The laser microprobe has been applied to the excitation of trace elements homogeneously distributed in powdered materials. Precision of intensity ratios is about ±11% (coefficient of variation), and detection levels are comparable to those of the dc arc. Matrix effects were studied for four different materials and found to be significantly less than in the dc arc. Use of the probe as the source in a “universal” method is suggested.
Get full access to this article
View all access options for this article.
References
1.
BrechF., Colloq. Spectros. Intern., 10th, College Park, Md., 1962, (oral presentation).
2.
BrechF., “Current Status and the Potentials of Laser Excited Spectrochemical Analysis,” Reprint No. 2 (Jarrel—Ash Co., Waltham, Mass.)
3.
RasberryS. D.ScribnerB. F., and MargoshesM., Appl. Opt.6, 87 (1967).
4.
Reference to specific makes or models of equipment is made to facilitate understanding and does not imply endorsement by the Bureau of Mines.
5.
“Tentative Recommended Practice for Designation of Shapes and Sizes of Graphite Electrodes,” in Methods for Emission Spectrochemical Analysis (ASTM, Philadelphia, Pa., 1964), 4th ed., Ch. E130–63T, pp. 110–112.
6.
“Tentative Recommended Practices for Photographic Processing in Spectrochemical Analysis,” Ref. 5, Ch. E115–59T, pp. 56–66.
7.
“Tentative Recommended Practices for Photographic Photometry in Spectrochemical Analysis,” Ref. 5, Ch. E116–59T, pp. 75–78.
8.
LytleF. W.BotsfordJ. I., and HellerH. A., U. S. Bur. Mines Rept. Invest.5378, 1–16 (1957).
9.
MichaelisR. E.YakowitzH., and MooreG. A., Natl. Bur. Std. Misc. Publ. 260–3 (1964).
10.
WhiteheadA. B.PiperB. C., and HeadyH. H., Appl. Spectry.20, 107 (1966).
11.
AhrensL. H., and TaylorS. R., Spectrochemical Analysis (Addison—Wesley Publishing Company, Inc., Reading, Mass., 1961), 2d ed., Ch. 6, p. 75, Table 6–1.
