Ernest Merian, International Association of Environmental Analytical Chemistry, Therwil, Switzerland. Roland W. Frei, Department of Analytical Chemistry, The Free University, Amsterdam, The Netherlands. J. F. Lawrence, Food Directorate, Health Protection Research, Ottawa, Ontario, Canada. Udo A. Th. Brinkman, Department of Analytical Chemistry, The Free University, Amsterdam, The Netherlands.

• Preface, Report from the Workshop, PART I TOXICOLOGICAL AND CHEMICAL ASPECTS The Importance of Chirality in Influencing both Acute and Delayed Neuropathic Toxicity of Organophosphorus Esters, Photoreduction of Parathion Ethyl, The Polymorphism of the Human Serum Paraoxonase, The Interethnic Differences of the Human Serum Paraoxonase Polymorphism Analysed by a Quantitative and a Qualitative Method, The Metabolites of Organophosphorus Pesticides in Urine as an Indicator of Occupational Exposure, A Test System for the Determining of the Fate of Pesticides in Surface Water: Protocol and Comparison of the Performance fpn Parathion of Ecocores and Micro Ecosystems from Two Sources, PART II ANALYTICAL ASPECTS Analytical Methodology for Organophosphorus Pesticides Used in Canada, Various Means for the Detection of Organophosphorus Compounds, Evaluation of Combined Flow Injection High Performance, Liquid Chromatography for the Determination of Three Organophosphorus Pesticides in Liquid Wastes, Mass Spectrometric Determination of Tris(l,3-dichloro-2- propyl)-phosphate (TDCP) Using NCI-Technique, The Application of a Flame Photometric Detector in Packed Microcapillary Liquid Chromatography: Detection of Organophosphates, Determination of Trialkyl and Triaryl Phosphates by Narrow- Bore Liquid Chromatography with On-Line Thermionic Detection, Gas Chromatography of Organophosphorus Compounds on Chiral Stationary Phases, Assay of the Chiral Organophosphate Soman, in Biological Samples.

Ernest Merian, International Association of Environmental Analytical Chemistry, Therwil, Switzerland. Roland W. Frei, Department of Analytical Chemistry, The Free University, Amsterdam, The Netherlands. J. F. Lawrence, Food Directorate, Health Protection Research, Ottawa, Ontario, Canada. Udo A. Th. Brinkman, Department of Analytical Chemistry, The Free University, Amsterdam, The Netherlands.

• Preface, Report from the Workshop, PART I TOXICOLOGICAL AND CHEMICAL ASPECTS The Importance of Chirality in Influencing both Acute and Delayed Neuropathic Toxicity of Organophosphorus Esters, Photoreduction of Parathion Ethyl, The Polymorphism of the Human Serum Paraoxonase, The Interethnic Differences of the Human Serum Paraoxonase Polymorphism Analysed by a Quantitative and a Qualitative Method, The Metabolites of Organophosphorus Pesticides in Urine as an Indicator of Occupational Exposure, A Test System for the Determining of the Fate of Pesticides in Surface Water: Protocol and Comparison of the Performance fpn Parathion of Ecocores and Micro Ecosystems from Two Sources, PART II ANALYTICAL ASPECTS Analytical Methodology for Organophosphorus Pesticides Used in Canada, Various Means for the Detection of Organophosphorus Compounds, Evaluation of Combined Flow Injection High Performance, Liquid Chromatography for the Determination of Three Organophosphorus Pesticides in Liquid Wastes, Mass Spectrometric Determination of Tris(l,3-dichloro-2- propyl)-phosphate (TDCP) Using NCI-Technique, The Application of a Flame Photometric Detector in Packed Microcapillary Liquid Chromatography: Detection of Organophosphates, Determination of Trialkyl and Triaryl Phosphates by Narrow- Bore Liquid Chromatography with On-Line Thermionic Detection, Gas Chromatography of Organophosphorus Compounds on Chiral Stationary Phases, Assay of the Chiral Organophosphate Soman, in Biological Samples.

Ernest Merian, International Association of Environmental Analytical Chemistry, Therwil, Switzerland. Roland W. Frei, Department of Analytical Chemistry, The Free University, Amsterdam, The Netherlands. J. F. Lawrence, Food Directorate, Health Protection Research, Ottawa, Ontario, Canada. Udo A. Th. Brinkman, Department of Analytical Chemistry, The Free University, Amsterdam, The Netherlands.

• Preface, Report from the Workshop, PART I TOXICOLOGICAL AND CHEMICAL ASPECTS The Importance of Chirality in Influencing both Acute and Delayed Neuropathic Toxicity of Organophosphorus Esters, Photoreduction of Parathion Ethyl, The Polymorphism of the Human Serum Paraoxonase, The Interethnic Differences of the Human Serum Paraoxonase Polymorphism Analysed by a Quantitative and a Qualitative Method, The Metabolites of Organophosphorus Pesticides in Urine as an Indicator of Occupational Exposure, A Test System for the Determining of the Fate of Pesticides in Surface Water: Protocol and Comparison of the Performance fpn Parathion of Ecocores and Micro Ecosystems from Two Sources, PART II ANALYTICAL ASPECTS Analytical Methodology for Organophosphorus Pesticides Used in Canada, Various Means for the Detection of Organophosphorus Compounds, Evaluation of Combined Flow Injection High Performance, Liquid Chromatography for the Determination of Three Organophosphorus Pesticides in Liquid Wastes, Mass Spectrometric Determination of Tris(l,3-dichloro-2- propyl)-phosphate (TDCP) Using NCI-Technique, The Application of a Flame Photometric Detector in Packed Microcapillary Liquid Chromatography: Detection of Organophosphates, Determination of Trialkyl and Triaryl Phosphates by Narrow- Bore Liquid Chromatography with On-Line Thermionic Detection, Gas Chromatography of Organophosphorus Compounds on Chiral Stationary Phases, Assay of the Chiral Organophosphate Soman, in Biological Samples.