Quantitative Analysis of Extractable Inorganic Anions and Succinate in PCB Extract Water by Ion Chromatography

Introduction

Ionic cleanliness of electronic devices is of importance to the quality and durability of printed circuit board and assembly (PCBA) products. This is because ionic contamination may lead to electronic degradation and failure of PCBA by means of corrosions. Apart from major inorganic anions available in the environment such as chloride and bromide, weak organic anions (WOA) are also found on surface of PCBA due to their uses as activators in solder fluxes in manufacturing. The IPC-TM-650 standard method 2.3.28A lists seven inorganic anions and eight weak organic acids including succinate, and describes the sample extraction procedure using hot water bath at 80oC as well as analysis requirements such as detection of 50 ppb or better using ion chromatography (IC). In this application news, a high sensitivity IC method for quantification of seven inorganic anions and succinate in PCB extract water samples on HIC-20A ion chromatography with suppressed conductivity detector.

November 26, 2018 GMT