The determination of fluorine in deposit-gauge samples

Direct Spectrophotometric Fluoride Determination.

“…use of AC for the determination of fluoride were reported toward the conclusion of the present study (3)(4)(5)(6).…”

“…Each value is the average of two or more determinations. 6 Average of 24 determinations with a standard deviation of 0.004. c Average of 7 determinations with a standard deviation of O.OOI5.…”

Ion Exchange Chromatography

“…Nonmetals. For separating fluoride ions prior to photometric determination with alizarin complexone, two papers describe cation-exchange methods, one for phosphate rock (116), the other for water (58). This will be a welcome alternative to the cumbersome distillation.…”

Analytical chemistry

“…Johnson and Leonard 448 apply a spectrophotometric measurement to the blue complex formed by fluoride ions and the cerium(m) chelate of alizarin complexan, pointing out that the use of borosilicate glass flasks tends to give low results; the blue complex has been investigated in another context. 449 Nuclear magnetic measurement 450 provides a specific and rapid method of determining fluorine in fluorocarbon liquids, but not with the accuracy usually sought. Valach451 has critically examined a number of methods of determining fluorine.…”