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DCP incurs several key disadvantages in comparison to ICP. In addition to the lower sensitivity, spectra generated by DCP generally present fewer spectral lines. DCP samples are often incompletely volatilized due to the relatively short amount of time spent in the hottest region of the plasma.
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gas source is situated between the anode blocks and argon gas flows through the anode blocks. The plasma stream is produced by briefly contacting the cathode with the anodes. Temperatures at the arc core exceed 8000 K. This three-electrode arrangement is illustrated in Figure 1.
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Melechko, A. V.; Merkulov, V. I.; McKnight, T. E.; Guillorn, M. A.; Klein, K. L.; Lowndes, D. H.; Simpson, M. L. (15 February 2005). "Vertically aligned carbon nanofibers and related structures: Controlled synthesis and directed assembly".
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However, DCP is not without a few advantages over ICP. The amount of argon needed for DCP is much less than that needed for ICP. Also, DCP can analyze samples that have a higher percentage of solid in solution than can be handled by ICP.
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Barth, Rolf F.; Adams, Dianne M.; Soloway, Albert H.; Mechetner, Eugene B.; Alam, Fazlul.; Anisuzzaman, Abul K. M. (1991). "Determination of boron in tissues and cells using direct-current plasma atomic emission spectroscopy".
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Figure 2: A chemical vapor deposition chamber in which DCP (giving off the violet light) is being used to assist in the growth of carbon nanotubes.
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Furthermore, DCP requires more regular upkeep than ICP, because the graphite electrodes wear out after a few hours and must be exchanged
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The applications of DCP are comparable to inductively coupled plasma (ICP). Some applications include, but are not limited to:
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Skoog, D. A.; Holler, F. J.; Crouch, S.R. Principles of
Instrumental Analysis, 6th ed., Brooks Cole, 2007; pp. 258-259.
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Figure 1: Schematic of a three-electrode, argon DCP source. Note the inverted-'Y' shape of the plasma column.
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226:"Determination of Markers in Digesta and Feces by Direct Current Plasma Emission Spectroscopy"
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stream. The most common three-electrode DCP apparatus consists of two
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Figure 2 shows DCP being used to grow carbon nanofibers.
57:block arranged in an inverted-Y arrangement. An
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224:Combs, D.K.; Satter, L.D. (1992).
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243:10.3168/jds.S0022-0302(92)77977-6
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33:atomic emission spectroscopy
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268:Journal of Applied Physics
230:Journal of Dairy Science
274:(4): 041301–041301–39.
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25:Direct-current plasma
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308:Analytical chemistry
191:Analytical Chemistry
86:in tissues and cells
35:that utilizes three
280:2005JAP....97d1301M
203:10.1021/ac00009a010
82:identification of
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288:10.1063/1.1857591
164:"NMSU: DC Plasma"
98:carbon nanofibers
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236:(8): 2176–2183.
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170:on 2012-01-11
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172:. Retrieved
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91:trace metals
89:analysis of
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66:Applications
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174:2012-04-24
120:References
37:electrodes
302:Category
52:tungsten
45:graphite
276:Bibcode
252:1401369
211:1858981
93:in cows
55:cathode
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41:plasma
84:boron
59:argon
48:anode
248:PMID
207:PMID
147:ISBN
284:doi
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29:DCP
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
