以二甲基二乙氧基硅烷与四乙氧基硅烷为有机—无机复合前驱体,番红花红为敏感指示剂,利用溶胶—凝胶法研制出有机改性传感膜。实验结果表明:在酸性条件下传感膜与亚硝酸根作用,导致吸光度降低,且在一定范围内与亚硝酸根浓度呈良好的线性关系(R=0.992 9),线性范围为0.001~0.1mg.L-1,检出限为3×10-4mg.L-1,响应时间小于1min。该传感膜具有选择性高、稳定性和重复性好的特点。 With dimethyl diethoxy silane and tetraethoxysilane as organic - inorganic composite precursor, saffron red as a sensitive indicator, the use of sol - gel method developed organic modified sensing membrane. The experimental results show that the sensitization of membrane and nitrite under acidic conditions leads to the decrease of absorbance, and it has a good linear relationship with the concentration of nitrite (R = 0.992 9) in a certain range. The linear range is from 0.001 to 0.1 mg .L-1, the detection limit of 3 × 10-4mg.L-1, the response time of less than 1min. The sensing film has the characteristics of high selectivity, good stability and repeatability.