1955
DOI: 10.1021/ac60101a008 View full text |Buy / Rent full text
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Abstract: 725battery with one of higher voltage. I t is desirable to be able to compensate completely the photosignal arising from the full light of the source using maximum slit width a t the wave length of greatest phototube sensitivity, if this photosignal is to be read, for then the broadest use of Methods I11 and IV is possible. CONCLUSIONSThe conclusions of the paper may be summarized as follows:The manner of using the slit-width, sensitivity, and dark-current controls does have an effect on the relative error of … Show more

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“…Average respective values are calcium carbonate 76. 29 Comparison of the results for trace elements with those of others (table 2) is not very meaningful because of the miscellaneous nature of samples used. Runnels and Schleicher ( 26), for example, included materials which they considered hardly more than calcareous shales, containing a minimum of 22.15% calcium carbonate.…”
Section: Resultsmentioning
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“…Average respective values are calcium carbonate 76. 29 Comparison of the results for trace elements with those of others (table 2) is not very meaningful because of the miscellaneous nature of samples used. Runnels and Schleicher ( 26), for example, included materials which they considered hardly more than calcareous shales, containing a minimum of 22.15% calcium carbonate.…”
Section: Resultsmentioning
“…The study of rapid methods for the analysis of chromite is related to a general program of the U. S. Geological Survey which involves the re-examination of existing procedures in the light of recent advances in analytical techniques. A description of a major phase of this re-examination, applied to silicate rocl s, was recently published (Shapiro and Brannock, 1956).…”
Section: Discussionmentioning
“…The photometric titration apparatus used for the determination of magnesium and calcium is the same as that described by Shapiro andBrannock (1955, 1956).…”
Section: Automatic Photometric Titbation Apparatusmentioning
“…These two basic types of instrument can be adapted, with slight alterations, for several other analytical measurements. Automatic photometric titrations are reported by several authors (16,30,42). Linde et al (23) describe an apparatus for automatic thermometric titrations.…”
Section: P•447) Says Of Potentiometric Titrationsmentioning