在电感耦合等离子体原子发射光谱法(ICP-AES)中,为了提高溶液样品的雾化效率,增强光源辐射强度,降低光谱分析检出限,实验研究了磁化水技术在水溶液前处理中的应用.结果表明,水溶液的物理性质随着磁感应强度改变有着明显变化,在磁感应强度为280 mT时,溶液的表面张力和粘度最小.随着磁化时间的延长,光源中各元素的发射光谱强度也有不同的响应,当水溶液被磁化10 min时,多数元素的发射谱线强度最大.为了了解光谱增强的机理,通过测量铁元素的一组谱线强度,用斜率法求得等离子体的激发温度;测量氩元素的一条谱线,用Stark变宽法求得电子密度.实验证明,样品溶液经过磁化以后引入ICP光源是降低分析检出限的一种有效方法.%In inductively coupled plasma atomic emission spectrometry (ICP-AES) , the magnetic treatment technique of water was used in the pretreatment of aqueous solution to improve the nebulization efficiency of sample, enhance the radiation intensity of light source and reduce the detection limit of spectral analysis. The results showed that the physical property of aqueous solution had significant change with the change of magnetic induction density. When the magnetic induction density was 280 mT, the surface tension and viscosity of solution were the lowest. With the prolonging of magnetizing time, the emission spectral intensity of elements in light source had different responses. When the aqueous solution was magnetized for 10 min, the emission spectral intensity of most elements was the highest. In order to understand the spectrum enhancing mechanism, one group of spectral intensity of iron was measured, and excitation temperature of plasma was obtained by slope method. One spectral line of argon was measured, and the electron density was obtained by Stark broadening method. The experiment indicated that the introduction of sample solution after magnetic treatment was an effective way to reduce the analytical detection limit.
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