1. On-line chromatographic pretreatment of samples with varying salt concentrations for capillary electrophoresis

   • J. R. Veraart
   • C. Gooijer
   • U. A. Th. Brinkman

   Originals Pages: 581 - 588

2. Influence of mobile phase conditions on the clean-up effect of restricted-access media precolumns for plasma samples injected in a column-switching system

   • Z. Yu
   • D. Westerlund

   Originals Pages: 589 - 594

3. Solid phase extraction of polychlorinated biphenyls from water containing humic substances

   • P. Bonifazi
   • E. Pierini
   • F. Bruner

   Originals Pages: 595 - 600

4. GC determination of volatile components in human exhalation and in ambient atmosphere, after preconcentration on solid sorbents

   • T. Qin
   • X. B. Xu
   • K. Stulik

   Originals Pages: 601 - 604

5. HPLC analysis of fat-soluble vitamins on standard and narrow bore columns with UV, electrochemical and particle beam MS detection

   • R. Andreoli
   • M. Careri
   • M. Musci

   Originals Pages: 605 - 612

6. Molecular shape recognition of polycyclic aromatic hydrocarbons with various alkyl diphenyl bonded phases in microcolumn liquid chromatography

   • K. Jinno
   • C. Okumura
   • Y. -L. Chen

   Originals Pages: 613 - 618

7. HPLC analysis of boldine in pharmaceuticals

   • D. De Orsi
   • L. Gagliardi
   • D. Tonelli

   Originals Pages: 619 - 622

8. Selective chiral determination of aspartic and glutamic acid in biological samples by capillary electrophoresis

   • A. Tivesten
   • A. Lundqvist
   • S. Folestad

   Originals Pages: 623 - 633

9. An exprimental design approach to selecting the optimum liquid chromatographic conditions for the determination of vitamins B₁, B₂-phosphate, B₃, B₆ and C in effervescent tablets containing saccharin and sunset yellow FCF

   • C. Nsengiyumva
   • J. O. De Beer
   • F. Parmentier

   Originals Pages: 634 - 644

10. Determination of sorbic acid in wines with a hydrogen sulfonated divinyl benzene-styrene copolymer HPLC column

    • A. Amati
    • M. Castellari
    • G. Arfelli

    Short Communication Pages: 645 - 648

11. Chromatographic mobility of some metals on paper impregnated with lignin

    • N. Brajenović
    • S. Kveder
    • O. Hadžija

    Short Communication Pages: 649 - 650

12. M. S. Tswett's correspondence with John Briquet II. Letters from St. Petersburg (1896–1898)

    • I. M. Hais
    • M. Niang
    • L. S. Ettre

    Historical Papers Pages: 651 - 662

13. M. S. Tswett's correspondence with John Briquet III. The two late letters (1915–1917)

    • I. M. Hais
    • M. Niang
    • L. S. Ettre

    Historical Papers Pages: 663 - 667

14. Calendar of events

    Events Pages: 668 - 670

15. New products

    Announcement Pages: 670 - 672