Graphic Abstracts Collect. Czech. Chem. Commun. 2010, 75, 721–730 Use of a Membraneless Extraction Module for the Voltammetric Determination of Total Sulfites in Wine Luís Moreira Gonçalves, Miriam Franco da Anunciação, Inês Maria Valente, João Grosso Pacheco, José António Rodrigues and Aquiles Araújo Barros Collect. Czech. Chem. Commun. 2010, 75, 731–741 Polarographic Determination of Vitamin C After Derivatization with o-Phenylenediamine José A. Rodrigues, Inês M. Valente, Luís M. Gonçalves, João G. Pacheco and Aquiles A. Barros Collect. Czech. Chem. Commun. 2010, 75, 743–756 9-Borafluorenes – NMR Spectroscopy and DFT Calculations. Molecular Structure of 1,2-(2,2′-Diphenylylene)-1,2-diethyldiborane Bernd Wrackmeyer, Peter Thoma, Rhett Kempe and Germund Glatz Collect. Czech. Chem. Commun. 2010, 75, 757–766 The Preparation of 3H-Labeled Acyclic Nucleoside Phosphonates and Study of Their Stability Tomáš Elbert, Petra Břehová and Antonín Holý Collect. Czech. Chem. Commun. 2010, Vol. 75, No. 7, pp. i i