Study on Some Problems of Mercury in Milk Powder by Cold Atomic-Unchromatic Dispersion Atomic Fluorescence Spectrophotometry
Feng Jiali;Pan Zhenqiu; Liu Hongwang (Hunan Provincial Sanitary and Anti-epidemic Station, Changsha 410005)
A theory about reduction reaction of mercury by cold atomic-unchromatic disper sion atomic fluorescence spectrophotometry is proposed. After a sample containing mercury has been digested with nitric acid. the mercury reacts with a nitrogen oxide (NxOy ) come from products of digestion to form a Hg (NxOy ), complex compound. Added tin protochloride liquor (SnCl2 ). the complex compound is decomposed, and Hg2+ is reducted to Hg0 and NxOy is released. both are carried out liquor to detector by N2, so the sensitivity is raised 1. 5 times. The application of this method has been confirmed by Joint UNEP/FAO/WHO food contamination monitoring programme for analytical quality assurance-milk powder test mate rial for lead, cadmium and mercury analysis: study Ⅷ(1994).