Graduate Thesis Or Dissertation
 

Flame ionization detection of hydrocyanic acid ; Analysis of trace aqueous solutions

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/rv042x220

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  • A gas chromatographic procedure was developed for the determination of nanogram quantities of hydrocyanic acid using a flame ionization detector. Excellent chromatograms were obtained on a porous polyaromatic polymer column (Porapak Q) at 60°C. The procedure was employed for the analysis of HCN in aqueous cyanide solutions. Solutions as low as 1μg /liter (ppb) HCN were analysed in five minutes after a 30 minute concentration period in which air is swept through the solution and HCN collected in a cold trap for gas chromatographic analysis. When interferences are encountered on the Porapak Q column preliminary separation is achieved on a 1, 2, 3-tris(2-cyanoethoxy)-propane (TCEP) on Chromosorb W column. The HCN is trapped from the TCEP column effluent and reinjected on a Porapak Q column for analyses. The amount of chloroform in chlorinated water was also determined by this procedure, Deactivated diatomaceous earth supports and the fluorocarbon supports were evaluated for the determination of trace quantities of HCN. These supports were either inefficient or adsorption on the solid support caused severe tailing. Several stationary phases were investigated. Best results were obtained with Carbowax 1540 or 1, 2, 3-tris(2-cyanoethoxy)-propane when Chromosorb W was used as a solid support.
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