Direct Measurement of Silver Anoparticles Suspended in Aqueous Solution by Liquid Electrode Plasma - Atomic Emission Spectrometry

Abstract

This paper presents a quantitative measurement of silver nanoparticles in aqueous suspension by liquid electrode plasma atomic emission spectrometry (LEP-AES). The dependence of the LEP-AES signal intensity on voltage-pulse height and duration is investigated. The detection limit and coefficient of variation (CV) are also measured. The CV attains a minimum value of 7% for a pulse height of 1080 V and a pulse duration of 7 ms. The detection limit (3σ) of silver nanoparticles by LEP-AES, under these optimal conditions, was calculated from a calibration curve to be 0.23 µg/g.