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Suspended particulates in the Jamaican atmosphere (1997)

Davis, M. ; Grant, C. ; Ho-Yorck-Krui, G. ; [et al.]

Springer

Environmental geochemistry and health 19 (1997), S. 0-0

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ISSN: 1573-2983

Keywords: Atmospheric particulates ; bromine ; Jamaica ; lead

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences , Medicine

Notes: Abstract The results of a survey of air particulates at 23 sites across Jamaica for total suspended particulates (TSP), Al, Br, Cl, Na, Pb, and V, by instrumental neutron activation analysis (INAA) and X-ray fluorescence analysis (XRF) are reported. The geometric mean of TSP values, 35 g m-3, is well within the World Health Organisation's standard of 60 g m-3 for TSP, but in areas of high vehicular traffic density the TSP values exceeded this limit. The correlation coefficient between Br and Pb concentrations in the particulates was 0.92 and the Br/Pb ratio of 0.38 compares well with a ratio of 0.39 found in commercial petrol indicating that the exhaust from vehicular traffic is the major source of Pb in atmospheric particulate matter in Jamaica.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1018481901288

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Fourier transform Raman spectroscopic study of hydrogen bonding in 2,5-dimercapto-1,3,4-thiadiazole using an environmental chamberThis paper is dedicated to Professor D. A. Long on the occasion of his 70th birthday. (1995)

Lawson, E. E. ; Edwards, H. G. M. ; Johnson, A. F.

Chichester [u.a.] : Wiley-Blackwell

Journal of Raman Spectroscopy 26 (1995), S. 617-622

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ISSN: 0377-0486

Keywords: Chemistry ; Analytical Chemistry and Spectroscopy

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Physics

Notes: The bands at 2485 and 940 cm-1 observed in the Raman spectra of 2,5-dimercapto-1,3,4-thiadiazole represent the hydrogen-bonded ν(SH) stretching and δ(C-SH) in-plane bending modes, respectively. A quantitative study of the hydrogen bonding was carried out using intensity measurements of the bands assigned to the hydrogen-bonded and the free δ(C-SH) in-plane deformations at 940 and 919 cm-1, respectively, as a function of temperature. The Fourier transform (FT) Raman spectra were recorded over the temperature range 303-403 K using an environmental chamber fitted into the FT Raman sample compartment. The equilibrium constants between the free and the hydrogen-bonded molecules were determined over this temperature range and the average enthalpy for hydrogen-bond formation was obtained (ΔH° = -3.35 ± 0.2 kJ mol-1).

Additional Material: 9 Ill.