all new & all automatic...
the Shimadzu AQV-50 digital spectrophotometer ideal for multiple analyses a n d column monitoring This versatile unit, which measures in the wide range from far u.v. to near infrared (183 to 1200 mw), now offers these new, exclusive automatic features: Automatic zero and 100% setting when standard sample is put in the optical path. Automatic digital display with data presented in %T or absorbance. This data can further be fed into a printer, recorder, or a tape puncher through the use of optional output driver. Automatic sample changer for up to 50 samples. Photometric Accuracy: ± 0 . 2 % T Reproducibility: ±0.1 %T standard deviation
DIGITAL READOUT Accessories available for reflectance studies, fluorescence, etc. FREE BOOKLET describes the accessories, operating features and comparative advantages of the versatile AQV-50. For your copy, write:
COSMOS SCIENTIFIC CO. 921 Bergen Ave., Jersey City, N.J. 07306 · (201) 925-1101 Stocking & Servicing Dealers: Ace Scientific Supply Co. Linden. New Jersey
Preiser Scientific Co. Charleston. West Virginia
Physiciens & Hospital Supply Co. Minneapolis. Minnesota
REPORT
Roger G. Bates is chief of the Electro chemical Analysis Section of the Na tional Bureau of Standards. He was graduated from the University of Mas sachusetts and received his Ph.D. de gree from Duke University in 1937. He has been a member of the staff of the National Bureau of Standards since 1939. His studies of electrolytic solutions and the standardization of pH brought him the Hillebrand Prize for 1955 of the Washington Section ACS and the gold medal for exceptional service from the Department of Commerce in 1957. Since 1 9 5 1 , Dr. Bates has been active in both the Analytical Chemistry Division and the Physical Chemistry Division of the Interna tional Union of Pure and Applied Chemistry. Dr. Bates is a member of the edi torial advisory boards of ANALYTICAL CHEMISTRY and Analytica Chimica Acta. He is a member of the ACS, the Washington Academy of Sciences, Phi Beta Kappa, Sigma Xi, Phi Kappa Phi, and the Cosmos Club.
(1) R. G. Bates and R. Gary, J. Res. Nat. Bur. Stand., 65A, 495 (1961). (2) P.. G. Bates, "Determination of pH, Theory and Practice," John Wiley and Sons, New York (1964), chap. 4 and 7. (3) British Standard 1647: 1961, "Spec ification for pH Scale," British Stan dards Institution, London. (4) D. J . Alner, J. J. Greczek, and A. G. Smeeth, / . Chem. Soc, 1967, 1205. (5) R. G. Bates, M. Paabo, and R. A. Robinson, J. Phys. Chem., 67, 1833 (1963). (6) M. Paabo, R. A. Robinson, and R. G. Bates, J. Amer. Chem. Soc, 87, 415 (1965). (7) P . K. Glasoe and F . A. Long, J. Phys. Chem., 64, 188 (1960). (8) P. Salomaa, L. Schaleger, and F. A. Long, J. Amer. Chem. Soc., 86, 1 (1964). (9) Λ. K. Covington, M. Paabo, R. A. Robinson, and R. G. Bates, AXAL. CHEM., 40, 700 (1968).
(10) R. Gary, R. G. Bates, and R. A. Robinson, / . Phys. Chem., 68, 1186 (1964). Circle No. 40 on Readers' Service Card
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