当代化工
噹代化工
당대화공
Contemporary Chemical Industry
2015年
10期
2509-2510
,共2页
光度法%牙膏%二氧化硅
光度法%牙膏%二氧化硅
광도법%아고%이양화규
Spectrophotometry%Toothpaste%Silicon dioxide
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。
牙膏經烘榦後，經過氧化鈉鎔融，鹽痠痠化後，在0.6~1.0 mol/L 痠性溶液中，加入鉬藍顯色劑將硅鉬黃還原成硅鉬藍，在波長680 nm 處測定其吸光值。用鉬藍分光光度法測定，方法精密度（RSD，n=12）為0.88%，迴收率為96.8%~103.7%，方法穩定，測試結果可靠。
아고경홍간후，경과양화납용융，염산산화후，재0.6~1.0 mol/L 산성용액중，가입목람현색제장규목황환원성규목람，재파장680 nm 처측정기흡광치。용목람분광광도법측정，방법정밀도（RSD，n=12）위0.88%，회수솔위96.8%~103.7%，방법은정，측시결과가고。
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.
