Gas chromatographic separation of hydrogen cyanide on Porapak Q. Analysis of trace aqueous solutions

Direct determination and calculation of aqueous hydrogen sulfide

“…With this method a distribution equilibrium is established between the concentration of HCN in solution and in finely dispersed air or nitrogen bubbled through the sample. Displaced HCN, which is collected in one of several types of concentration columns, can be analyzed by various procedures (7)(8)(9). The procedure developed for H2S and reported here closely resembles in principle that described by Broderius (10) where the displaced and collected HCN was determined by a colorimetric method.…”

Determination of hydrocyanic acid and free cyanide in aqueous solution

“…Several methods have been described for the direct determination of HCN in aqueous solution. Methods based on establishing a distribution equilibrium between the concentration of HCN in water and in air or nitrogen bubbled through the water were described by Worley and Browne (8), Schneider and Freund (9), Claeys and Freund (10), and Nelson and Lysyj (11). The methods differ in the ways in which the displaced HCN is trapped and then measured.…”