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本文应用正交函数—分光光度法在磺胺脒存在下直接测定磺胺二甲基嘧啶,在盐酸麻黄碱存在下直接测定盐酸苯海拉明。以0.1 N HCI为溶剂,选择波长范围242～302 nm,间隔12nm,求六点二次正交多项式的d_2系数值,消除磺胺脒的干扰,测定磺胺二甲基嘧啶。在0.1 N H_2SO_4溶液中,选择波长范围239～249 nm,间隔2 nm,求六点二次正交多项式的系数或选择波长范围240.5～255.5nm,间隔3 nm,求复合多项式的d_w(=2 d_2-d_3)系数值,均可消除盐酸麻黄碱的干扰。本方法简单,结果准确。在应用复合多项式法时,可以省略归一化因子,以简化计算。
In this paper, sulfamethazine was directly determined by orthogonal function-spectrophotometry in the presence of sulfamidine, and the direct determination of diphenhydramine hydrochloride was carried out in the presence of ephedrine hydrochloride. Using 0.1 N HCI as solvent, the d_2 values of the orthogonal polynomials of the 6 nd order were obtained by selecting the wavelength range of 242 ~ 302 nm and the interval of 12 nm, and the interference of sulfaguanidine was eliminated. The sulfamethazine was determined. In 0.1 N H 2 SO 4 solution, select the wavelength range of 239 ~ 249 nm, with an interval of 2 nm, and find the coefficients of the orthogonal polynomial of the order of six point or choose the wavelength range of 240.5 ~ 255.5 nm with an interval of 3 nm. Find the complex polynomial d_w (= 2 d_2-d_3) coefficient values, can eliminate the interference of ephedrine hydrochloride. The method is simple, the result is accurate. When applying the compound polynomial method, the normalization factor can be omitted to simplify the calculation.