In order determine silica content in toothpaste ,dried toothpaste was fused by sodium peroxide and acidized by HCl,then silicon molybdenum yellow was reduced to silicon molybdenum blue by adding molybdenum blue color reagent, its absorbance value at 680 nm wavelength was determined. The precision of this method (RSD, n=12) is 0.88%, the recovery rate is 96.8%~103.7%. The test results of this method are stable and reliable.%牙膏经烘干后，经过氧化钠熔融，盐酸酸化后，在0.6~1.0 mol/L 酸性溶液中，加入钼蓝显色剂将硅钼黄还原成硅钼蓝，在波长680 nm 处测定其吸光值。用钼蓝分光光度法测定，方法精密度（RSD，n=12）为0.88%，回收率为96.8%~103.7%，方法稳定，测试结果可靠。
展开▼
