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May 16, 2012 - U. S. STONEWARE. Anal. Chem. , 1960, 32 (3), pp 48A–48A. DOI: 10.1021/ac60159a738. Publication Date: March 1960. ACS Legacy Archive...
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tensity and steadiness of the signals in flame photometry and atomic absorption spectroscopy. In both techniques, air-fuel ratio, flame position, and sample feed rate have important effects. Generally, said Robinson, flame photometry is most useful for determining group 1 and 2 elements and many transition elements. It is of little use for noble metals, the zinc sub-group, and non-metals. Atomic absorption spectroscopy works well for noble metals, the zinc sub-group, and transition elements, but not for the analysis of non-metals and metals such as aluminum and vanadium that form refractive oxides. Best operating conditions for the two methods vary widely. A low feed rate (0.06 ml. per min.) and use of the spectrum from the tip of the inner cone is best for flame photometry. On the other hand, atomic absorption spectroscopy works best with a feed rate limited to the rate of combustion of the solvent in the flame and with a signal from the flame's outer cone. Ion Exchange Separations. Several variations of ion exchange technique were described by Dr. James S. Fritz of Iowa State University. Complexing with EDTA (ethylenediamine tetraacetic acid) and close control of pH gives excellent quantitative separation of metal ions with short—five cm. —columns. On the basis of studies of individual ions, Dr. Fritz said that separation of mixtures may be predicted. Another use of ion exchange columns is separation of metal groups by

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U. S. STONEWARE AKRON 9. OHIO Circle No. 14G on Readers' Service Card 48 A

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U. S. and foreign speakers were on the LSU program. One of the foreign visitors. Dr. Robert Mitchell, Macaulay Institute for Soil Research, Aberdeen, Scotland (left) is shown with Dr. James W . Robinson, Esso Laboratories, Baton Rouge, La.