Low volume microwave digestion and direct determination of selenium in biological samples by hydride generation-atomic fluorescence spectrometry

Zhao, Qingguo; Chen, Yu Wei; Belzile, Nelson; Wang, Mohui

doi:10.1016/j.aca.2010.03.040

Cited by 21 publications

(11 citation statements)

References 22 publications

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“…The stability of TMSe + in different chemical reagents was investigated in a microwave digestion system using two types of Teflon digestion vials: 100 or 6 mL (38). The obtained results (Table 2) are not in agreement with those obtained by D'Ulivo et al (31,32).…”

Section: The Stability Of Tmse + Under Chemical Attackscontrasting

confidence: 58%

“…It was found that, unlike many other organo-selenium compounds (38,39), the chemical bonds between Se and C in TMSe + become very stable once it is dissolved in water. It was shown that after 2.5 h of UV irradiation (300 nm), neither Se (IV) nor Se (VI) -two possible decomposition products by UV cleavagewas formed, indicating that no Se-C bond had been broken under a strong UV attack with a total output power of 336 W. A close to 100% recovery of Se in this solution as measured by graphite furnace-atomic absorption spectrometry (GF-AAS) suggests that there should be no significant loss in Se by the formation of any volatile selenium compounds, such as dimethyl selenide, during UV treatment ( …”

Section: The Stability Of Tmse + Under Uv Irradiationmentioning

confidence: 98%

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Synthesis, identification and chemical features of high-purity trimethylselenonium iodide

Zhao

Chen

Montaut

et al. 2010

Journal of Sulfur Chemistry

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High-purity (99.8% ± 1.1) trimethylselenonium iodide (TMSeI) was synthesized from dimethyl selenide and methyl iodide. Its chemical structure was confirmed using the spectroscopic methods of nuclear magnetic resonance, Fourier transform infrared and electrospray ionization-mass spectrometry. Some thermodynamic properties of the pure TMSeI were studied with differential scanning calorimetry, and its decomposition point and entropy were determined to be 157.7 • C and 100.7 kJ mol −1 , respectively. The chromatographic and UV absorption behavior of the trimethylselenonium cation was also studied and the photochemical and chemical stability of TMSe + and its decomposition products under varying microwave digestion conditions were examined. Some peculiar, yet interesting chemical properties on the stability of the compound were revealed. This is the first time that the chemical properties of this compound are comprehensively studied by various techniques and from different angles. The high purity of the synthesized compound allows it to be used as a primary standard compound in analytical method development and in basic and environmentally related studies.

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Section: The Stability Of Tmse + Under Chemical Attackscontrasting

confidence: 58%

Section: The Stability Of Tmse + Under Uv Irradiationmentioning

confidence: 98%

Synthesis, identification and chemical features of high-purity trimethylselenonium iodide

Zhao

Chen

Montaut

et al. 2010

Journal of Sulfur Chemistry

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“…Particulate Se was measured on subsections of filters collected with in situ pumps (Munson et al, ) after microwave digestion (800‐W microwave; 20 min at 10% power then 20 min at 20% power to slowly increase temperature). Filters were placed in Teflon bombs with 5 mL of a 10:1 concentrated HNO 3 :H 2 SO 4 mixture (Zhao et al, ). The volume filtered was determined from the total volume filtered by the in situ pump and the fraction of the filter that was analyzed.…”

Section: Experimental Methodsmentioning

confidence: 99%

The Global Marine Selenium Cycle: Insights From Measurements and Modeling

Mason

Soerensen

DiMento

et al. 2018

Global Biogeochemical Cycles

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Anthropogenic activities have increased the selenium (Se) concentration in the biosphere, but the overall impact on the ocean has not been examined. While Se is an essential nutrient for microorganisms, there is little information on the impact of biological processes on the concentration and speciation of Se in the ocean. Additionally, other factors controlling the distribution and concentration of Se species are poorly understood. Here we present data gathered in the subtropical Pacific Ocean during a cruise in 2011, and we used these field data and the literature, as well as laboratory photochemical experiments examining the stability and degradation of inorganic Se (both Se (IV) and Se (VI)) and dimethyl selenide, to further constrain the cycling of Se in the upper ocean. We also developed a multibox model for the biosphere to examine the impact of anthropogenic emissions on the concentration and distribution of Se in the ocean. The model concurs with the field data indicating that the Se concentration has increased in the upper ocean waters over the past 30 years. Our observational studies and model results suggest that Se (VI) is taken up by phytoplankton in the surface ocean, in contrast to the results of laboratory culture experiments. In conclusion, while anthropogenic inputs have markedly increased Se in the atmosphere (42%) and net deposition to the ocean (38%) and terrestrial landscape (41%), the impact on Se in the ocean is small (3% increase in the upper ocean). This minimal response reflects its long marine residence time.

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“…However, its oxidizing power is not always sufficient to ensure complete transformation of the sample carbon component to carbon dioxide [ 12 ]. For this reason it is often augmented with auxiliary oxidizing regents like HClO 4 [ 13 , 14 ], H 2 O 2 [ 15 ], and H 2 SO 4 [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Digestion Procedure and Residual Carbon on Manganese, Copper, and Zinc Determination in Herbal Matrices by Atomic Absorption Spectrometry

Adamczyk-Szabela

Anielak

Wolf

2017

Journal of Analytical Methods in Chemistry

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Mineralization to the complete oxidation of sample carbon component does not always assure the best analyte recovery. Particular attention should be paid to the presence of silicon in the investigated plant sample and especially in the certified reference material for which Si content is scarcely given by the providers. During mineralization without addition of the hydrofluoric acid, the residual carbon may block silica surfaces and increase availability of an analyte for its spectral determination in the solution. This issue is of particular relevance because standard protocols for digestion of plant matrices often do not support hydrofluoric acid addition. Several procedures recommended for decomposition of herbal plants were applied for the respective certified reference material and examined in detail. Manganese, copper, and zinc contents were analyzed in all samples by the flame atomic absorption spectrometry. Additionally, the residual carbon was determined in all mineralizates. Silicon content was analyzed by the X-ray fluorescence method. The best recoveries were observed for samples characterized by relatively high residual carbon.

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Low volume microwave digestion and direct determination of selenium in biological samples by hydride generation-atomic fluorescence spectrometry

Cited by 21 publications

References 22 publications

Synthesis, identification and chemical features of high-purity trimethylselenonium iodide

Synthesis, identification and chemical features of high-purity trimethylselenonium iodide

The Global Marine Selenium Cycle: Insights From Measurements and Modeling

Influence of Digestion Procedure and Residual Carbon on Manganese, Copper, and Zinc Determination in Herbal Matrices by Atomic Absorption Spectrometry

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