Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jcrgr.272..829p&link_type=abstract
Journal of Crystal Growth, Volume 272, Issue 1-4, p. 829-835.
Physics
Scientific paper
Two solid-state colorimetric sensors for the precursors (Me2Cd, Pri2Te, Hg) and the by-product dimethylmercury (Me2Hg) produced in the growth of mercury cadmium telluride by metal organic vapour phase epitaxy are described. KMnO4 adsorbed onto silica gel exhibits a colour change from pale purple to brown in a non-reductive carrier gas at Me2Cd, Pri2Te, Hg, and Me2Hg gas-phase concentrations of 8, 3, 69 and 13 ppm, respectively. Niobium pentachloride, which can also be used in a hydrogen atmosphere, is found to change its colour from yellow to orange in the presence of gaseous Me2Hg, or to black with Me2Cd or Pri2Te at concentrations of 26, 23 and 8 ppm, respectively. Water used for rinsing reactor glassware that has been washed with acid post-deposition can contain 0.3 g dm-3 of mercury salts. This has been purified by the use of a column of ion-exchange resin. A colorimetric sensor for determining when the ion-exchange resin is saturated is described. Alcoholic solutions of 1,5-diphenylcarbazone are shown to be capable of detecting Hg2+ ions in water samples yielding a colour change from orange to purple at concentrations >7 ppm.
Blacker Nicholas J.
Cole-Hamilton David J.
Hails Janet E.
Pardoe Jennifer A. J.
Porter Keith A.
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