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本文用线性扫描吸附伏安法,研究了在NH_4OH-NH_4Cl底液中,人工合成食用色素柠檬黄,亮蓝在悬汞电极上有较强的吸附性。当pH～8.7柠檬黄在-0.67V处,导数峰电流与浓度在0.002～0.30μg·ml~(-1)范围内成良好线性关系。pH～8.0在-1.30V处产生亮蓝吸附还原峰,导数峰与浓度在0.02～1.5μg·ml~(-1)范围内成线性关系。用此法可不经分离,直接测定食品中的混合色素。柠檬黄 [NaO_3SC_6H_4N_2C_3N_2(COONa)(C_6H_4SO_3Na)] 亮蓝 [~-O_3SC_6H_4C(:C_6H_4:N~+C_2H_5CH_2C_6H_4SO_3Na) (C_6H_4NC_2H_5CH_2C_6H_4SO_3Na)]为人工合成食用色素,其原料为煤焦油产物苯胺,具有一定毒性,我国卫生部规定这些人工合成色素的最
In this paper, the linear sweep adsorption voltammetry was studied in the NH_4OH-NH_4Cl bottom solution, the synthetic food color lemon yellow, bright blue on the hanging mercury electrode has strong adsorption. When the pH ~ 8.7 lemon yellow at -0.67V, the derivative peak current and concentration in the range of 0.002 ~ 0.30μg · ml ~ (-1) of a good linear relationship. At pH ~ 8.0, a bright blue adsorption reduction peak was observed at -1.30V. The derivative peak was linear with the concentration in the range of 0.02 ~ 1.5μg · ml ~ (-1). With this method without separation, direct determination of mixed colors in food. Lemongrass is a kind of synthetic food coloring material, its raw material is aniline of coal tar product, has a certain toxicity, and our country’s health Ministry stipulates the most of these synthetic pigments