V O L U M E 2 7 , NO. 1, J A N U A R Y 1 9 5 5 equal molar solutions are a measure of the relative total polarization of the solute molecules. Thus the relative total polarization of the various metal chelates should be in the order, nickel>> cobalt> copper. The greater the polarization the greater the strength of adsorption. Comparison of the solubility and polarization data indicate. that the relative R/ values fall in a logical sequence: Solubility Co >> Cu, Ni Polarization Ni > > Co > Cu R/ values Co > Cu > h-i The small difference in solubility of the copper and niclwl chelates coupled with the large polarization of the nickel chelatv gives a Rj sequence copper > nickel, whereas the much large] solubility of the cobalt chelate coupled with only a slightly largrr polarization than the copper chelate gives a R/ sequence cobalt > copper. Thus the relative Rj values can be explained qualitatively by these two factors. Another p-diketone chelate system has been studied by the authors (not yet published) in which five chelates have been measured with a similar correlation hetwren solubility, polarization, and R, values. LITERATURE CITED (1) -41-3lahdi. A. K.. and Wilson. C. L.. M i k r o c h m i t cer. M i k r o c h i t ~ r . Acta, 36/37, 218 (1951): 40, 138 (1952).
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(1951). Berg. E. W.,and McIntyre, It. T., ANAL.CHEX, 26, 813(1954). ( 5 ) Burstall, F. IT., Davies, G. R.. Linstead, R. P., and Wells, R . d., J. Chem. Soc., 1950,51G. ( 6 ) Erlenmeyer, €1.. and Dahn, IT., Helv. Chim. iicta. 22, 1369 (1939). (7) Fernando, Q., and Phillips. J. P., .\NAL. CHEM..25, 819 (1953). (8) Gach, F., Monatsh., 21,98 (1900). (9) Laskowki, D. E.. and hlcCrone, W . ’ C . ,ANAL.C m x . , 23, 1579 (1951). (10) llartell. d.E., and Calvin, 31.. “Chemistry of the Metal Chelate Compounds.” Kew York, Prentice-Hall, Ino., 1952. (11) Pollard. F. H., AIcOmie, J. F. W., and Elbeih, I. I. l I . , , J , L / I P M . SOC..1951.460.470. (12) Pollard, F. H., lIcOmie, J. F. W..and Elbeih, I. I. M., Dtscicssions Faraday Soc., No. 7, 183 (1949). (13) Pollaid, F. H., llcOmie, J. F. W., and Stevens, H. XI., J . C h ~ m . Soc., 1951,771; 1952,4730. (14) Reeves, W. -1..and Crumuler. T. n.. ANAL. CHEM.. 23. 1576 (1951). (15) Venturello, G., and Ghe. A . 11.. Bnn. chim. (Rome), 43, 267 (1963). (16) Welcher, F. J., “Organic .\nalytical Reagents,” New T o i k . n. Van Nostrand Co., 1947 (4)
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