AES—See Atomic emission spectrometry

ICP-OES—also sometimes referred to as ICP-AES for atomic emission spectroscopy) and ICP-mass spectrometry (ICP-MS) also see Chapter 15. 

Atomic absorption spectrometry. See AAS Atomic emission spectrometry. See AES... 

Inductively coupled plasma atomic emission spectrometry. See ICP-AES... 

Internal standards are also used in trace metal analysis by inductively coupled plasma atomic emission spectrometry (ICP-AES) and inductively coupled plasma mass spectrometry (ICP-MS) techniques. An internal standard solution is added to ICP-MS and ICP-AES samples to correct for matrix effects, and the response to the internal standard serves as a correction factor for all other analytes (see also chapter 2). 

Many of the analytical methods for detecting vanadium in biological samples have also been used to measure vanadium in environmental samples. They are detailed in Table 6-2. These include GFAAS, spectrophotometry, IDMS, and ICP-AES. Other techniques employed for measuring vanadium in environmental samples are flame atomic absorption spectrometry (FAAS) and direct current plasma- atomic emission spectrometry (DCP-AES). The most widely used methods utilize some modification of atomic absorption spectrometry (AAS). In general, similar methods are employed for preparation and clean up of environmental and biological samples prior to quantification of vanadium (see Section 6.1). 

DCP-AES direct current plasma atomic emission spectrometry DCP-OES direct current plasma optical emission spectrometry see DCP-AES DELEIA dissociation-enhanced lanthanide fluoroimmunoassay demyeUnation removal of the myelin sheath of a nerve... 

Many methods used for qualitative analysis are destmctive, that is, the sample is consumed during the analysis or must be chemically altered in order to be analyzed. The most sensitive and comprehensive elemental analysis methods for inorganic analysis are inductively coupled plasma atomic emission spectrometry (ICP-OES or ICP-AES), discussed in Chapter 7, and ICP-MS, discussed in Chapters 9 and 10. These techniques can identify almost all the elements in the periodic table, even when only trace amounts are present, but often require that the sample be in the form of a solution. If the sample is a rock or a piece of glass or a piece of biological tissue, the sample usually must be dissolved in some way to provide a solution for analysis. We will see how this is done later in the chapter. The analyst can determine accurately what elements are present, but information about the molecules in the sample is often lost in the sample preparation... 

Atomic-emission spectrometry with inductively coupled plasma (ICP-AES, see also Chapter 2)... 

Conventional ICP atomic emission spectrometry (ICP-AES) is not sensitive enough to allow the determination of dissolved trace elements in seawater. It might, however, majorly be applied in the analysis of collected particulate material. The technique combines fast multi-element measurements with somewhat lower investment costs when compared with ICP-MS (see Section 12.6). 

Flame, flame atomic emission (see Topic E4) ICP-AES, Inductively coupled plasma-atomic emission spectrometry ICP-MS, Inductively coupled plasma-mass spectrometry. 

Knowledge of the atomic spectra is also very important so as to be able to select interference-free analysis lines for a given element in a well-defined matrix at a certain concentration level. To do this, wavelength atlases or spectral cards for the different sources can be used, as have been published for arcs and sparks, glow discharges, and inductively coupled plasma atomic emission spectrometry (see earlier). In the case of ICP-OES, for example, an atlas with spectral scans around a large number of prominent analytical lines [378] is available, as well as tables with normalized intensities and critical concentrations for atomic emission spectrometers with different spectral bandwidths for a large number of these measured ICP line intensities, and also for intensities calculated from arc and spark tables [383]. The problem of the selection of interference-free lines in any case is much more complex than in AAS or AES work. 

In 1C, the election-detection mode is the one based on conductivity measurements of solutions in which the ionic load of the eluent is low, either due to the use of eluents of low specific conductivity, or due to the chemical suppression of the eluent conductivity achieved by proper devices (see further). Nevertheless, there are applications in which this kind of detection is not applicable, e.g., for species with low specific conductivity or for species (metals) that can precipitate during the classical detection with suppression. Among the techniques that can be used as an alternative to conductometric detection, spectrophotometry, amperometry, and spectroscopy (atomic absorption, AA, atomic emission, AE) or spectrometry (inductively coupled plasma-mass spectrometry, ICP-MS, and MS) are those most widely used. Hence, the wide number of techniques available, together with the improvement of stationary phase technology, makes it possible to widen the spectrum of substances analyzable by 1C and to achieve extremely low detection limits. 

Methods for quantitative analysis of Co indude flame and graphite-furnace atomic absorption spectrometry (AAS e.g., Welz and Sperling 1999), inductively coupled plasma emission spectrometry (ICP-AES e.g., Schramel 1994), neutron activation analysis (NAA e.g., Versieck etal. 1978), ion chromatography (e.g., Haerdi 1989), and electrochemical methods such as adsorption differential pulse voltammetry (ADPV e.g., Ostapczuk etal. 1983, Wang 1994). Older photometric methods are described in the literature (e.g.. Burger 1973). For a comparative study of the most commonly employed methods in the analysis of biological materials, see Miller-Ihli and Wolf (1986) and Angerer and Schaller... 

OAS optical atomic spectrometry obstipation severe constipation OECD Organisation for Economic Cooperation and Development OES optical emission spectrometry OES-DCP See DCP-AES OES-ICP See ICP-AES OES-MIP See MIP-AES oliguria pathologically diminished excretion of urine... 

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