水玻斑中二氧化硅含量的测定,过去通常是采用重量法及氟硅酸钾容量法,也有用钠、硅酸碱连续滴定快速容量法。前两种方法操作烦赘,费时。快速法滴定终点不易掌握,准确度较差。现我们试用硅钼黄比色法测定水玻璃中硅含量,操作简便,快速。经和重量法对照,测定结果绝对误差在±0.4％以下。 Determination of water glass of silica content, the past is usually used gravimetric method and potassium fluosilicate capacity method, but also useful sodium, silicate continuous titration rapid capacity method. The first two methods are cumbersome and time-consuming. Fast titration end point is not easy to grasp, the accuracy is poor. Now we try silicon molybdenum yellow colorimetric determination of water glass silicon content, easy to operate, fast. After the comparison with the gravimetric method, the absolute error of the determination result is below ± 0.4%.