PREFACE Pesticide Analytical Manual Vol I and the most useful path for finding pertinent information within the volume. The user is urged to take advantage of these tools and to offer comments or improvements that would make them more useful. PAM I remains, as always,a loose-leaf volume, designed for continuing update The Editors acknowledge the continuing cooperation and support of the pesticide hemists in FDA District and Regional Laboratories, District Research Centers, and Division of Pesticides and Industrial Chemicals: those who contributed sub stantially to 3rd edition preparation are included as technical advisors on the title page. Many of these advisors drafted or reviewed individual sections of the 3rd edition, and all FDA chemists responded repeatedly to requests for information about the applications of analytical methodology for pesticide residues. The edi tors also acknowledge the preparation of specialized sections by Mark Wirtz(QA, QC and GLC Quantitation by Electronic Integration) and Ann Stack(Safety) numerous editorial reviews performed by Norma Yess, secretarial assistance pro- vided by Joan Duy, and comments on portions of the chapters on GLC and HPLC by Dr Colin Poole. Without the assistance of all these individuals, the 3rd edition would not have been possible, and we are grateful to them ecember Transmit aDa2 951(6/92)Pesticide Analytical Manual Vol. I viii Transmittal No. 94-1 (1/94) Form FDA 2905a (6/92) PREFACE and the most useful path for finding pertinent information within the volume. The user is urged to take advantage of these tools and to offer comments or improvements that would make them more useful. PAM I remains, as always, a loose-leaf volume, designed for continuing update. The Editors acknowledge the continuing cooperation and support of the pesticide chemists in FDA District and Regional Laboratories, District Research Centers, and Division of Pesticides and Industrial Chemicals; those who contributed sub￾stantially to 3rd edition preparation are included as technical advisors on the title page. Many of these advisors drafted or reviewed individual sections of the 3rd edition, and all FDA chemists responded repeatedly to requests for information about the applications of analytical methodology for pesticide residues. The edi￾tors also acknowledge the preparation of specialized sections by Mark Wirtz (QA/ QC and GLC Quantitation by Electronic Integration) and Ann Stack (Safety), numerous editorial reviews performed by Norma Yess, secretarial assistance pro￾vided by Joan Duy, and comments on portions of the chapters on GLC and HPLC by Dr. Colin Poole. Without the assistance of all these individuals, the 3rd edition would not have been possible, and we are grateful to them. December, 1993