With typical Organicphosphorus pesticides (OPPs) as the objects of research, and Laizhou Bay and Jiaozhou Bay as the main study areas, results from a detailed study on the contents and distribution of OPPs in seawater samples collected from the study areas are discussed in this paper. Modern instrumental analytical techniques have been utilized, and rapid but sensitive analytical methods have been developed for the quantitative determination of trace OPPs in seawater and offshore sediment. A stu...