Evaluation of dual sample introduction systems by comparison of cyclonic spraychambers with different entrance angles for ICP-OES

摘要

The operating characteristics of a number of locally constructed inductively coupled plasma(ICP)dualsample introduction designs used for the determination of volatile and non volatile elements have been compared.Four cyclonic spray chamber arrangements with entrance angles of 0,45,90,and 180°weretested.The operating characteristics studied included instrumental conditions,chemical conditions for the hydride generation reaction and analytical figures of merit.Analytical performance of the nebulizationsystems was characterized by determination of the signal to background ratio(SBR),the limits of detection(LODs),and the precision(RSDs).In general,the results suggest that the dual system with 45°configurationwas found to be the best indicator of the analytical performance of the dual pneumatic nebulizer-cyclonicchamber arrangement studied, giving the best SBR, precision(1.0–3.5%)and in most cases the lowest detection limits(0.3–24.6 ng L1)for both,the hydride and non-hydride forming elements.Long-termreproducibility from the 45 degree-dual system was superior to those of different angles configuration (ranging from 4.2 to 5.1% for the non- and hydride forming elements respectively).The applicability of thedual system was proven by analyzing NIST 1573 Tomato Leaves with satisfactory results.