矿泉水中偏硅酸含量检测方法研究

Research of determination of H_2SiO_3 in mineral water

在硅钼蓝法测定矿泉水中偏硅酸含量中,钼酸铵难以用水溶解。实验对比了4种钼酸铵溶解方法：常温水、60~80℃水浴、沸水浴及氨水溶解,结果表明,10%氨水溶解效果最好,溶解度满足了实验要求。探讨了10%氨水溶解法下,1,2,4-氨基萘酚磺酸、抗坏血酸、硫酸亚铁铵和硼氢化钾做还原剂时,硅钼蓝法测定矿泉水中偏硅酸含量的可行性,结果表明,硫酸亚铁铵还原-硅钼蓝法相对较好,其精密度为0.015,加标回收率为99.33%。

The method of determining silicon is molybdenum blue method,ammonium molybdate is not dissolved in water.In the experiment,The article studied the ammonium molybdate＇s solubility in water of common temperaure,60~80 ℃ and 100 ℃ and ammonia water.The result has turned out that ammonia water is the best of the three,the concentration of ammonia water is 10%.When the experiment used the 10% ammonia water dissolve ammonium molybdate.The article studied 1-amino-2-naphtho1-4-sulfonic acid,Aascorbric acid.ammonium ferrous sulfate and potassium borohydride,which are four reducers,were used to determine H2SiO3 in mineral water.The result has turned out that that ammonium ferrous sulfate is better than the three,the precision is 0.015,the recoverie of spiked samples is 99.33%.