Thiocyanate in smokers interferes with the Nova magnesium ion-selective electrode

Thiocyanate in smokers interferes with the Nova magnesium ion-selective electrode.

Thiocyanate found in serum ordinarily is the metabolite of cyanide that is inhaled with tobacco smoke and ingested with cyanogenic foods. We investigated the effect of the thiocyanate ion (SCN-) on the ionized magnesium (iMg) and ionized calcium (iCa) results determined with the AVL and Nova magnesium and calcium ion-selective electrodes (ISEs). We analyzed saline and pooled serum with added SC...

Naproxen Interference with the Ion-Selective Electrode

electrochemical: Yellow Springs Instrument Co., Yellow Springs, OH 45387) for assaying galactose. For both fluorometric procedures, all reagents and standards were prepared as previously described (1). The manual assay requires 400 jiL of Tris buffer (10 mmolJL); 600 ,iiL of a solution containing p-hydroxyphenylacetic acid (50 mg/ L) and horseradish peroxidase (EC 1.11.1.7) (10 mgIL); 160 1zL o...

Continuous monitoring using thiocyanate ion-selective electrodes

Linearity and stability of the AVL and Nova magnesium and calcium ion-selective electrodes.

We studied the stability and linearity of the AVL and Nova Mg and Ca ion-selective electrodes and the relation between the ionized Ca and ionized Mg results reported by each analyzer. The response of the electrodes to different concentrations of Mg and Ca was determined for saline solutions, aqueous solutions, and serum samples. The electrodes from both manufacturers demonstrated acceptable sta...

An evaluation of the NOVA I ion selective electrode analyser for sodium and potassium determination

Introduction In the NOVA sodium and potassium analyser*, ion-selective electrodes measure sodium and potassium by direct potentiometry in separated plasma or serum or in the plasma phase of whole blood and in urine after dilution. Sodium is measured using a glass electrode and potassium using a valinomycin electrode. The sodium, potassium and reference electrodes all have a straight tube design...