1 Quality Assurance in Environmental Trace Analysis -- 1. The Quality Assurance Program -- 2. Quality Control Procedures in the Quality Assurance Program -- 3. Operation of a Quality Assurance Program -- References -- 2 Applications of HPLC to the Analysis of Polycyclic Aromatic Hydrocarbons in Environmental Samples -- 1. Introduction -- 2. Nomenclature, Structure, and Carcinogenicity -- 3. Origin and Formation in the Environment -- 4. Methods of Analysis for Polycyclic Hydrocarbons -- 5. HPLC Applications in PAH Analysis -- 6. Conclusions -- References -- 3 HPLC of Pesticide Residues in Environmental Samples -- 1. Introduction -- 2. Instrumentation and Methodology -- 3. Applications -- 4. Conclusions -- References -- 4 HPLC Determination of Surfactants and Related Compounds -- 1. Anionic Surfactants and Related Compounds -- 2. Nonionic Surfactants -- 3. Cationic and Amphoteric Surfactants and Related Compounds -- References -- 5 Trace Metal Analysis by High Performance Liquid Chromatography -- 1. Introduction -- 2. HPLCโ{128}{148}Ultraviolet, โ{128}{148}Visible, and/or โ{128}{148}Fluorescence Detection of Metal Species -- 3. HPLCโ{128}{148}Mass Spectrometric Detection of Metal Species -- 4. HPLCโ{128}{148}Atomic Absorption Spectroscopic Detection of Metal Species -- 5. HPLCโ{128}{148}Atomic Fluorescence Spectroscopic Detection of Metal Species -- 6. HPLCโ{128}{148}Inductively Coupled or โ{128}{148}Direct-Current Plasma Emission Spectroscopic Detection of Metal Species -- 7. HPLCโ{128}{148}Electrochemical and โ{128}{148}Conductivity Detection of Metal Species -- 8. Ion Chromatographyโ{128}{148}Conductivity Detection of Metal Species -- 9. Conclusions -- References -- 6 Anion Analysis by Ion Chromatography -- 1. Introduction -- 2. Separation Modes -- 3. Detection Modes -- 4. New Applications in Anion Ion Chromatography -- 5. Summary -- References -- 7 HPLC Sample Injection and Column Switching -- 1. HPLC Sample Injection Using Valves -- 2. HPLC Column Switching -- References -- 8 High Performance Liquid Chromatography as a Cleanup Technique -- 1. Introduction -- 2. Cleanup for Gas Chromatography (GC) with Electron Capture (EC) or Flame Detection -- 3. Cleanup for GCโ{128}{148}Mass Spectrometry (MS) -- 4. HPLCโ{128}{148}HPLC -- 5. Cleanup for Radioimmunoassay (RIA) -- 6. Radioisotope Fractionation -- 7. Summary -- References