Flow cell hydride generation

For sample introduction, flow-cell hydride generation can be used without the need to remove the excess of hydrogen from the reaction gases, giving a detection limit of 40 ng/mL for As. Also, the discontinuous hydride generation technique using NaBH4 pellets can be used and then an absolute detection limit for As of... 

Boron, Li, Mo, Pb, and Sb were determined in the standard mode, while Al, Cd, Co, Ni, Mn, Rb, Sb, Sn, and V were determined in the DRC mode. The determination of Ni was done with a gas flow of 0.15 ml min-1 of CH4, while for the other elements NH3 was used as cell gas at 0.4 ml min-1. The determination of Se by flow injection hydride generation atomic absorption spectrometry (FI-HG-AAS) was carried out by means of the Perkin-Elmer FLAS 200 system, equipped with the Perkin-Elmer autosampler AS-90, and connected to an electrically heated quartz cell installed on a PerkinElmer absorption spectrometer AAS 4100. The analytical conditions are given in Table 10.3. 

Danadurai, K. S. K., Hsu, Y.-L., and Jiang, S.-J. (2002) Determination of selenium in nickel-based alloys by flow injection hydride generation reaction cell inductively coupled plasma mass spectrometry. J. Anal. At. Spectrom., 17, 552-5. 

There are several sample introduction methods that are used in conjunction with ICP, including nebulization, electrothermal evaporation, gas chromatography, hydride generation, and laser ablation [30]. Laser ablation combined with ICP (LA-ICP) is useful for analysis of solids. In such a source the sample is positioned in a chamber prior to the ICP source, the ablation cell. Argon gas at atmosperic pressure flows through the cell towards the ICP source. The sample is irradiated by a laser beam and... 

Analyzer Q = quadrupole, CC = collision cell, DRC = dynamic reaction cell, MC = multicollector, SF = sector field. Analytical details CV = cold vapor, ETV = electro-thermal vaporization, FI = flow injection, HG = hydride generation, ID = isotope dilution, LA = laser ablation, UN = ultrasonic nebulization. Sample introduction in liquid or slurry (si) form. 

Fig. 54. Modified flow-cell type hydride generator. (Reprinted with permission from Ref. [155].)...

Broekaert J. A. C. Optimization of electrochemical hydride generation in a miniaturized flow cell coupled to microwave-induced plasma, atomic emission spectrometry for the determination of selenium, Fresenius Journal of Analytical Chemistry, in press. 

Fig. lO Schematic figure of a FI hydride generation AAS system with segmented carrier stream and tubular membrane dual phase gas diffusion separator reponed in ref. 48. S. sample At, aigon flow T, microporous PTFE tubing G, dual-phase gas-diffusion separator, BH, borohydride reductant W, waste and AAS, quartz atomizer cell. 

Fig.5.11 Schematic diagram of an integrated Veaction-separation cell for hydride generation reponed in ref. 52. A, B, plastic blocks with engraved cavities, inlets and outlets C]. cavity packed with P, anion-exchanger C2. cavity for separated gas M. microporous PTFE membrane N. support netting S/R. inlet for acidified sample and borohydride regenerent W, waste flow H2, hydrogen carrier gas D, flame-in-tube aiom-...

Fig.8.4 FI manifold and operational parameters of hydride generation AAS system (valve in sample fill position) for Se and As. V, injector valve L, sample loop SP, gas-liquid separator, S, acidified sample C, acid carrier. AAS. quartz cell atomizer W, waste flows a. b, reaction coils Ar, stabilized argon flow [3].

---