A comparison of the calcium reagents, calcion and calcichrome

Abstract

Spectrophotometric, chromatographic, polarographic and microanalytical evidence is presented for the identity of the calcium reagents, calcion and calcichrome. The polarographic data favour a bis-azo structure for the compound.

Polymer-modified microelectrodes for metal ion determination and the development of a calcium amperometric probe based on surface-immobilized Antipyrylazo III

“…Having established the feasibility of employing modified microelectrodes for analytical determinations, we proceeded to identify materials that could be employed in the determination of calcium with high sensitivity and selectivity, especially towards Mg2+ since it is present in intracellular fluids at concentrations that are about 100-fold larger than those of Ca2+. There is a vast literature of reagents that have been employed for the determination of calcium (33)(34)(35)(39)(40)(41)(42)(43). Of these, we focused on the use of antipyrylazo III (43) (see structure in Figure 3) for a variety of reasons.…”

Inroganic analysis

“…Although the use of the ring oven provided a simple, effective means for analytical separation and concentration of the trace materials, the compleximetric finish in each case seems unnecessarily complicated. Ghose and Dey (43) used the ring oven in combination with chromatography for the separation and determination of various metals, and Frei and Stockton (86) have combined the use of the ring oven and circular chromatography for trace metal analysis. Trace metal analysis has also been accomplished combining thin-layer chromatography and ring colorimetry (57).…”