Chemistry International
Vol. 24, No. 6
November 2002
Highlights
from Pure and Applied Chemistry
Potentiometric
Selectivity Coefficients of Ion-Selective Electrodes
Part
II. Inorganic Anions (IUPAC Technical Report)
by
Y. Umezawa, K. Umezawa, P. Bühlmann, N. Hamada, H. Aoki, J. Nakanishi,
M. Sato, K. P. Xiao, and Y. Nishimura
Pure and Applied
Chemistry, Vol.
74, No. 6, pp. 923-994 (2002)
Part
III. Organic Ions (IUPAC Technical Report)
by Y. Umezawa, P. Bühlmann, K. Umezawa, and N. Hamada
Pure and Applied
Chemistry, Vol.
74, No. 6, pp. 995-1099 (2002)
An earlier
IUPAC data compilation of potentiometric selectivity coefficients, K(A,B)pot,
for ion-selective electrodes (ISEs) was published in 1979 (Pure Appl.
Chem. 51, 1913-1980 [1979]). It covered data reported from 1966
to 1977 and was later followed by another extensive compilation of such
data in a handbook from CRC Press (Y. Umezawa [ed.], Handbook of
Ion-Selective Electrodes: Selectivity Coefficients, CRC Press, Boca
Raton, FL [1990]). The latter covered most of the K(A,B)pot
data reported from 1966 to 1988. An updated compilation produced in
1998 was limited to a number of particularly selective ionophores (P.
Bühlmann et al., Chem. Rev. 98, 1593-1687 [1998]). Very
recently, a data compilation of selectivity coefficients for ionophore-based
cation-selective electrodes was published as part I of this series (Pure
Appl. Chem. 72,
1851-2082 [2000]).
These
two most recent reports compile the latest K(A,B)pot
data for liquid-membrane ISEs for inorganic-anions (part II) and organic
ions (part III) based on neutral and charged ionophores, reported between
1989 and the end of 1998. Moreover, this new compilation also contains
some older data that had not been included in the CRC handbook. The
presented K(A,B)pot data are listed together
with the methods and conditions for their determinations; also tabulated
are response slopes, linear concentration (activity) ranges, chemical
compositions, and ionophore structures for the corresponding ISE membranes.
Selectivity coefficients can be measured with different methods that
fall into two main groups, namely (1) mixed solution methods, and (2)
separate solution methods. The details of the definition of each method
have been briefly discussed in the first part of this series.
www.iupac.org/publications/pac/2002/7406/7406x0923.html
www.iupac.org/publications/pac/2002/7406/7406x0995.html