A KINETIC METHOD FOR DETERMINING THE CARB ON OXIDE IN THE AIR WITH THE SILVER COMBINATION OF THE P-SULPHAMIDOPHENOXYACETIC ACID

The carbon oxide reduces the alkaline solution in an equimolecular mix ture of silver nitrate, to which sodium p - sulphamidophenoxy acetate was added, forming an intensely coloured and highly stable silver sol; its light adsorbance, measured at 400 nm grows proportionally with th e samples carbon oxide content. The relation describing the reaction t ime evolution, under stirring was established, with the possibility to calculate the silver sol light adsorbance, in case of the complete ga s-reagent reaction, based on knowing the light adsorbance at a certain moment. The light adsorbance representation for the total reaction (e stablished through calculation), function of the carbon oxide content of some known samples allows tracing the standardization curve, based on which the carbon oxide concentration in the unknown samples is calc ulated. The optimum concentration range is of 5-1000 ppm CO, the error s being not in excess of 3%.