Direct current plasma atomic emission

Instrumental Quantitative Analysis. Methods such as x-ray spectroscopy, oaes, and naa do not necessarily require pretreatment of samples to soluble forms. Only reUable and verified standards are needed. Other instmmental methods that can be used to determine a wide range of chromium concentrations are atomic absorption spectroscopy (aas), flame photometry, icap-aes, and direct current plasma—atomic emission spectroscopy (dcp-aes). These methods caimot distinguish the oxidation states of chromium, and speciation at trace levels usually requires a previous wet-chemical separation. However, the instmmental methods are preferred over (3)-diphenylcarbazide for trace chromium concentrations, because of the difficulty of oxidizing very small quantities of Cr(III). 

The XRD and TEM showed that the bimetallic nanoparticles with Ag-core/Rh-shell structure spontaneously form by the physical mixture of Ag and Rh nanoparticles. Luo et al. [168] carried out structure characterization of carbon-supported Au/Pt catalysts with different bimetallic compositions by XRD and direct current plasma-atomic emission spectroscopy. The bimetallic nanoparticles were alloy. Au-core/Pd-shell structure of bimetallic nanoparticles, prepared by co-reduction of Au(III) and Pd(II) precursors in toluene, were well supported by XRD data [119]. Pt/Cu bimetallic nanoparticles can be prepared by the co-reduction of H2PtClg and CuCl2 with hydrazine in w/o microemulsions of water/CTAB/ isooctane/n-butanol [112]. XRD results showed that there is only one peak in the pattern of bimetallic nanoparticles, corresponding to the (111) plane of the PtCu3 bulk alloy. 

DCP-AES Direct-current plasma atomic emission spectrometry... 

GFAAS = graphite furnace (flameless) atomic absorption spectroscopy MCAAS = micro-cup atomic spectroscopy DCOP-AES = direct current plasma-atomic emission spectroscopy HFP-AES = high frequency piasma-torch-atomic emission spectroscopy NAA - neutron activation analyst-, atomic absorption spectroscopy AAS - atomic absorption spectrophotometer XES = X-ray energy spectrometry and SEM - scanning electron microscopy. 

Direct Current Plasma Atomic Emission Spectrograph... 

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). 

As mentioned before, two interlaboratory studies were organised prior to certification, involving ca. 15 laboratories using techniques such as cold vapour atomic absorption spectrometry, direct current plasma atomic emission spectrometry (DCP-AES), differential pulse anodic stripping voltammetry (DPASV), microwave plasma atomic emission spectrometry (MIP-AES), electrothermal atomic absorption spectrometry (ETAAS) and neutron activation analysis with radiochemical separation (RNAA). 

Bercowy GM, Vo H and Rifders F (1994) Silicon analysis in biological specimens by direct current plasma-atomic emission spectroscopy. ] Anal Toxicol 18 46 -48. 

Techniques under this heading obviously include the most common and popular one of inductively coupled plasma atomic emission spectrometry (IGPAES), also at times simply denoted plasma emission spectrometry, but can also be extended to include direct current plasma atomic emission spectrometry (DGPAES) and graphite furnace IGPAES as well as variants. 

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... 

DCPAES direct current plasma atomic emission spectroscopy... 

Panaro, K.W., Erickson, D., and Krull, I.S. (1987) Determination of methylmercury in fish by gas chromatography direct current plasma atomic emission spectrometry. Analyst, 112, 1097-1105. 

Analytical methods of atomic spectroscopy have been used in forestry and wood product research since their earliest development. Nowadays, almost all of the spectroscopic techniques available are employed in the analysis of metals and trace elements in diverse samples of industrial and environmental origin. The techniques that find most regular application include flame atomic absorption spectroscopy (F-AAS), graphite furnace atomic absorption spectroscopy (GF-AAS), inductively coupled plasma atomic emission spectroscopy (ICP-AES) and, occasionally, also direct current plasma atomic emission spectroscopy (DCP-AES). In many applications F-AAS is a sufficiently sensitive and precise technique however, in the analysis of some environmental samples for trace elements (forest soils, plant material and water) where concentrations may be very low (of the order of 100 ng mL" ) the greater sensitivity of GF-AAS and ICP/DCP-AES is required. In considering the applications of atomic spectroscopy to forestry and... 

The capabilities of direct current plasma atomic emission spectrometry as a powerful IC detection system for As(III) and As(V) was evaluated by Urasa and Ferede [42]. The presence of several common anions was studied. One fundamental drawback of DCP in this particular work appeared to be low sensitivity. But the use of a large sample loop or concentrator column provided improvement. 

W.R. Biggs, J.T. Gano, and R.J. Brown. Determination of polyphosphate distribution by liquid chromatographic separation with direct current plasma-atomic emission spectrometric detection. Anal. Chem., 56(14), 2653 (1984). 

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