Polymer membrane electrodes operated by pulsed chronopotentiometry have recently been introduced to replace traditional ion-selective electrodes for a number of applications. While ion-selective electrodes for the polycation protamine have been reported, for instance, a pulsed chronopotentiometric readout mode (called here pulstrode) provides improved stability and reproducibility while exhibit...

We describe positive interference with the ion-selective electrode determination of lithium (Lytening 2Z analyzer; Dade) when blood is collected in a 10-mL plain red-top plastic Vacutainer Plus Tube (Becton Dickinson) containing a silica clot activator and silicone surfactant (prod. no. 36-7820). We evaluated both the original tube (blue-labeled) and a new tube formulated to contain less silico...

A case of os teoma of the coronoid process in a 51-year-old w o m a n is presented. Surgical resection, followed by postoperat ive phys io therapy to st imulate rmrmal funct ion, is the t rea tment of choice for this lesion.

The centrally important role of acids in aqueous chemistry has stimulated the search for the smallest droplet of hydrochloric acid. Based on several independent quantum calculations, this appears to be the HCl(H2O)4 cluster, which dissociates into the so-called solvent ion pair (SIP), H3O(+)(H2O)3Cl(-). Experimental verification of this prediction via infra-red spectroscopy is a major challenge...

Hypomagnesemia is associated with alcoholism (Lim P, Jacob E. Metabolism 1972;21:1045-51). Here we assess two measurements of blood magnesium in emergency care patients with confirmed ethanol ingestion. Serum total and ionized magnesium (tMg, iMg) were measured in 88 patients with ethanol concentrations of 6-128 mmol/L and in sera of 97 hospitalized patients (control group). iMg was measured by...

Azide ion is an excellent vibrational probe for studying ion-ion and ion-dipole interactions in solutions because its frequency is sensitively dependent on its local environments. When azide ion forms contact ion pairs with cations in dimethylsulfoxide (DMSO), free azide ion and contact ion pairs are spectrally well distinguished in FTIR spectra. Here, we investigated vibrational population rel...

This paper reports on the development of a micro-potentiometric sensor based on external microelectrodes introduced into a microchip. We miniaturized reference and ion-selective electrodes (ISEs) and embedded them into a plastic (PDMS) microchip; the miniaturization of ISE was attained by using a monolithic capillary-based membrane. This sensor was applied to the detection of alkali ions (Na+, ...

Evaluation of a new generation of sodium slides and reference fluid for use with the Kodak Ektachem 400 Analyzer demonstrated improved performance in generation 04 over the previous generation 03 slide for sodium determinations. A decrease in between-replicate imprecision and a correction of the "serum" assigned values of the calibrators used to calibrate the slide used with the reference fluid...

A synthesized bis(dibenzoylmethanato)Co(II) complex (Co(DBM)(2)), has been used as a ionophore for the preparation of a new perchlorate ion-selective electrode. The electrode exhibits a Nernstian response over the perchlorate concentration range of 8.0x10(-7)-1.0x10(-1)M with a slope of 60.3+/-0.5 mV per decade of concentration. The limit of detection as determined from the intersection of the ...