CANADIAN FOREST SERVICES PARTICIPATION IN CHECK SAMPLE PROGRAMS OVER A 25-YEAR PERIOD

To ensure that a laboratory produces credible analytical results, it i s important to participate in collaborative studies utilizing check sa mples as a method of implementing a quality control procedure. This pa per describes the following twelve check sample programs in which the Canadian Forest Service has participated during a 25-year period to en sure that it produces high quality analytical results: Acid Rain Direc t/Delayed Response Project, Alberta Institute of Pedology, AOAC INTERN ATIONAL, Canada Soil Survey Committee, Energy Resources Conservation B oard, Expert Committee on Soil Survey, International Soil-analytical E xchange, International Union of Forestry Research Organizations, Labor atory Exchange, Long Range Transport of Air Pollutants, Utah State Uni versity, and Western Enviro-Agricultural Laboratory Association.