摘要
随着中国高端玻璃产业的发展和兴起,光学玻璃市场对硝酸钾中钠含量的要求越来越高,光学玻璃用硝酸钾中钠质量分数可低至10μg/g,对于如此低含量的钠,对测样条件的要求较高。使用原子吸收光谱法对标准加入法测光学玻璃用硝酸钾中钠(约10μg/g)的最佳测样条件进行了探索,考察了硝酸加入量、样品稀释倍数对测量结果准确性的影响,并对该方法的稳定性进行了考察。选用标准加入法,在加标量为零时钠质量浓度约为0.1μg/mL,标准物质系列各点钠质量浓度分别为0.0、0.1、0.2、0.3μg/mL,硝酸(1+1)加入量为2%(体积比)条件下,测量结果的精确度和稳定性均较好。该方法相对标准偏差为0.783 8%,测量相对误差为2.53%~4.94%,适用于钠质量分数约为10μg/g的硝酸钾检测。
As the development and uprising of high- tech glass industry,the optical glass market sets a much stricter standard on the content of sodium in potassium nitrate.The content of sodium in potassium nitrate can be as low a s 10 μ g/g for optical glass.For trace sodium of such low content in potassium nitrate,an extremely strict measurement conditions are needed.Using atomic absorption spectrophotometer,the proper measurement conditions for determining trace sodium （about 10 μ g/ g） in potassium nitrate for optical glass with standard addition method were tested.The influence of nitric acid amount and dilution ratio of potassium nitrate sample on testing result was investigated.Then the stability of this method was studied.By using standard addition method,when the mass concentration ofthe determining element sodium in potassium nitrate was diluted to about 0.1 μ g/mL,the HNO3（1＋1） added was around 2 % by volume and the series mass concentrations of reference materials added were 0,0.1,0.2,0.3 μ g/mL,respectively,a stable and reasonable result will be achieved.The RSD of this method was 0.783 8%,and the relative error ofthe testing result was between 2.53% and 4.94%.So it, s a suitable method to determine trace sodium（10 μg/ g） in potassium nitrate.
出处
《无机盐工业》
CAS
北大核心
2017年第9期67-69,72,共4页
Inorganic Chemicals Industry
基金
四川大学科技计划项目磷化工关键技术与产业化资助项目(SCU2015C002)
关键词
标准加入法
高纯硝酸钾
钠
光学玻璃
火焰原子吸收
standard addition method
high purity potassium nitrate
sodium
optical glass
flame atomic absorption spec-
