Artículos de revistas
A Continuous Flow Cold Vapour Procedure For Mercury Determination By Atomic Emission Using The Reverse Flow Injection Approach
Registro en:
Spectrochimica Acta Part B: Atomic Spectroscopy. , v. 49, n. 8, p. 787 - 795, 1994.
5848547
10.1016/0584-8547(94)80070-7
2-s2.0-0028462233
Autor
De Andrade J.C.
Bueno M.I.M.S.
Institución
Resumen
An experimental set-up for on-line Hg2+ reduction and determination was devised using the reverse flow injection analysis (r-FIA) concept and the cold vapour (CV) technique, injecting an acidic Sn2+ solution into the mercury sample line. The elemental mercury generated is separated from the reacting mixture by a 100 ml min-1 helium stream, which passes through a gas-liquid separator connected to a permeation cell. This gas stream is used as the plasma medium. The permeated Hg° is then concentrated on a 0.3 g gold foil placed inside a quartz tube connected to an 11 W He de discharge plasma chamber. The mercury retained on the gold surface is released by resistive heating and the emission intensity is observed at the 253.7 nm mercury line. For an injection cycle of 30 s, the calibration graphs are linear up to 50 ng ml-1(itr2 = 0.999). An injection frequency of 120 h-1 is achieved, with negligible carry-over. The calculated relative standard deviation of the transient peaks is 1.6%. Higher sensitivities can be achieved using longer injection cycles. Samples of Human Hair Certified Reference Material were used to determine the accuracy of the method. © 1994 Elsevier B.V. All rights reserved. 49 8 787 795 Standardization of methods for the determination of traces of mercury Part 5—Determination of total mercury in water (1979) Analytica Chimica Acta, 109, p. 209 Tanabe, Chiba, Haraguchi, Fuwa, (1981) Anal. Chem., 53, p. 1450 Thompson, Coles, (1984) Analyst, 109, p. 529 Nojiri, Otsuki, Fuwa, (1986) Anal. Chem., 58, p. 544 Powell, Quan, Boomer, Wiederin, (1992) Anal. Chem., 64, p. 2253 Resto, Badini, Smith, Stevenson, Winefordner, (1993) Spectrochim. Acta, 48 B, p. 627 Sinemus, Stablel, Radzuik, Kleiner, (1993) Spectrochim. Acta, 48 B, p. 643 Poluéktov, Vitkum, Zelyukova, (1964) Zh. Anal. Khim., 19, p. 937 Poluéktov, Vitkum, Zelyukova, (1965) Anal. Abstr., 12, p. 6402 Hatch, Ott, (1968) Anal. Chem., 40, p. 2085 Oda, Ingle, Jr, (1981) Anal. Chem., 53, p. 2030 Sturman, (1985) Appl. Spectrosc., 39, p. 48 Fang, Analytical methods and techniques (1989) Flow Injection Atomic Spectroscopy, , J.L. Burguera, Marcel Dekker, Inc, New York, chap. 4 Hanna, Tyson, McIntosh, (1993) Anal. Chem., 65, p. 653 Stroh, Völlkopf, (1993) J. Anal. At. Spectrom., 8, p. 35 Braman, Dynako, (1968) Anal. Chem., 40, p. 95 Braman, (1971) Anal. Chem., 43, p. 1462 Braman, Johnson, (1974) Environ. Sci. Technol., 8, p. 996 Johnson, Braman, (1974) Environ. Sci. Technol., 8, p. 1003 Bricker, (1980) Anal. Chem., 52, p. 492 Corns, Ebdon, Hill, Stockwell, (1992) Analyst, 117, p. 717 De Andrade, Pasquini, Baccan, Van Loon, (1983) Spectrochim. Acta, 38 B, p. 1329 Johnson, Petty, (1982) Anal. Chem., 54, p. 1185 Reis, Zagatto, Jacintho, Krug, Bergamin FXXX, Merging zones in flow injection analysis (1980) Analytica Chimica Acta, 119, p. 305 (1985) Standard Methods for the Examination of Water and Wastes, p. 232. , 16th Edn, American Public Health Association, Washington, DC Nomenclature, symbols, units and their usage in spectrochemical analysis—II. Data interpretation (1978) Spectrochim. Acta, 33 B, p. 245 Okamoto, (1985) NIES Certified Reference Material, Human Hair, , National Institute for Environmental Studies, Japan Environment Agency, Tsukuba