微波浓缩/离子色谱法测定印刷电路板表面的7种痕量无机阴离子

Simultaneous Determination of Seven Inorganic Anions on the Surface of Printed Circuit Board(PCB) by Ion Chromatography with Microwave Preconcentration

建立了印刷电路板上7种痕量无机阴离子(F-、NO2-、Cl-、Br-、NO3-、PO34-、SO24-)的微波浓缩/离子色谱测定方法。印刷电路板样品经纯水提取,微波浓缩后,在Ionpac AS23分析柱上,以4.5 mmol/LNa2 CO3+0.8 mmol/L NaHCO3为淋洗液,流速为1.0 mL/min。结果显示,F-、NO 2-、Cl-、Br-、NO 3-、PO34-、SO24-7种无机阴离子在23 min内完成检测,其线性范围分别为20～200、50～500、50～500、100～400、50～500、200～800、50～500μg/L,检出限(S/N=3)为0.5～2.4μg/L,回收率在86%～105%之间,相对标准偏差(RSD)均小于5%。该方法简便快速、灵敏度高、准确性好,可用于印刷电路板中7种无机阴离子的同时测定。

A method for the determination of seven trace inorganic anions （F-, NO2- , CI- , Br-, NO3- , POl-, SO42- ） on the surface of printed circuit board （ PCB ） was established by ion chroma- tography combing with microwave preconcentration. The PCB samples were extracted by water, and preconcentrated with microwave oven. The IC separation was carried out on Ionpac AS23 analytical column using 4. 5 mmol/L Na2CO3 - 0. 8 mmol/L NaHCO3 as mobile phase at constant flow rate of 1.0 mL/min. Under the optimal conditions, seven anions were successfully separated within 23 min. The calibration curves of F- , NO2- , Cl- , Br- , NO3- , PO]- , SO24- were linear in the ranges of 20-200, 50- 500, 50 - 500, 100 - 400, 50 - 500, 200 - 800, 50 - 500 ~g/L, respectively. Their detection limits（ S/N = 3 ） ranged from 0. 5 Ixg,/L to 2.4 ixg/L. The spiked recoveries were be- tween 86% and 105% with relative standard deviations （RSDs） less than 5.0%. The method was simple, rapid, sensitive and reliable, and was suitable for the simultaneous determination of seven anions on the PCB.