The Experts below are selected from a list of 171 Experts worldwide ranked by ideXlab platform
Adriana A M Perrone - One of the best experts on this subject based on the ideXlab platform.
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determination of total mercury in sushi samples employing direct mercury analyzer
Food Analytical Methods, 2015Co-Authors: Marcelo Antonio Morgano, Raquel Fernanda Milani, Adriana A M PerroneAbstract:In this study a simple, fast, and low-chemical-consuming method was evaluated for the determination of total mercury in sushi samples by thermal decomposition amalgamation atomic absorption spectrometry (TDA-AAS) using a direct mercury analyzer (DMA). A small portion of fresh sushi sample (60 mg) is combusted in nickel or quartz containers, and the released mercury is trapped in a gold Amalgamator, being desorbed at high temperatures and measured in an atomic absorption cell. The method accuracy was evaluated using certified reference materials (CRM) rice flour (NIST SRM 1568b), fish protein (NRC DORM-4), peach leaves (NIST SRM 1547), and oyster tissue (NIST SRM 1566b), and the method accuracy varied between 94 and 112 % for all the CRM. Analytical curves were prepared using 0.5 % nitric acid solutions (v/v) for low (0.5 to 50 μg kg−1) and high concentrations (100 to 1000 μg kg−1) and the correlation coefficients were above 0.999. The detection and quantification limits were 0.4 and 1.4 μg kg−1, respectively. The method was applied to 30 sushi samples of tuna, salmon, and kani from Campinas City, Sao Paulo State, Brazil, and the results ranged from 6.2 to 761, 1.5 to 4.0, and <1.4 to 13.5 μg kg−1, respectively. High amounts of total mercury were found in samples of tuna sushi, and tuna was the ingredient that most contributed to dietary Hg exposure.
Pierre Pelchat - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of a Direct Solid Sampling Atomic Absorption Spectrometer for the Trace Determination of Mercury in Geological Samples
The Analyst, 1997Co-Authors: Gwendy E.m. Hall, Pierre PelchatAbstract:This paper reports the evaluation of a new cold vapour atomic absorption spectrometer applied to the direct determination of Hg in geological materials. The AMA-254 is based on thermal decomposition of the sample and collection of the evolved Hg vapour on a gold Amalgamator. A suite of 33 reference materials, including rocks, soils, sediments and coal, was analysed in duplicate, using sample masses ranging from ca. 30 to 300 mg. Agreement with recommended values was good for all but one sample, TILL-1, where this method produced high results of 145 µg kg - 1 Hg compared to a proposed value of 92 µg kg - 1 obtained by HCl–HNO 3 digestion. Precision, over the range of Hg in these samples of 4 to 6250 µg kg - 1 , was shown to be 10% (±5% RSD). Cycle time was 5 min per sample.
Marcelo Antonio Morgano - One of the best experts on this subject based on the ideXlab platform.
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determination of total mercury in sushi samples employing direct mercury analyzer
Food Analytical Methods, 2015Co-Authors: Marcelo Antonio Morgano, Raquel Fernanda Milani, Adriana A M PerroneAbstract:In this study a simple, fast, and low-chemical-consuming method was evaluated for the determination of total mercury in sushi samples by thermal decomposition amalgamation atomic absorption spectrometry (TDA-AAS) using a direct mercury analyzer (DMA). A small portion of fresh sushi sample (60 mg) is combusted in nickel or quartz containers, and the released mercury is trapped in a gold Amalgamator, being desorbed at high temperatures and measured in an atomic absorption cell. The method accuracy was evaluated using certified reference materials (CRM) rice flour (NIST SRM 1568b), fish protein (NRC DORM-4), peach leaves (NIST SRM 1547), and oyster tissue (NIST SRM 1566b), and the method accuracy varied between 94 and 112 % for all the CRM. Analytical curves were prepared using 0.5 % nitric acid solutions (v/v) for low (0.5 to 50 μg kg−1) and high concentrations (100 to 1000 μg kg−1) and the correlation coefficients were above 0.999. The detection and quantification limits were 0.4 and 1.4 μg kg−1, respectively. The method was applied to 30 sushi samples of tuna, salmon, and kani from Campinas City, Sao Paulo State, Brazil, and the results ranged from 6.2 to 761, 1.5 to 4.0, and <1.4 to 13.5 μg kg−1, respectively. High amounts of total mercury were found in samples of tuna sushi, and tuna was the ingredient that most contributed to dietary Hg exposure.
John Carroll - One of the best experts on this subject based on the ideXlab platform.
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determination of mercury in environmental and biological samples using pyrolysis atomic absorption spectrometry with gold amalgamation
Analytica Chimica Acta, 2000Co-Authors: Claire T Costley, Katharine F Mossop, John R Dean, Louise M Garden, John Marshall, John CarrollAbstract:This paper is concerned with a new, rapid technique for the determination of total mercury in environmental and biological samples. This technique features the pyrolysis of the sample in a combustion tube at 750°C under an oxygen atmosphere, collection on a gold Amalgamator and subsequent detection by atomic absorption spectrometry (AAS) using a silicon UV diode detector. This technique has the advantage of no sample pre-treatment and is free from matrix interference. Eight certified reference materials (CRMs) have been analysed and were found to give results in good agreement with the certified values. The levels determined ranged from 0.035 to 7.06 mg/kg with an average relative standard deviation of 3.6% (n = 8).
Gwendy E.m. Hall - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of a Direct Solid Sampling Atomic Absorption Spectrometer for the Trace Determination of Mercury in Geological Samples
The Analyst, 1997Co-Authors: Gwendy E.m. Hall, Pierre PelchatAbstract:This paper reports the evaluation of a new cold vapour atomic absorption spectrometer applied to the direct determination of Hg in geological materials. The AMA-254 is based on thermal decomposition of the sample and collection of the evolved Hg vapour on a gold Amalgamator. A suite of 33 reference materials, including rocks, soils, sediments and coal, was analysed in duplicate, using sample masses ranging from ca. 30 to 300 mg. Agreement with recommended values was good for all but one sample, TILL-1, where this method produced high results of 145 µg kg - 1 Hg compared to a proposed value of 92 µg kg - 1 obtained by HCl–HNO 3 digestion. Precision, over the range of Hg in these samples of 4 to 6250 µg kg - 1 , was shown to be 10% (±5% RSD). Cycle time was 5 min per sample.