n Pvlonitar Monitor 197 m Award Youden award for Cliff Spiegelman (and our journal) Cliff Spiegelman, editor of our journal, was awarded the W.J. Youden Award in Interlaboratory Testing for 1991 by the American Statistical Association for his paper “A Minimax Approach to Combining Means, with Practical Examples” which appeared in C~mon~etri~ and Intelligent Laboratory Systems, 5 (1989) 129-148. The Award, consisting of a citation and US$ 1000 split evenly among the authors, was presented at the Presidential Address Session during the An- nual Meeting of the American Statistical Association in Atlanta, Georgia, on August 20, 1991 in the Imperial Ballroom of the Marriott Hotel, where the Meet- ing was held. Congratulations! D.L. MASSART - m Software Reviews EQUIL Version 1.O This program allows calculation of a variety of equilibrium problems, including solubility, com- plexation, acidjbase titrations, and formation curves. A database of species, associated reactions, and thermodynamic equilibrium constants is included, along with a graphics utility. Equilibrium problems are solved rigorously, with inclusion of activity effects, with a slow but accurate combination of algorithms. Equilibrium relationships are solved - trans- parently to the user - using a combination of a recursive succes- sive approximation algorithm and a nonlinear equation solver. The program uses an ap- parently correct but slow method for solving equilibrium problems. A nswers given for all test cases appear to be correct. The program 01 ffers a useful means of calculat- ii lg solution pHs or species con- Cl entrations, without assumptions. C lnce the initial solution condi- ti ions are entered in the program, t1 he database is automatically s earthed for all pertinent equi- li .brium relationships. One limita- ti ion of the program appears to be ti hat the species distribution can- n .ot be plotted for the entire pH ri ange, as either acid or base ti- t1 rant can be specified, but it is ap- P ‘arently not possible to merge the tY wo results in a single plot. Addi- t1 ional chemical species and equi- Program: Manufacturer: Price: EQUIL, version 1 .O Micro Math Scientific Software, 2034 East Fort Union Boulevard, Salt Lake City, UT 84121-3144, U.S.A. US 199 librium relationships can be added to the database for particu- lar applications. The thermodynamic equilibrium constants are corrected for the appropriate ionic strength. The equation used to calculate activity coefficients is not given; however, ionic size in- formation is included in the database so presumably a form of the extended Debye-Htickel rela- tionship is used. In general, the program is easy to use through the use of a series of pop-up menus which give different op- tions for specifying solution condi- tions. Not all of the menu entries are clear upon initial inspection,

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n Pvlonitar

Monitor

197

m Award

Youden award for Cliff Spiegelman (and our journal)

Cliff Spiegelman, editor of our journal, was awarded the W.J. Youden Award in Interlaboratory Testing for 1991 by the American

Statistical Association for his paper “A Minimax Approach to Combining Means, with Practical Examples” which appeared in C~mon~etri~ and Intelligent Laboratory Systems, 5 (1989) 129-148. The Award, consisting of a citation and US$ 1000 split evenly among the authors, was presented at the Presidential

Address Session during the An- nual Meeting of the American Statistical Association in Atlanta, Georgia, on August 20, 1991 in the Imperial Ballroom of the Marriott Hotel, where the Meet- ing was held. Congratulations!

D.L. MASSART

m Software Reviews

EQUIL Version 1 .O

This program allows calculation of a variety of equilibrium problems, including solubility, com- plexation, acidjbase titrations, and formation curves. A database of species, associated reactions, and thermodynamic equilibrium constants is included, along with a graphics utility. Equilibrium problems are solved rigorously, with inclusion of activity effects, with a slow but accurate combination of algorithms. Equilibrium relationships are solved - trans- parently to the user - using a combination of a recursive succes- sive approximation algorithm and a nonlinear equation solver.

The program uses an ap- parently correct but slow method for solving equilibrium problems.

A nswers given for all test cases a ppear to be correct. The program 01 ffers a useful means of calculat- ii lg solution pHs or species con- Cl entrations, without assumptions. C lnce the initial solution condi- ti ions are entered in the program, t1 he database is automatically s earthed for all pertinent equi- li .brium relationships. One limita- ti ion of the program appears to be ti hat the species distribution can- n .ot be plotted for the entire pH ri ange, as either acid or base ti- t1 rant can be specified, but it is ap-

P ‘arently not possible to merge the tY wo results in a single plot. Addi- t1 ional chemical species and equi-

Program:

Manufacturer:

Price:

EQUIL, version 1 .O

Micro Math Scientific Software, 2034 East Fort Union Boulevard, Salt Lake City, UT 84121-3144, U.S.A.

US 199

librium relationships can be added to the database for particu- lar applications. The thermodynamic equilibrium constants are corrected for the appropriate ionic strength. The equation used to calculate activity coefficients is not given; however, ionic size in- formation is included in the database so presumably a form of the extended Debye-Htickel rela- tionship is used. In general, the program is easy to use through the use of a series of pop-up menus which give different op- tions for specifying solution condi- tions. Not all of the menu entries are clear upon initial inspection,