Computer-controlled evaluation in thin-layer chromatography

Ligand interference preventive buffer in determination of copper(II) by a cupric ion selective electrode

“…Electrical noise, present on all signals, can often obscure a digitized waveform of interest because of the potentially high frequency response of sampling circuitry. This situation is aggravated by the likelihood that high-frequency noise will be "aliased" (2) down into the signal frequency region.…”

“…The terms "apparent" and "equivalent" can be extended to other measures of efficiency or performance (e.g., the separation number (13)) in order to clearly distinguish Ligand Interference Preventive Buffer in Determination of Copper(ll) by a Cupric Ion Selective Electrode Sir: In the determination of copper(II) by means of a cupric ion selective electrode, the problems encountered are variation of activities caused by complexation of copper(II) with ligands in samples and the abnormal response of the electrode in the presence of some ligands such as NTA and EDTA (1). In addition, interferences of halide ions limit its application or practical analysis (2,3).…”

Consistent terminology for efficiency in high performance thin-layer chromatography

“…Ligand Interference Preventive Buffer in Determination of Copper(ll) by a Cupric Ion Selective Electrode Sir: In the determination of copper(II) by means of a cupric ion selective electrode, the problems encountered are variation of activities caused by complexation of copper(II) with ligands in samples and the abnormal response of the electrode in the presence of some ligands such as NTA and EDTA (1). In addition, interferences of halide ions limit its application or practical analysis (2,3).…”

“…The term "high performance thin-layer chromatography" (HPTLC) has begun to appear in the chromatographic literature within the past year (1)(2)(3)(4). Its use in various contexts has given rise to some confusion concerning the definition of "high performance".…”

Pharmaceuticals and Drugs

“…This nonlinearity is valid for both peak height and peak area measurements. A detailed interpretation of the problems is presented in the papers of Ebel and coworkers (149)(150)(151)(152)(153)(154)(155)(156).…”