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对于相互干扰的两组分析体系的分光光度法测定,已有许多方法.我们以解联立方程组结合标准曲线法或线性回归法测定二元体系,方法简便、结果准确,既可测定其中的单个组分,也可同时测定两组分.对复方新诺明制剂中磺胺甲(口恶)唑(SMZ)和甲氧苄氨嘧啶(TMP)测定的结果与标准方法一致.2 原理根据比耳定律和吸光度加和性原理,对于含组分1、2的二元体系,在波长i、j处,分别有A_i=E_(1i)C_1+E_(2i)C_2 (1),A_j=E_(1j)C_1+E_(2j)C_2 (2),(1)÷E_(2i)-(2)÷E_(2j)得A_i/E_(2i)-A_j/E_(2j)=(E_(1i)/E_(2i)-E_(1j)/E_(2j))C_1 或简记为A′_1=E′_1C_1(3).通过测定一组标准混合溶液,作A_1-C_1标准曲线或建立回归方程后可以测定C_1.在测C_1时,只需测定E_(2i)、E_(2j)而E_(1i)、E_(1j)不需测定,因它们包含在标准曲线的斜率或回归方程的回归系数中,减少了测定参数,有利于提高测定的准确度.同样的方法可以测定组分2.
There are many methods for the spectrophotometric determination of two sets of analytical systems that interfere with each other.We determine the binary system by solving simultaneous equations in combination with standard curve method or linear regression method and the method is simple and accurate and can be used to determine the Single component can also be measured at the same time the two components of the sulfamethoxazole (SMZ) and trimethoprim (TMP) in the determination of cotrimoxazole preparations with the standard method results are consistent with the principle of 2. Principle According to the ratio (1i) C_1 + E_ (2i) C_2 (1) and A_j = E_ (2i) for the binary systems containing components 1 and 2, respectively, (1j) C_1 + E_ (2j) C_2 (2), (1) ÷ E_ (2i) - (2) ÷ E_ (2j), we get A_i / E_ (2i) -A_j / E_ (2j) = ) / E_ (2i) -E_ (1j) / E_ (2j)) C_1 or abbreviated as A’_1 = E’_1C_1 (3) By measuring a set of standard mixed solution, making A_1-C_1 standard curve or establishing regression C_1 can be measured after the equation, and only E_ (2i), E_ (2j) and E_ (1i) and E_ (1j) need not be determined when measuring C_1 because they are included in the slope of the standard curve or regression of the regression equation Coefficients, reduced measurement parameters, help to improve the accuracy of determination. The same method can be measured component 2.