Silicate potentiometric method

A simple potentiometric method for the determination of silica in solutions of alkali metal silicates is described. The precision of the determination of Na20 and SiQz in silicates was improved and the determination time decreased by developing a potentiometric titration method. Better determination results due to potentiometric detection of the endpoint pH are demonstrated by comparison with gravimetric determination of Na20 and Si02 in water glass containing 26-260 g/L. The potentiometric determination method can be easily automated. 

Many IC techniques are now available using single column or dual-column systems with various detection modes. Detection methods in IC are subdivided as follows [838] (i) electrochemical (conductometry, amper-ometry or potentiometry) (ii) spectroscopic (tJV/VIS, RI, AAS, AES, ICP) (iii) mass spectrometric and (iv) postcolumn reaction detection (AFS, CL). The mainstay of routine IC is still the nonspecific conductometric detector. A significant disadvantage of suppressed conductivity detection is the fact that weak to very weak acid anions (e.g. silicate, cyanide) yield poor sensitivity. IC combined with potentiometric detection techniques using ISEs allows quantification of selected analytes even in complex matrices. The main drawback... 

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