电感耦合等离子体原子发射光谱(ICP-AES)法测定水-乙二醇型难燃液压液中Ca、Mg、Zn元素含量

通过基体匹配法消除光谱干扰,采取降低雾化气流量、提高冷却器流量和降低蠕动泵泵速以减少进样量的措施直接进样,建立了电感耦合等离子体原子发射光谱(ICP-AES)法测定水-乙二醇型难燃液压液中Ca、Mg、Zn添加剂元素含量的分析方法。实验结果表明:所测各元素的相对标准偏差均小于5%,线性相关系数大于0.999,加标回收率在97%～105%,方法的检出限均小于0.15mg/L。方法无需对样品进行预处理,直接进样检测,具有分析速度快、操作简单、测定结果可靠等特点,可以实现水-乙二醇型难燃液压液中Ca、Mg、Zn元素的含量分析。

Determination of Ca, Mg and Zn in Water-glycol Fire-resistant Hydraulic Fluid by ICP-AES

A new method for the determination of Ca, Mg and Zn in water-glycol fire resistant hydraulic fluid was established by ICP-AES. The spectral interferences were eliminated by matrix matching method and the sampling volume was reduced, which leading to direct sampling owing to decreasing the atomization gas flow, improving the cooler flow and reducing the peristaltic pump speed. The results showed that the relative standard deviation (RSD) of each determined element was less than 5%, the linear correlation coefficient was over 0.999, and the detection limits were less than 0.15 mg/L with 97%~105% recovery. The method has quick analytical speed, easy operation and reliable analytical results without sample pre-treatment. It is suitable for the determination of the contents of Ca, Mg and Zn in water-glycol fire resistant hydraulic fluid.