Thin film hydride generation: determination of ultra-trace copper by flow injection in situ hydride trapping graphite furnace AAS

Abstract

A novel system which significantly enhances copper hydride generation efficiency was used for the determination of trace copper by coupling a flow injection system to a graphite furnace for in-situ collection of the analyte and subsequent AAS detection. A single device integrated the functions of hydride generator and gas liquid separator.Solutions of the sample, acidified to 1 % formic acid, and tetrahydroborate reductant were merged to yield a thin film wetting a reaction surface from which product vapor was efficiently liberated and transported to the heated furnace. Optimum operating conditions provided for a generation / transport / collection efficiency of 8-12%. Interferences from common transition and noble metals were effectively eliminated. A limit of detection of 60 pg ml -1 was obtained based on processing a 5 mL sample volume with a precision of better than 4% (RSD) at 1 ng mL -1 . The methodology was successfully applied to the determination of Cu in several NRCC natural w ater and biological tissue Certified Reference Materials.3

Determination of Arsenic by Hydride Generation—Laser-Induced Breakdown Spectroscopy: Characterization of Interelement Interferences

“…LIBS analysis of this black deposit inside the tubing revealed the presence of arsenic. Similar observation have been reported in the literature (Singh et al 1996;Zheng, Sturgeon, and Hou 2010) for atomic absorption and LIBS systems that utilize HG-sample introduction method.…”

Atomic spectrometry update. Environmental analysis

“…An analytical precision of 0.75 % RSD was obtained at the 100 ng mL -1 level and the method was validated against the NRCC CRM SLRS-5 River water. This research team 155 also developed a thin film HG method with ETAAS detection for the determination of trace Cu. Using tetrahydroborate as the reductant, the overall efficiency was 8-12%.…”

Recent advances in flow-based sample pretreatment for the determination of metal species by atomic spectrometry

“…The use of enhancement regents or modifiers was also demonstrated to be effective. A simple and cost-effective thin film hydride generator has been successfully used for HG and the determination of trace copper by flow injection in situ hydride trapping GFAAS [95]. This approach possessed the advantages of rapid generation and fast separation of the unstable gaseous copper species from the liquid phase.…”