建立了硅钼黄光度法测定沸石分子筛中硅的方法。在丙醇 -乙醇 - H2 O- HCl体系中 (p H1 .5) ,波长 40 0 nm处测定 ,硅量在 0～ 1 0 .0 μg·ml-1范围内呈良好线性关系。表观摩尔吸光系数ε4 0 0 nm=1 .83× 1 0 3L· mol-1·cm-1。方法已成功地用于沸石分子筛中硅含量测定 ,结果满意 A method for the determination of silicon in zeolite molecular sieve by silicon molybdenum yellow spectrophotometry was established. In propanol-ethanol-H2 O-HCl system (p H1 .5), at a wavelength of 40 0 ​​nm, the amount of silicon in the range of 0 ~ 100 μg · ml-1 showed a good linear relationship. The apparent molar absorptivity ε4 0 0 nm = 1.83 × 103L · mol-1 · cm-1. The method has been successfully applied to the determination of silicon in zeolite molecular sieve with satisfactory results