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International Conference on Metrology of Environmental, Food and Nutritional Measurements 9 – 12 September 2008, Budapest, Hungary DEVELOPMENT OF REFERENCE MATERIAL FOR ORGANOCHLORINE PESTICIDES IN HERBAL SAMPLE Yiu-chung Wong1, Tat-ting Kam2, Serena Chan3 1 Analytical & Advisory Services Division, Government Laboratory, Hong Kong, [email protected] 2 Analytical & A