This complete laboratory reference manual explains the principles behind solid phase extraction (SPE) and provides readily reproducible prools for solving extraction problems in forensic and clinical chemistry. Numerous actual chromatograms, based on original research and diverse applications, demonstrate the technique and the results that can be achieved. Extensive appendices allow fast access to frequently needed information on reagents, the preparation of solutions and buffers, milliequivalent and millimode calculations, buffers and pKa for SPE, and a complete RapidTrace® technical manual. Each proven prool is described in step-by-step detail and contains an introduction outlining the principle behind the technique, lists of equipment and reagents, and tips on troubleshooting and on avoiding known pitfalls.