A multiple channel type concentric grid nebulizer (m-CGrid) was developed for realizing an efficient online standard addition in inductively coupled plasma optical emission spectrometer (ICP-OES) without pre-mixing of liquids before nebulization. The m-CGrid can nebulize two independent liquids without premixing due to a unique structure, having two independent liquid-flow capillaries inside a single nozzle and a grid screen (over 350 mesh per inch) being put on the hole of the nozzle. The grid acts as both a flow damper and sieve; two liquids are well-mixed with a gas flow in a small space just before the grid screen, and the mixture breaks-up into small droplets by passing through the grid. The m-CGrid nebulizer provides almost the same or better spray performance compared with a conventional nebulizer such as Meinhard nebulizer; the primary aerosols were much finer (D50: 2.9 m and 3.1 m for two channels) than those generated with Meinhard nebulizer type C (D50: 19.5 m). The signal intensities in ICP-OES obtained with two liquid channels were almost the same and were two-to four-fold higher than that obtained with the Meinhard nebulizer for 23 elements. The performances of m-CGrid in an online standard addition were demonstrated in the analysis of NIST SRM1577b bovine liver and NIES No.3 Chrorella. The analytical results were in good agreement with their certified values.
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