Determination of mercury by electrothermal atomic absorption spectrometry using different chemical modifiers or a slurry technique

Abstract

The applicability of different chemical modifiers for thermal stabilization and ETAAS determination of mercury is studied. The modifier effect is strongly influenced by the type of acid and acid content in the sample solution. A method is described for mercury determination in tuna fish and sediment after high pressure digestion with nitric acid, using thioacetamide (TAC) as chemical modifier. The method permits determination of 0.5 pg g-' mercury. A simpler and faster procedure using a slurry technique for the determination of mercury in reference materials (tuna fish, spinach, cabbage and sediments) was also evaluated. Optimal instrumental parameters for mercury determination in slurries are presented. On the basis of the results obtained a new procedure which allows determination of 0.1 pg g-' mercury was developed.

Solvent dependent competition between fluorescence resonance energy transfer and through bond energy transfer in rhodamine appended hexaphenylbenzene derivatives for sensing of Hg2+ ions

“…1 Given these health and environmental concerns, efforts are being made for detection and quantification of Hg 2+ ions in various environmental and biological samples. In this context, development of mercury selective fluorescent chemosensors 2 has attracted considerable research interest due to their high sensitivity, selectivity and simplicity over other traditional methods including atom absorption spectroscopy, 3 induced coupled plasma spectroscopy, 4 X-ray fluorescence spectrometry, 5 and anodic stripping voltammetry. 6 Several fluorescent chemosensors involving different photophysical processes like photoinduced electron/energy transfer, 7 metal-ligand charge transfer (MLCT), 8 intramolecular charge transfer (ICT), 9 excimer/exciplex formation, 10 imine isomerization, 11 chelation enhanced fluorescence (CHEF) 12 have been reported.…”

Ultra-low level optical detection of mercuric ions using biogenic gold nanotriangles

“…All different forms of mercury are finally oxidized to form stable mercuric ions (Hg 2+ ), which serve as major water and soil contaminants. 2 A number of techniques for the accurate and sensitive detection of mercury contamination in a variety of samples have been developed; some of them include electrothermal atomic absorption spectroscopy (ETAAS), 3 cold-vapor atomic absorption spectroscopy (CVAAS), 4 cold-vapor inductively coupled plasma-mass spectrometry (CV-ICP-MS), 5,6 atomic fluorescence spectrometry (AFS), 7 neutron activation, 8 high performance liquid chromatography (HPLC), 9,10 thermometric continuous-flow sensor system, 11 surface plasmon resonance spectroscopy, 12 and voltammetry. 13 Recently, attempts have been made to improve upon the detection limits using a colorimetric technique.…”

Evaluation of two flow injection systems for mercury speciation analysis in fish tissue samples by slurry sampling cold vapor atomic absorption spectrometry

“…The detection limits of both mercury speciation methods could only be compared for total mercury determination in slurried biological samples with others previously published because no work was found in relation to mercury speciation analysis in slurried fish tissue samples. The detection limits obtained by both proposed methods were: better than others reported for electrothermal atomic absorption spectrometry (ETAAS) 14,15 and those corresponding to the FIMS method were lower than those achieved by ETAAS 16 or electrothermal vaporization inductively coupled plasma mass spectrometry (ETV-ICP-MS), 17 similar than those obtained by ETV-ICP-MS 18,19 or FI-CV-AAS, 8 but slightly worse than those reported for FI-CV-AFS. 7…”