Properties and analytical applications of the heteropolymolybdates of phosphorus, arsenic, silicon and germanium—IV1Determination of phosphomolybdic and silicomolybdic acids via the molybdenum content, with phenylfluorone

Simultaneous reaction-rate determinations of phosphate and silicate

“…Reduction methods to heteropoly blues suffer problems of longer reaction time, deviations from Beer's law, unstable reagents and products, and high blank absorbances. Alternatively, another procedure measures the 12-MPA formed and then the combined 1ZMPA and 12-MSA concentrations in a less acidic solution (24). However, since the 12-MSA, 12-MPA, and other heteropolymolybdate concentrations vary with acidity, this procedure can also be prone to error.…”

A Sensitive Method for the Determination of Silicon by Molecular Absorption Spectroscopy

“…A number of methods have been reported based on the formation of ternary molybdosilicate ion association complexes with certain basic dyes (3). Several indirect methods have been reported which are based on the determination of molybdenum after extracting the molybdosilicic acid (4,5). Of all these methods, the molybdenum blue method is the most popularly used which is also evident from the recent works (6,7).…”

Determination of reactive silicate in seawater by flow injection analysis

“…Various approaches to the analysis of dissolved silicon have been tried. Most of them are based on the formation of /3-molybdosilicic acid (3)(4)(5)(6)(7). Dissolved silicon exists in seawater almost entirely as undissociated orthosilicic acid.…”