Quartz furnace

QFAAS Quartz furnace atomic absorption (2) Segmented charge-coupled... 

Figure 5.20. a Chromatogram of stibine, methylstibine, and dimethylstibine as separated by the OV-3 trap/column with the quartz furnace/AA detector. The stibines were prepared by the NaBH4 reduction of 2 ng Sb each as Sb (III), methylstibonic, and dimethylstibonic acid, b Analysis of a sample of seawater (100 ml) from the open Gulf of Mexico (Station SN4-3-1, 12 March 1981)... 

A full experimental design was employed to set the best conditions of a heated electrospray interface intended to couple quartz furnace AAS with HPLC... 

FAAS, ICP-MS A flow injection-hydride generation-quartz furnace... 

Szpunar, J., Ceulemans, M., Schmitt, VO., Adams, F.C. and Lobinski, R. (1996) Microwave-accelerated speciation analysis for butyltin compounds in sediments and biomaterials by large volume injection capillary gas chromatography quartz furnace atomic absorption spectrometry. Anal. Chim. Acta, 332, 225-232. 

Figure 6.1 Bar-graph of MeHg in CRM 580. The results correspond to six replicate determinations as performed by different laboratories using various methods. MEANS indicates the mean of laboratory means with 95% confidence interval. Abbreviations-. CVAAS, cold vapour atomic absorption spectrometry CVAFS, cold vapour atomic fluorescence spectrometry ECD, electron capture detection GC, gas chromatography HPLC, high-performance liquid chromatography ICPMS, inductively coupled plasma mass spectrometry MIP, microwave induced plasma atomic emission spectrometry QFAAS, quartz furnace atomic absorption spectrometry SFE, supercritical fluid extraction.

U.S. Environmental Protection Agency. 2001. Method 1632. Chemical speciation of arsenic in water and tissue by hydride generation quartz furnace atomic absorption spectrometry. 

Donard, O.F.X., S. Rapsomanikis, and J.H. Weber. 1986. Speciation of inorganic tin and alkyltin compounds by atomic absorption spectrometry using electrothermal quartz furnace after hydride generation. Anal. Chem. 58 772-777. 

The burner of a fused-quartz furnace (see Fig. 114) is placed at the bottom of a number of superimposed quartz sections in the form of pipe 1000 mm high and 400 mm in diameter. Into the lower section a pipe closed with a mica plate is inserted through which the hydrogen is ignited and the course of the process is inspected according to the colour of the flame. The lower part of the furnace is covered by a cylindrical steel jacket and rests on supports. The quartz sections... 

For clcmcnt-speciPc detection in GC, a number of dedicated spectrometric detection techniques can be used, for example, quartz furnace AAS or atomic Bu-orescence spectrometry (AFS) for Hg, or microwave-induced plasma atomic emission spectrometry (MIP-AES) for Pb or Sn. However, ICP-MS is virtually the only technique capable of coping, in the on-line mode, with the trace element concentrations in liquid chromatography (LC) and capillary electrophoresis (CE) efBuents. The femtogram level absolute LoDs may still turn out to be insufficient if an element present at the nanogram per milliliter level splits into a number of species, or when the actual amount of sample analyzed is limited to some nanoliters as in the case of CE or nanoBow HPLC. The isotope spcciPcity of ICP-MS offers a still underexploited potential for tracer studies and for improved accuracy via isotope dilution analysis. 

The as-prepared ZSM-48 was calcined in air at 500°C for 48 hrs to give H,Na-ZSM-48. This was washed with 1.0 M HC1 at 25°C for 3 hrs to give H-ZSM-48. The material was then heated at 450°C for 30 hrs in a tubular quartz furnace (Hamdan, H. Sulikowski, B. Klinowski, J. T. Phvs. Chem.. in press) with water being injected at a rate of 12 ml per hour into the tube by a peristaltic pump so that the partial pressure of H2O above the sample was 1 atmosphere. It was then exchanged with 1 M NH4NO3 and steamed at 650°C for a further 16 hrs. The ammonium exchange was repeated and the zeolite steamed at 650°C for 16 hrs and at 800°C for 8 hrs. XRD diffraction patterns (not shown) did not indicate any loss of crystallinity upon thermal treatment. 

Ricci and coworkers have described a highly sensitive, automated technique for the determination of MMAA, DMAA, p-aminophenyl arsonate, arsenite and arsenate. This procedure is based on ion-chromatography on a Dionex column, with 0.0024 M NaHC03/0.0019 M NajCOj/O.OOl M Na2B407 eluent, when all the compounds except arsenite and dimethyl arsinite are separated effectively. For separation of the last two, a lower ionic strength eluent (0.005 M Na2B407) can be used in a separate analysis. The detection system utilizes a continuous arsine generation system followed by heated quartz furnace atomization and atomic absorption spectrometry. Detection limits of less than 10 ng/ml were obtained for each species. 

QFAAS, quartz-furnace atomic absorption spectroscopy FPD, flame photometric detection MS, mass spectrometry ICP-MS, inductively coupled plasma-mass spectrometry. 

A selenium speciation study was carried out by Seby etal. (1997) on a seleniferous soil using hydride generation quartz furnace atomic absorption spectrometry (HG-QFAAS) method and after alkaline extraction. The speciation was performed in order to identify and determine inorganic and organic selenium forms. 

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