ANALYTICAL CHEMISTRY, VOL. 50, NO. 9, AUGUST 1978
1359
Distribution Coefficients and Anion Exchange Behavior of Some Elements in Hydrobromic-Nitric Acid Mixtures F. W. E. Strelow National Chemical Research Laboratory, P.O. Box 395, Pretoria 000 7, Republic of South Africa
Anion exchange distribution coefficients with Bio-Rad AGl-X8, a quaternary amine resin on polystyrene basis, are presented for the elements B i ( I I I ) , Cd, Pb(II), Zn, and I n ( I I 1 ) In hydrobromic-nitric acid mixtures ranging from 0.03 to 1 M hydrobromic and nil to 2 M nitric acid. The results are discussed and some possible separations are pointed out. The versatility of these eluting mixtures is demonstrated by sequential elution of Zn, Pb(II), Cd, and BI(II1) from a 11.5-mL resln column using appropriate eluting agent concentrations.
Table I. Distribution Coefficients in 0.03 M HBr element Bi(III)=
a=
Pb(I1)" Zn In
nil
0.1 M
>lo4 >lo4
molaritv of HNO, 0.2 M 0.5 M 1.OM
>lo4
191 8.2 14.4 Cd > Pb(I1) > Zn > In(II1) > Cu(I1) similar to the sequence in pure hydrobromic acid. The elements are less strongly adsorbed from the mixed acid, but separation factors are often as large and sometimes even larger than in the pure acid.
LITERATURE CITED (1) T. Andersen and A. B. Knutsen, Acta Chem. Scand., 16, 849 (1962). (2) F. W. E. Strelow and F. von S. Toerien, Anal. Chem., 38, 545 (1966). (3) F. W. E. Strelow, W. J. Louw, and C. H.S. W. Weinert, Anal. Chem.. 40, 2021 (1968). (4) F. Nelson and K. A. Kraus, J . Am. Chem. Soc., 76, 5916 (1954). (5) S. Onuki, Jpn. Anal., 12, 844 (1963). (6) F. Feik and J. Korkisch, Talanta, 11, 1585 (1964). (7) S. S. Ahluwalia and J. Korkisch, 2. Anal. Chem., 208, 414 (1965). (8) J. S. Fritz and R. G. Greene, Anal. Chem., 35, 811 (1963). (9) J. S. Fritz and E. B. Garralda, Anal. Chem., 34, 102 (1964). (10) 2. Sulzek, P. Povondra, and V. Kratochvil, Collect. Czech. Chem. Commun., 34, 3711 (1969). (11) F. W. E. Strelow, Anal. Chim. Acta, in press. (12) F. W. E. Strelow, Anal. Chim. Acta, accepted for publication.
RECEIVED for review February 21, 1978. Accepted May 18, 1978.
