| Abstract: | Two spectrographic methods are used in mobile field laboratories of the U. S. Geological Survey. In the direct-current arc method, the ground sample is mixed with graphite powder, packed into an electrode crater, and burned to completion. Thirty elements are determined. In the spark method, the sample, ground to pass a 150-mesh screen, is digested in hydrofluoric acid followed by evaporation to dryness and dissolution in aqua regia. The solution is fed into the spark gap by means of a rotating-disk electrode arrangement and is excited with an alternating-current spark discharge. Fourteen elements are determined. In both techniques, light is recorded on Spectrum Analysis No. 1, 35-millimeter film, and the spectra are compared visually with those of standard films. |
| Genre: | USGS Numbered Series |
| ProdID: | 3848 |
| Citation Author: | Grimes, D. J.; Marranzino, A. P. |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | iii, 6 p. :illus. ;26 cm. |
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| Citation Publisher: | [U.S. Geological Survey], |
| Citation Series: | Circular |
| Citation Series Code: | CIR |
| Citation Series Number: | 591 |
| Citation Search Results Text: | Direct-current arc and alternating-current spark emission spectrographic field methods for the semiquantitative analysis of geologic materials; 1968; CIR; 591; Grimes, D. J.; Marranzino, A. P. |
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| Citation Year: | 1968 |
| Type: | citation/reference |
| Text: | Direct-current arc and alternating-current spark emission spectrographic field methods for the semiquantitative analysis of geologic materials; 1968; CIR; 591; Grimes, D. J.; Marranzino, A. P. |
| URL (THUMBNAIL): | http://pubs.usgs.gov/circ/1968/0591/report-thumb.jpg |
| URL (DOCUMENT): | http://pubs.usgs.gov/circ/1968/0591/report.pdf |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | [U.S. Geological Survey], |
