Objectives For developing the determination method of Hg in Zhacai soy sauce by HG-AFS.Methods:Samples are immerged at ambiert temperature through night in Nitrate and digested at 130℃for two hours,analyed by atomic fluorescence.Results:operation conditions such as KaBH4 concentration,interference of metal ions which affected the determination have been optimized.The detection limits are 0.0375μg/L for Hg under the best conditions.Mercury's recovery ratios of digestion methods is 95-115%;Conclusions:The det...