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Atomic absorption spectrophotometry principles

Theory. Conventional anion and cation exchange resins appear to be of limited use for concentrating trace metals from saline solutions such as sea water. The introduction of chelating resins, particularly those based on iminodiacetic acid, makes it possible to concentrate trace metals from brine solutions and separate them from the major components of the solution. Thus the elements cadmium, copper, cobalt, nickel and zinc are selectively retained by the resin Chelex-100 and can be recovered subsequently for determination by atomic absorption spectrophotometry.45 To enhance the sensitivity of the AAS procedure the eluate is evaporated to dryness and the residue dissolved in 90 per cent aqueous acetone. The use of the chelating resin offers the advantage over concentration by solvent extraction that, in principle, there is no limit to the volume of sample which can be used. [Pg.212]

Atomic absorption spectrophotometry is identical in principle to absorption spectrophotometry described in the previous chapter. The absorption follows Beer s law. That is, the absorbance is directly proportional to the pathlength in the flame and to the concentration of atomic vapor in the flame. Both of these variables are difficult to determine, but the pathlength can be held constant and the concentration of atomic vapor is directly proportional to the concentration of the analyte in the solution being aspirated. The procedure used is to prepare a calibration curve of concentration in the solution versus absorbance. [Pg.525]

Describe the principles of flame emission spectrometry and of atomic absorption spectrophotometry. [Pg.537]

Atomic absorption spectrophotometry already then in its second edition. Price (1974) (Analytical Atomic Absorption Spectrometry) published about thelOth book on AAS since inception of the technique with the aim of being a textbook on practical AAS (FAAS). It contains the usual introduction to principles, instrumenttation and analytical techniques, with a large detailed chapter of applications to different materials followed by details for individual elements. A nice expanded version of the author s first book (Price 1979) on Spectrochemical Analysis by Atomic Absorption, includes newer developments such as EAAS. Kirkbright and Sargent (1974) (Atomic Absorption and Fluorescence Spectrometry) produced a massive, excellent, comprehensive treatise on the techniques of atomic absorption and fluorescence spectrometries, with details on... [Pg.1556]

See also Air Analysis Outdoor Air. Atomic Absorption Spectrometry Principles and Instrumentation. Atomic Emission Spectrometry Principles and Instrumentation. Environmental Analysis. Gas Chromatography Overview Principles Instrumentation. Liquid Chromatography Overview Principles Instrumentation. Personal Monitoring Active Passive. Quality Assurance Quality Control Instrument Calibration. Spectrophotometry Ovenriew Inorganic Compounds Organic Compounds. [Pg.65]

See also Atomic Absorption Spectrometry Principles and Instrumentation. Chiroptical Analysis. Chromatography Overview Principles. Clinical Analysis Glucose. Enzymes Enzyme-Based Electrodes. Food and Nutritional Analysis Overview. Infrared Spectroscopy Overview. Mass Spectrometry Overview. Nuclear Magnetic Resonance Spectroscopy Overview. Nuclear Magnetic Resonance Spectroscopy Applications Food. Optical Spectroscopy Detection Devices. Sampling Theory. Spectrophotometry Overview. Sweeteners. X-Ray Absorption and Diffraction Overview. [Pg.424]

See also Atomic Absorption Spectrometry Principles and Instrumentation. Atomic Emission Spectrometry Principles and Instrumentation. Elemental Speciation Overview. Food and Nutritional Analysis Sample Preparation. Ion-Selective Electrodes Overview. Quality Assurance Reference Materials. Sample Dissolution for Elemental Analysis Dry Ashing Oxygen Flask Combustion Wet Digestion Microwave Digestion. Spectrophotometry Inorganic Compounds. Titrimetry ... [Pg.1494]

Spectrophotometry utilizes the principle of atomic absorption to determine the concentration of a substance in a volume of solution. Transmission of light through a clear fluid containing an analyte has a reciprocal relationship to the concentration ofthe analyte, as shown in Figure 8.1b [2]. Percent transmission can be calculated as... [Pg.118]

This article provides some general remarks on detection requirements for FIA and related techniques and outlines the basic features of the most commonly used detection principles, including optical methods (namely, ultraviolet (UV)-visible spectrophotometry, spectrofluorimetry, chemiluminescence (CL), infrared (IR) spectroscopy, and atomic absorption/emission spectrometry) and electrochemical techniques such as potentiometry, amperometry, voltammetry, and stripping analysis methods. Very few flowing stream applications involve other detection techniques. In this respect, measurement of physical properties such as the refractive index, surface tension, and optical rotation, as well as the a-, //-, or y-emission of radionuclides, should be underlined. Piezoelectric quartz crystal detectors, thermal lens spectroscopy, photoacoustic spectroscopy, surface-enhanced Raman spectroscopy, and conductometric detection have also been coupled to flow systems, with notable advantages in terms of automation, precision, and sampling rate in comparison with the manual counterparts. [Pg.1275]

Spectrophotometric methods generally have lost their significance. Nevertheless in particular analyzers spectrophotometry is applied due to the simple practicability of the technique, less in the determination of sodium and potassium [24] but more frequently in the determination of calcium (e.g., Cresolphthalein). In calcium determination atomic absorption spectrometry (AAS) yields accurate results, so this method is used as reference method. Further alternative methods are ion chromatography [25] and isotope dilution-mass spectrometry. A rapid assay for determination of potassium is based on the principle of turbidimetry [26]. [Pg.17]


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