Total Organic Carbon and Gas Chromatography: Mass Spectroscopic Methods to Determine Total Carbon and Hydrocarbons in Mercuric Iodide Single Crystals.

摘要

Total organic carbon was by measuring the CO(sub 2) produced by combustion in a sealed quartz vessel. The CO(sub 2) was quantified by nondispersive IR and by titration using commercial detectors. The total organic carbon was found to be around 10 to 100 mu g/g in both starting materials and in single crystals. Gas chromatography--mass spectroscopy (GC/MS) measurements were made hexane extracts of mercuric iodide (HgI(sub 2)) dissolved in potassium iodide solution. Hydrocarbons starting with C(sub 10)(DIENE) and up to C(sub 26) were found. In addition, phthalates, such as diethyl and dioctyl phthalate were also found. Some of the organic compounds, for example, such hydrocarbons as branched nC(sub 16), nC(sub 20), nC(sub 21), nC(sub 22), nC(sub 23), and nC(sub 24), were present in some HgI(sub 2) materials in quantities of the order of weight ppM, but were eliminated in the purification process and were not found in the single crystals. Other organic compounds such as the phthalates were not always eliminated and were identified in the single crystals. In general, the GC/MS could identify only hydrocarbons of C(sub 10) and higher could account for few percentages of the total organic carbon determined by oxidation. 10 refs., 7 figs., 4 tabs. (ERA citation 13:049156)