Development of a new method for sulfide determination by vapor generator-inductively coupled plasma-mass spectrometry

作者：Colon Mireia; Iglesias Monica^*; Hidalgo Manuela

来源：Spectrochimica Acta Part B: Atomic Spectroscopy , 2007, 62(5): 470-475.

DOI：10.1016/j.sab.2007.04.004

• sulfide
• inductively coupled plasma mass spectrometry
• vapor generator
• octopole reaction cell

A new sensitive methodology for the determination of total reduced sulfur species in natural waters and acid volatile sulfides in sediments at low levels (mu g L-1) is described. Reduced sulfur species were separated from the water matrix in the form of H2S after reaction with hydrochloric acid in a commercial vapor generator coupled to an inductively coupled plasma quadrupole mass spectrometer (VG-ICP-QMS) equipped with a reaction cell. The method avoided the effect of polyatomic isobaric interferences at m/z 32 caused by (OO)-O-16-O-16 and (NO+)-N-14-O-18 through the elimination of the aqueous matrix, a source of oxygen. By introducing a mixture of helium and hydrogen gases into the octopole reaction cell, a series of ion-molecule reactions were induced to reduce the interfering polyatomic species. Operating conditions of the octopole reaction cell system and the analyzer were optimized to get the best signal to background ratio for S-32; a full factorial 2(3) experimental design was developed in order to evaluate which variables had a significant effect and a simplex methodology was applied to find the optimum conditions for the variables. The new method was evaluated by comparison to the standard potentiometric method. The analytical methodology developed was applied to the analysis of reduced sulfur species in natural waters and acid volatile sulfides in sea sediments.

• 出版日期2007-5