Eine thermometrisch-kinetische methode zur bestimmung von kupfer und cyanid mit hilfe der kupfer-katalysierten zersetzung von wasserstoffperoxid

Hydrogen Peroxide Decomposition in Ammonia Solutions

“…Also visualized in Fig. 2 is that a best-fit first order reaction does not fit through the data points, while a summation of first and second order does [5] Polynomial fits were performed on the hydrogen peroxide decomposition reactions of APM at various temperatures and copper or iron concentrations. In Fig.…”

“…3 Using cleaner chemicals, Schmidt et al found different values and concluded that the decomposition of hydrogen peroxide is catalyzed by very small amounts of metal ions. [4][5][6] In ultraclean chemicals with metal-ion contents lower then 0.08 ppb, an activation energy for the first order decomposition reaction of 103 kJ/mol was found. 7 By increasing the iron-ion concentration in an APM solution (70ЊC) from <0.08 ppb to 1 ppb, the half-life of the hydrogen peroxide decreases from 6.8 days to 1.7 h. 8 Closer inspection of the hydrogen peroxide decomposition data in alkaline solutions reveals that not all data fit according to a first order reaction rate mechanism.…”

Kinetic aspects of analytical chemistry

“…Nanogram amounts of copper in zinc salts were determined based on the inhibition of the iodine-azide reaction by the copper-thioammeline complex (16). Weisz et al (17) reported that the onset of the copper(II) catalyzed decomposition of hydrogen peroxide is delayed in the presence of cyanide. Both copper and cyanide were determined at the µg level.…”