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ULTRASONIC NEBULIZATION AND ARSENIC VALENCE STATE CONSIDERATIONS PRIOR TO DETERMINATION VIA INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY
Creed, J., T. Martin, AND C. Schwegel. ULTRASONIC NEBULIZATION AND ARSENIC VALENCE STATE CONSIDERATIONS PRIOR TO DETERMINATION VIA INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY. Journal of Analytical Atomic Spectrometry 10(6):443-447, (1995).
An ultrasonic nebulizer (USN) was utilized as a sample introduction device for an inductively coupled plasma mass spectrometer in an attempt to increase the sensitivity for As. The USN produced a valence state response difference for As. The As response was suppressed approximately 20% relative to an As standard. This valence state response difference produced by the USN was investigated by collecting aerosol fractions and analysing these factions by ion chromatography-ICP-MS. The analysis of these fractions indicated that As could be oxidized to As as the aerosol traverses the USN. The fraction collected from the condenser drain of the USN was found to contain a disproportionate amount of As. The pre-nebulization oxidation of As to As via digestion, treatment with H2O2, and treatment with sodium hypochlorite were all investigated in terms of removing the valence state response difference of As. The treatment with 1 mg 1 sodium hypochlorite was found to eliminate the valence state response difference for As without the need for digestion.