Sun X, Lü B
Hua Xi Yi Ke Da Xue Xue Bao. 1990 Mar;21(1):111-3.
The determination of trace arsenic in soy and vinegar by oscillopolarography was investigated. A sensitive catalytic wave of arsenic appeared at -0.73V (vs. SCE) in 2mol/L H2SO4-0.2 mol/L KI-5 micrograms/ml Te systems. The linear relationship was 0-100ppb. The determination of arsenic in soy and vinegar was carried out after digestion with nitricperchloric acids. The detection limit was 1 ppb. The relative standard deviations were 4.7% and 8.8% respectively from the determinations of soy and vinegar. Recoveries were 92%-102% and 96%-110% respectively.
研究了示波极谱法测定酱油和食醋中痕量砷的方法。在2mol/L硫酸 - 0.2mol/L碘化钾 - 5微克/毫升碲体系中，砷在 - 0.73V（对饱和甘汞电极）处出现灵敏的催化波。线性关系为0 - 100ppb。用硝酸 - 高氯酸消化后测定酱油和食醋中的砷。检测限为1ppb。酱油和食醋测定的相对标准偏差分别为4.7%和8.8%。回收率分别为92% - 102%和96% - 110%。
