Characterization of a Second-Generation Focal-Plane Camera Coupled to an Inductively Coupled Plasma Mattauch−Herzog Geometry Mass Spectrograph

• Published in: Analytical chemistry (Washington) 2006-07, Vol.78 (13), p.4319-4325
• Main Authors: Schilling, Gregory D, Andrade, Francisco J, Barnes, Sperline, Roger P, Denton, M. Bonner, Barinaga, Charles J, Koppenaal, David W, Hieftje, Gary M
• Format: Article
• Language: English
• Subjects: Analytical chemistry; Cameras; Chemistry; Exact sciences and technology; Frequencies; Isotopes; Metals; Ratios; Scientific imaging; Spectrometric and optical methods; Spectrum analysis
• ISSN: 0003-2700; 1520-6882
• DOI: 10.1021/ac052026k

A second-generation Faraday-strip array detector has been coupled to an inductively coupled plasma Mattauch−Herzog geometry mass spectrograph, thereby offering simultaneous acquisition of a range of mass-to-charge ratios. The second-generation device incorporates narrower, more closely spaced collectors than the earlier system. Furthermore, the new camera can acquire signal on all collectors at a frequency greater than 2 kHz and has the ability to independently adjust the gain level of each collector. Each collector can also be reset independently. With these improvements, limits of detection in the hundreds of picograms per liter for metals in solution have been obtained. Some additional features, such as a broader linear dynamic range (over 7 orders of magnitude), greater resolving power (up to 600), and improved isotope ratio accuracy were attained. In addition, isotope ratio precision as low as 0.018% RSD was achieved.