Eine kinetische differenzmethode unter verwendung katalysierter reaktionen

Kinetic aspects of analytical chemistry

“…Several organic compounds, cysteine, hydrazine, and alcohols were assayed by catalytic reactions. Cysteine catalyzes the reduction of silver(I) by iron(II), as reported by Babko et al ( 66) and also catalyzes the iodine-azide reaction, as described by Weisz and Ludwig (19). Suteu et al (67) reported that the oxidation of amidol with BrOe-, catalyzed by hydrazine, can be used for the determination of 0.05 mg to 0.5 mg of hydrazine.…”

“…Pelczar (18) used this reaction for the determination of copper in medicinal tinctures. Weisz and Ludwig (19) determined copper spectrophotometrically in the range of 1 to 25 µg per 10 ml by its accelerating action on the reaction of iron(III) with thiosulfate. Copper(II), in the range of 1 to 100 iig/ml, was assayed by Pall et al (80) who used the reaction between peroxidisulfate and iodide.…”

“…Fluoride inhibits the zirconium-catalyzed reaction between perborate and iodide. Klockow et al ( 56) employed an automatic potentiostatic technique for determining 19 to 190 ng of fluoride in 50 ml with a standard deviation of ±7.4 ng. Knapp (57) reported a kinetic method for fluoride based on its catalytic effect on the zirconiumxylenol orange reaction.…”

Comparison of reaction-rate methods of analysis for systems following first-order kinetics

“…are considered. Some of the more specialized methods, such as the kinetic difference (24,25) and signal-stat (26,27) methods, are not included in this comparison. The regression-kinetic method of Mieling and Pardue (18) is also excluded, since its level of sophistication is beyond the scope of this treatment.…”