Cold vapor atomic fluorescence spectrometry

For PHg, a variety of different filter methods have been applied, such as Teflon or quartz fiber filters. Before analysis, these filters undergo a wet chemical digestion usually followed by reduction-volatilization of the Hg to Hg(0) and analysis using cold vapor atomic absorbance spectrometry (CVAAS) or cold vapor atomic fluorescence spectrometry (CVAFS). Recently, a collection device based on small qrrartz... 

Techniques for analysis of different mercury species in biological samples and abiotic materials include atomic absorption, cold vapor atomic fluorescence spectrometry, gas-liquid chromatography with electron capture detection, and inductively coupled plasma mass spectrometry (Lansens etal. 1991 Schintu etal. 1992 Porcella etal. 1995). Methylmercury concentrations in marine biological tissues are detected at concentrations as low as 10 pg Hg/kg tissue using graphite furnace sample preparation techniques and atomic absorption spectrometry (Schintu et al. 1992). 

US Environmental Protection Agency, Method 1631 Mercury in Water by Oxidation, Purge and Trap and Cold Vapor Atomic Fluorescence Spectrometry, Office of Water Fact Sheet, EPA-821-F-98-008, [US Environmental Protection Agency, 1998d]. 

L. N. Liang, G. B. Jiang, J. G. Liu, J. T. Hu, Speciation analysis of mercury in seafood by using high-performance liquid chromatography on-line coupled with cold-vapor atomic fluorescence spectrometry via a post column microwave digestion, Anal. Chim. Acta, Ml (2003), 131-137. 

Carpi and Chen (2001) used cold vapor atomic fluorescence spectrometry to measure gaseous elemental Hg inside residential and business dwellings in New York City. Indoor air Hg concentrations averaged 69 ng m (range 6.5 to 523 ng m ) over the 12 sampling locations, of which 11 showed levels of airborne Hg that were elevated compared to outdoor concentrations (range... 

Cold Vapor Atomic Fluorescence Spectrometry (CVAFS)... 

CSV cathodic stripping voltammetry CVAAS cold vapor generation atomic absorption spectrometry (specific for Hg) CVAFS cold vapor atomic fluorescence spectrometry... 

Morita, H., Sugimoto, M. and Shimomura, S. (1990) Selective determination of inorganic and total mercury by cold vapor atomic fluorescence spectrometry coupled with flow injection analysis. Anal. Sci., 6,91-95. 

Improvements have been made recently for the preconcentration of gaseous methylmercury in air by preconcentration in mist chambers and subsequent determination by aqueous-phase ethylation, precollection on carbotrap columns, separation by GC, and detection by cold vapor atomic fluorescence spectrometry (CV-AFS). In order to understand the behavior and fate of mercury compounds in the atmosphere and their role in environmental mercury cycling, there is an urgent need for further development of analytical methods to afford identification of mercury species in the atmosphere by compound-specific analytical methods (as opposed to operationally defined protocols). 

Figure 1 Steps for determination of organomercury compounds. CV-AAS, cold vapor-atomic absorption spectrometry CV-AFS, cold vapor-atomic fluorescence spectrometry GC, gas chromatography GC-ECD, gas chromatography-electron capture detection AED, atomic emission detector ICP-MS, inductively coupled plasma-mass spectrometry HPLC, high-performance liquid chromatography.

Frontier Global Sciences, FGS 069.4.1, Determination of THg inVarious Matrices by Cold Vapor Atomic Fluorescence Spectrometry (Modified EPA Method 1631E)... 

J.L. Guzman-Mar, L. Hinojosa-Reyes, A.M. Serra, A. Hemandez-Ramfrez, V. Cerda, Applicability of multisyringe chromatography coupled to cold-vapor atomic fluorescence spectrometry for mercury speciation analysis. Anal. Chim. Acta 708 (2011) 11—18. 

Figure 4.11 shows an MSFIA system coupled to cold vapor atomic fluorescence spectrometry (CV-AFS) for mercury determination in rice [47]. As can be seen for sample pick-up an extra three-way solenoid valve (V) was connected to syringe 1 (SI), syringe 2 (S2) was used to dispense the reducing solution and a solenoid micropump was used to remove the liquid-excess from the gas-liquid separator, keeping a constant liquid volume in it. 

---