Journal
ANALYTICA CHIMICA ACTA
Volume 573, Issue -, Pages 399-405Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2006.04.078
Keywords
multisyringe flow injection analysis (MSFIA); mercury; cold-vapor; atomic absorption
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A new software-controlled time-based multisyringe flow injection system for mercury determination by cold-vapor atomic absorption spectrometry is proposed. Precise known volumes of sample, reducing agent (1.1% SnCl2 in 3% HCI) and carrier (3% HCI) are dispensed into a gas-liquid separation cell with a multisyringe burette coupled with one three-way solenoid valve. An argon flow delivers the reduced mercury to the spectrometer. The optimization of the system was carried out testing reaction coils and gas-liquid separators of different design as well as changing parameters, such as sample and reagents volumes, reagent concentrations and carrier gas flow rate, among others. The analytical curves were obtained within the range 50-5000 ng L-1. The detection limit (3 sigma(b)/S) achieved is 5 ng L-1. The relative standard deviation (R.S.D.) was 1.4%, evaluated from 16 successive injections of 250 ng L-1 Hg standard solution. The injection and sample throughput per hour were 44 and 11, respectively. This technique was validated by means of solid and water reference materials with good agreement with the certified values and was successfully applied to fish samples. (c) 2006 Elsevier B.V. All rights reserved.
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