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Download Advances in Photochemistry by James N. Pitts, etc. PDF

By James N. Pitts, etc.

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If information on dissolved metals only is required, the sample may be filtered (using a specified pore size) before analysis. Losses may occur however, by adsorption during filtration. 5 Geochemical and Mineralogical Samples Silicate analysis is not without problems. If measurement of silicon is not required, it may be volatilized off as silicon tetrafluoride, using hydrofluoric acid, although some calcium may be lost as calcium fluoride. Alternatively, sodium carbonate-boric acid fusions may be employed.

At. Absorpt. Newsl. 15, 33 (1976). This paper gives a good account of the analytical performance of electrodeless discharge lamps]. High intensity is not a source requirement in AAS and therefore electrodeless discharge lamps will not replace hollow-cathode lamps. 3 Cutaway diagram of an RF-excited electrodeless discharge lamp. Page 23 and selenium), the signal-to-noise ratio, because of the low signal, may so adversely affect detection limits that electrodeless discharge lamps can offer improvements.

The choice of filler gas depends on whether the emission lines of the gas lie close to useful resonance lines and on the relative ionization potentials of the filler gas and cathode materials. The ionization potential of neon is higher than that of argon, and the neon spectrum is also less rich in lines. Therefore, neon is more commonly used. Modern hollow-cathode lamps require only a very short warm-up period. Lifetimes are measured in ampere hours (usually they are in excess of 5 A h). A starting voltage of 500 V is useful, but operating voltages are in the range 150-300 V.

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