在光电比色法中 ,为了测定水中微量钍提高方法的准确性和灵敏度 ,国内许多资料有过报导 ,主要有 :显色剂的选择及用量、显色反应条件、溶液的颜色、溶液颜色的稳定时间等。经多年实验发现 ,除了上述主要几个方面外 ,同型号仪器不同的吸收波长同样影响光电比色法的准确性和灵敏 In the photoelectric colorimetric method, in order to determine the accuracy and sensitivity of the method for increasing the amount of thorium in water, many domestic data have been reported, including: the choice and amount of the color reagent, the color reaction conditions, the color of the solution, the color of the solution Stable time and so on. After years of experiments found that, in addition to the above several aspects, the same type of instrument also affects the absorption wavelength of the same colorimetric accuracy and sensitivity