Membranes Oxygen data

Children-The recommended dose in pediatric patients is for a total daily dose of 2 to 4 mg/kg, to be divided and administered every 6 to 8 hours up to a maximum of 50 mg given every 6 to 8 hours. Limited data in neonatal patients (under 1 month of age) receiving extracorporeal-membrane oxygenation (ECMO) have shown that a dose of 2 mg/kg is usually sufficient to increase gastric pH to greater than 4 for at least 15 hours. Therefore, consider doses of 2 mg/kg given every 12 to 24 hours or as a continuous infusion. 

The calibration of a potentiometric cell with the Pt(02) membrane electrode with the use of KOH, in the range of pO values from 1 to 4, results in a slope value of 0.0995 V [236]. However, a Pt(02)IZr02(Ca0) gas membrane oxygen electrode should exhibit the peroxide function in the stated pO range, and, therefore, the correctness of the data presented is very doubtful. 

All the routines described for the determination of the thermodynamic (concentration) parameters in metal oxide solutions include some indirectly obtained values. For example, the equilibrium concentration of metal cations is calculated proceeding from the quantity of the oxide-ion donor consumed for titration (precipitation). Direct determination of the concentration of metal cations in the melt (if it is possible) allows one to obtain more correctly the obtained solubility product values. Our paper [332] reports a method for correction of the solubility product values for oxides on the basis of the potentiometric titration data. The modification of the standard routine consists of the simultaneous use of two indicator electrodes, one of which is the membrane oxygen electrode and the other is a metal electrode, reversible to the cations the oxide consists of. This routine was used to estimate the solubility products of copper(I) and nickel(II) oxides in the molten KCl-NaCl equimolar mixture at 700 °C. Investigation of Cu20 by the proposed method is of considerable importance since, as will be shown further, the process of dissociation/dissolution of copper(I) oxide in molten alkali-metal halides differs from the generally accepted one which was considered, e.g. in Ref. [119]. 

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