A C BRIEFS Spectrophotometric Method for Rapid Determination of Oak Leaf Condensed Tannin Simultaneous degradation of the tannin by sulfuric acid gives rise to colored solutions which can be analyzed spectrophotometrically to determine the original tannin concentration. PAUL FEENY, Department of Zoology, Oxford England
University,
Anal. Chem., 41, 1347 (1969) Measurement of Lead Isotopes by Differential Atomic Absorption The method uses standard AAS with minor modification; its geochronological promise equals or exceeds that of the P h alpha method, b u t cannot match the precision of mass spectrometric methods. WILL/S H. BR/MHALL, Department of Geology, Brigham Young University, Provo, Utah Anal. Chem., 41, 1349 (1969)
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