1. Reference materials for PCB analysis: Production and certification of ten polychlorinated biphenyls in an iso-octane reference solution

   • T. Rymen
   • S. Clark
   • A. S. Lindsey

   Original Papers Pages: 553 - 560

2. A neural network approach to qualitative analysis in inductively coupled plasma-atomic emission spectroscopy (ICP-AES)

   • C. Schierle
   • M. Otto
   • W. Wegscheider

   Original Papers Pages: 561 - 565

3. Design and characterization of flow-through coulometric cells with porous working electrodes made of crushed vitreous carbon

   • E. Beinrohr
   • M. Németh
   • G. Tölg

   Original Papers Pages: 566 - 575

4. High-performance ligand-exchange liquid chromatography (HPLEC) of aromatic amines with copper(II), nickel(II) and zinc(II) loaded chelating silica gel columns

   • U. Pyell
   • G. Stork

   Original Papers Pages: 576 - 581

5. Analysis of organic contaminations on Si(100) by thermal desorption spectroscopy

   • U. Göbel
   • M. Wesemann
   • R. Schlögl

   Original Papers Pages: 582 - 592

6. Study of corrosion on copper strips by mixtures of mercaptans, sulphides and disulphides with elemental sulphur in the ASTM D-130 test by means of electron microscopy (SEM) and energy dispersive X-ray (EDX)

   • J. Monzó
   • J. García-Antón
   • J. L. Guiñón

   Original Papers Pages: 593 - 596

7. Speciation of Sb(III) and Sb(V) by pH-control using three inorganic acids (hydrochloric, phosphoric and sulphuric)

   • María Beatriz de la Calle-Guntiñas
   • Yolanda Madrid
   • Carmen Cámara

   Original Papers Pages: 597 - 599

8. Determination of trace amounts of molybdenum in water samples by inductively coupled plasma atomic emission spectrometry after cobalt-dithiocarbamate coprecipitation

   • Jiang Zucheng
   • P. Schramel

   Original Papers Pages: 600 - 603

9. Contributions to the ethyl acetate application in residue analysis

   • H. Steinwandter

   Original Papers Pages: 604 - 606

10. A new approach to experimental data evaluation from tree ring analysis

    • M. Ferretti
    • R. Udisti
    • E. Barbolani

    Original Papers Pages: 607 - 611

11. Spectrophotometric determination of kelthane using a new reagent system

    • P. Shivhare
    • V. K. Gupta

    Short Communications Pages: 612 - 612

12. Flotation-spectrophotometric determination of traces of phosphorus in iron, nickel, cobalt, copper and zinc using molybdate and malachite green

    • Ming Chen

    Short Communications Pages: 613 - 614

13. Simultaneous separation of tin and bismuth from water and sea water by flotation with thionalide

    • Susumu Nakashima

    Short Communications Pages: 614 - 615

14. Research in environmental pollution

    • H. Steinwandter

    Short Communications Pages: 615 - 616