount of acid-base indicator capable of changing color in a pH range on the order of 6-10, a predetermined amoumt of base compound reactive with free acid and being present in an amount equivalent to a known concentration of free acid, and about 30-99.5 parts by weight of non-volatile material of a substanti- ally colorless, substantially neutral, humectant organic solvent which is substantially non-volatile under ambient conditions. An organic liquid to be tested is contacted with the article and any color change in the article after the passage of sufficient time is observed.
392179
Mlinar Jerry W.
Neumayer John J.
Minnesota Mining And Manufacturing Company
Smart & Biggar
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