Selective Detection of Selenium in Water Utilizing Chemical Reaction Interface Mass Spectrometry†

✍ Scribed by Moini, Mehdi; Li, Guoqiang; Perez, Freserico; Ibarra, Flor E.; Sandoval, Dieg

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 296 KB
• Volume: 32
• Category: Article
• ISSN: 1076-5174
• DOI: 10.1002/(sici)1096-9888(199704)32:4<420::aid-jms495>3.0.co;2-n

✦ Synopsis

Gas chromatography/chemical reaction interface mass spectrometry (GC/CRIMS) is shown to be a successful selective method for the detection of selenium-containing compounds. Two reaction gases, sulfur dioxide and (SO 2 ) hydrogen chloride (HCl), were examined in order to optimize selectivity and sensitivity. A high degree of selectivity was obtained with as a reaction gas ; however, the detection limit of at m/z 128 (the most sensitive SO 2 80SeO 3 ' ion for the plasma) was only 3 ng ll-1. HCl gas, which had been shown to be a good reaction gas SO 2 -containing for sulfur-containing compounds, was also shown to be an excellent reaction gas for selenium-containing compounds. In the HCl-containing plasma, 80SeCl' at m/z 115 was the most sensitive and selective ion for the detection of selenium-containing compounds. Selectivity was demonstrated by using mixtures of selenium-containing and non-selenium-containing compounds. The utility of GC/CRIMS as a method for the selective detection of seleniumcontaining compounds was demonstrated with a variety of selenium complexes that were formed by the addition of selective selenium complexing agents to selenium-containing water. The detection limit of selenium in water was ¿62 pg and the linear dynamic range spanned at least two orders of magnitude (620 pg ll-1-308 ng ll-1).