MCI Automatic Moisture Meter. Reliable, Fast and Easy. Incorporates coulometry principle applied to Karl Fischer titration. Operation is full-automatic. Measuring time is shortened. Accuracy is within 5,ug for 10,ug—lmg H2O and within 0.5% for 1—30mg H 2 0 . Wide-range applications include measurement of ultra-trace water content in liquids, solids and gases. Range: 10^g—30mg H2O. An optional water vaporizer for speedy and accurate measurement of water content in plastics, grain, etc.
Printer (optional,
(δ = 2.9 ppm), suggesting a CH 3 -CH-CH 2 group; and a singlet (δ = 1.5 ppm), which by deuterium exchange was shown to be from an -OH group. The 13C NMR spectra obtained from the white crystalline solid ( Ή coupled and decoupled) showed 14 magnetically nonequivalent carbon sites, their associated bondings, and the number of attached hydrogen atoms. We also saw that the phenyl ring was unsymmetrically trisubstituted. The chemical shifts of the satu rated carbons showed that the pentamethylindan structure was retained and that the additional groups (CH 3 -CH-CH 2 OH) were associated with the phenyl ring. Taking into account the above in formation together with the molecular formula of C17H26O, the white crystal line solid was identified as galaxolide alcohol.
CA-02 Moisture Meter with Printer
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2-(l,l,2,3,3-pentamethylindan-5-yl)propan-1-ol or galaxolide alcohol Conclusion
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The unknown pollutant was found to be a mixture of pentamethylindan and galaxolide alcohol, but these were unusual chemicals to be found floating on the surface of a lake. In fact, very little mention of them is made any where 'n chemical literature, and no reference spectra could be found for these compounds. Pure reference ma terials were obtained subsequently, and their IR, NMR, and mass spectra were found to match those of the sepa rated oil and white solid. Some "fin gerprint" matches are shown in Fig ures lb, 3b, and 4b. Identifying the compounds, how ever, solved only part of the mystery. The question still remained: Where had they come from? Actually, the rare occurrence of the compounds proved to be of assistance in tracing their source. Eventually it was found that a manufacturer of perfumery products used them as intermediates, that waste effluent from the factory was regularly disposed of by a contrac tor in a waste tip not far from the lake, and that material escaped from this waste tip into a channel connecting to the lake. Once this detective work was completed, the mystery had been solved. Adapted in part from European News, 1982, Vol. 40.
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644 A · ANALYTICAL CHEMISTRY, VOL. 55, NO. 6, MAY 1983
Spectroscopy
