Determination of Mercury in Coal Using Radiochemical Neutron Activation Analysis†

Blanchard, L.J.; Robertson, J. D.

doi:10.1039/a704012a

Cited by 12 publications

(7 citation statements)

References 11 publications

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“…This method allows a non-destructive analysis in which the sample is analyzed directly without the need for any pre-treatment. Its main advantage is that it is very precise and sensitive (Blanchard and Robertson, 1997;Dams, 1992;Olmez, et al, 1993;Olmez et al, 1995).…”

Section: Solid and Liquid Samplesmentioning

confidence: 99%

Analytical methods for mercury analysis in coal and coal combustion by-products

López-Antón

Dı́az-Somoano

Ochoa-González

et al. 2012

International Journal of Coal Geology

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This review deals with the analysis of mercury present in different types of solid, liquid and gaseous samples involved in the coal combustion process, focusing on the specific characteristics of each type of sample and the problems typically associated with these products. The main aim of the paper is to describe the methods that, at the current stage of development, are preferable in each case (i.e. the most frequently used in most laboratories and the standard methods). The advantages and disadvantages of each method are discussed with reference to the quality of the results and the uncertainties involved in the evaluation of mercury behaviour during coal combustion processes.

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Section: Solid and Liquid Samplesmentioning

confidence: 99%

Analytical methods for mercury analysis in coal and coal combustion by-products

López-Antón

Dı́az-Somoano

Ochoa-González

et al. 2012

International Journal of Coal Geology

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“…The removal of mercury from the coal matrix by mild pyrolysis combined with a variety of detection methods has also been employed. 10,14,15,[20][21][22][23] Evans et al 24 used pyrolysis in an oxygen stream at 1200 °C to remove mercury from several coal and fly ash materials prior to measurement of high-precision isotope ratios using four different multicollector ICPMS instruments. Owing to the low levels of mercury in the materials, the mercury was preconcentrated on gold and the measurements were made on transient signals.…”

mentioning

confidence: 99%

Determination of Mercury in Coal by Isotope Dilution Cold-Vapor Generation Inductively Coupled Plasma Mass Spectrometry

Long

Kelly

2002

Anal. Chem.

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A method based on isotope dilution cold-vapor inductively coupled plasma mass spectrometry (ID-CV-ICPMS) has been developed for high-accuracy determinations of mercury in bituminous and sub-bituminous coals. A closed-system digestion process employing a Carius tube is used to completely oxidize the coal matrix and chemically equilibrate the mercury in the sample with a 201Hg isotopic spike. The digestates are diluted with high-purity quartz-distilled water, and the mercury is released as a vapor by reduction with tin(II) chloride. Measurements of 201Hg/202Hg isotope ratios are made using a quadrupole ICPMS system in time-resolved analysis mode. The new method has some significant advantages over existing methods. The instrument detection limit is less than 1 pg/mL. The average blank (n = 17) is 30 pg, which is roughly 1 order of magnitude lower than the equivalent microwave digestion procedure. The detection limit in coal is blank limited and is approximately 40 pg/g. Memory effects are very low. The relative reproducibility of the analytical measurements is approximately 0.5% for mercury concentrations in the range 10-150 ng/g. The method has been used to measure mercury concentrations in six coal reference materials, SRM 1632b (77.4 ng/g), SRM 1632c (94.3 ng/g), BCR 40 (433.2 ng/g), BCR 180 (125.0 ng/g), BCR 181 (135.8 ng/g), and SARM 20 (252.6 ng/g), as well as a coal fly ash, SRM 1633b (143.1 ng/g). The method is equally applicable to other types of fossil fuels including both crude and refined oils.

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“…There are several methods of determining trace levels of mercury and copper in a variety of samples, which include atomic absorption spectrometry, spectrofluorimetry, voltametry, chromatographic methods and neutron activation analysis [12][13][14][15]. However, spectrophotometric methods are both easier and cheaper than these methods [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and complexation properties of a novel Mg-porphyrazine with metal ions in acetonitrile-chloroform

Kabay

Bayğu

Gök

et al. 2015

Main Group Chemistry

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The synthesis and characterization of a novel metal derivative of a peripherally symmetrically tetrasubstituted porphyrazine derived from 25, 26-dioxa-6,7,9,10,15,16,18,19-octahydro-25H-1,24-methanodibenzo[q,t][1,4, 13,16,17,10]tetraoxadithiacyclohenicosine-12,13-dicarbonitrile was carried out. The influence of metal cations such as Zn 2+ , Fe 2+ , Mn 2+ , Ni 2+ , Co 2+ , Hg 2+ and Cu 2+ on the spectroscopic properties of the ligands, the starting material dinitrile and MgPz were investigated in acetonitrile-chloroform solution (1/1) by means of absorption spectrometry. Absorption spectra showed isosbestic points in the spectrophotometric titration of Cu 2+ and Hg 2+ with MgPz ligand. The results of spectrophotometric titration experiments disclosed the complex stability constant of the novel ligand, MgPz with Cu 2+ and Hg 2+ cations.

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Determination of Mercury in Coal Using Radiochemical Neutron Activation Analysis†

Cited by 12 publications

References 11 publications

Analytical methods for mercury analysis in coal and coal combustion by-products

Analytical methods for mercury analysis in coal and coal combustion by-products

Determination of Mercury in Coal by Isotope Dilution Cold-Vapor Generation Inductively Coupled Plasma Mass Spectrometry

Synthesis, characterization and complexation properties of a novel Mg-porphyrazine with metal ions in acetonitrile-chloroform

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