Iodine by Inductively Coupled Plasma – Mass Spectrometry (ICP-MS Testing)
Galbraith Laboratories provides iodine/iodide testing of water and solid samples. The details of the analysis are outlined below.
This method is capable of total iodide/iodine recovery, regardless of form: ionic or covalent.
Aqueous solutions may be dissolved in ammonium hydroxide solution. Solid samples are either dissolved in ammonium hydroxide solution or extracted into ammonium hydroxide (if insoluble).
Sample solutions are introduced into the instrument by way of a peristaltic pump. The solution is nebulized into an aerosol that is transported to a plasma torch. Iodine in the sample solution is subjected to intense heat in a radio-frequency inductively coupled argon plasma. The iodine ions are transported from the plasma through a vacuum interface into a quadrupole where they are separated on the basis of their mass to charge ratio (m/z). Iodine concentrations of unknown samples are determined by comparison to an external calibration of the instrument.
Instrument calibration is accomplished with iodide solutions. QC standards may be prepared from iodide solutions or iodohippuric acid.
Galbraith’s general method was written from nationally accepted methods, such as EPA SW846 6020. Click below to view a copy of the method summary:
Results are reported in ppm (wt/wt basis), using the mass of sample taken for the analysis.
Limit of Quantitation
The LOQ for water samples is approximately 1 ppb. Solid samples can routinely be measured below 1 ppm.
If you would like to receive more information on iodine/iodide by ICP-MS, or any of our analytical services, please contact us.