电感耦合等离子体质谱仪双样品环进样系统的设计

电感耦合等离子体质谱仪（ICP-MS）常搭配溶液气动雾化器进样系统，以串联方式测样，其进样效率并未达到最佳。本文基于六通多路阀设计了一种双样品环进样系统，连接雾化器前，用以提高仪器的测样效率。实验测定了Sc、Ti、V、Cr、Mn、As、Co、Ni、Cu、Pb、Zn、Cd、Li、Sr、Ba、Co、U、Th共18种元素，其校准曲线的线性相关系数均大于0.999，精密度（n=5）均小于5%。实验还分别测定了1、6、12、18、32种元素，测样时间分别节约了45%、35%、27%、21%、16%。以Ce元素为例，先测试100.00 μg/L样品后，立即测试1.00 μg/L样品，未发现明显的记忆效应。该系统价格低廉、操作简单、体积小、易于实现自动化，且有与其他仪器联用的可能性，具有广阔的发展前景。

Design of Double Sampling Loops System of Inductively Coupled Plasma Mass Spectrometry

Inductively coupled plasma mass spectrometry (ICP-MS) is usually coupled with solution pneumatic nebulizer sampling system, whose detection efficiency is low when measured in series mode. Based on the double-layer six-way multi-way valve, a double sample ring sampling system was designed, which could improve the detection efficiency by changing the connection mode of the sampling system. This system connected with pneumatic nebulizer, one loop was loading sample, the other loop was detecting. The detection time was saved by two-way parallel mode. Determination of different numbers of elements needed different length loop. The correlation coefficients of calibration curves of Sc, Ti, V, Cr, Mn, As, Co, Ni, Cu, Pb, Zn, Cd, Li, Sr, Ba, Co, U, and Th are greater than 0.999, and the precisions (n=5) are less than 5%. 1, 6, 12, 18, and 32 elements were determinted, their detection time was saved 45%, 35%, 27%, 21%, 16%, respectively. The number of elements is fewer, the improvement of the efficiency is higher. Compared with standard method, the limits of detection and sensitivity of this system have no significant difference. The double sampling loops system has no significant memory effect. The two-layer six-way multi-way valve switched manually and owned automation prospect. This system is high efficient, fast and simple, easy to realize automation, and more possibilities to use with other instruments.