Improved determination of iodine by sequential (photo)chemical vapor generation and pneumatic nebulization in the programmable temperature spray chamber and inductively coupled plasma optical emission spectrometry

With both CVG and PCVG-PN-PTSC, the slopes of analytical working graphs of ICP-OES are improved by over an order of magnitude for iodine compared to those with a conventional pneumatic nebulization. Generally, for determination of iodine, the technique exhibits a linear dynamic range of 3 orders of magnitude. For iodine, LODs of 11 ng mL− 1 were achieved in CVG mode and 17 ng mL− 1 in PCVG mode at 206.15 nm. The technique also gave good short-term stabilities below 2% RSD for both modes. Finally, a continuous CVG technique using sodium nitrite exhibits a better analytical performance than the PCVG mode. Quantitative determination of iodide in mineral water is preferentially carried out by the standard addition procedure. The proposed methodologies were validated with determining of trace iodide in simulated seawater in 2% nitric acid standard reference material CRM-SW, giving rise to satisfactory results.