ISSN 1040-8347 Letter from the Editor Prof. C. H. Lochmüller page 281 Electrochemical Analysis of Some Toxic Metals by Ion–Selective Electrodes Vinod K. Gupta, M. R. Ganjali, P. Norouzi, H. Khani, Arunima Nayak & Shilpi Agarwal pages 282-313 The Progress in Electron Microscopy Studies of Particulate Matters to Be Used as a Standard Monitoring Method for Air Dust Pollution Przemysław Sielicki, He..