The report describes activities undertaken toward the development of methods suitable for optimization and control of the wet limestone and dolomite scrubbing processes by continuous onstream analytical methods. Emphasis was placed on development of continuous on-line methods for slurry sampling and separation that do not disturb the chemical steady state condition. Establishment of sampling requirements and an effective means for total phase separation in a period less than thirty seconds were accomplished. Analytical instrumental methods for characterization of the separated solid matter and liquor, continuous X-ray analyses of solid constituents for sulfur, calcium, magnesium and iron contents, instrumental analysis of acidity, sulfite, sulfate, calcium, magnesium and carbonate contents, and rapid analysis of sulfite were developed. Approaches for total complete on-line analysis of other wet limestone scrubber constituents have been identified. (Modified author abstract)