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Iodine number determinations by dead‐stop titrimetry
Author(s) -
Duke J. A.,
Maselli J. A.
Publication year - 1952
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02643529
Subject(s) - iodine , titration , extrapolation , chemistry , galvanometer , iodometry , chromatography , analytical chemistry (journal) , mathematics , statistics , inorganic chemistry , physics , optics , organic chemistry , laser
Summary The amperometric (dead‐stop) method has been applied to iodine value determinations of fatty acids and oils. The values obtained agree with those arrived at by the starch end‐point method. The use of this simple instrument appears to give however more accurate results since the endpoint is determined by the extrapolation of the linear response of the galvanometer with small increments of added thiosulfate to a zero galyanometer reading which corresponds to a zero iodine concentration. The fluctuations of the galvanometer needle give visible evidence of the approach of the endpoint, thereby facilitating the titration.