甲基红褪色法测定面制品中的溴酸钾

Color-Fading-Photometric Determination of Potassium Bromate in Wheat Flour Products with Methyl Red

本文考察了最佳的反应条件、光谱特征及方法的灵敏度与选择性，实验发现：溴酸钾在0．5～3μg·mL^-1浓度范围内遵守比尔定律，方法的灵敏度高，8为1．41×10^5L·mol^-1·cm^-1，并具有良好的选择性，对大多数离子的允许量都较大．用于实际样品的测定，结果令人满意．据此建立了一种新的测定面制品中溴酸钾含量的方法．

The spectral characteristics of the system and the optimum conditions for the reactions are investigated. The intensity of absorbance is directly proportional to the concentration of potassium bromate in the range of 0.5～3μg·mL^-1. The method has a high sensitivity, ε is1.41×10^5L·mol^-1·cm^-1. In this case, most metal and non-metal ions do not interfere, so that the method has a good selectivity. The method has been applied to the determination of potassium bromate in the wheat flour products, the result is satisfying. Therefore, a new method is developed to determine potassium bromate.