Determination of Total Selenium Content in Cereals and Bakery Products by Flow Injection Hydride Generation Graphite Furnace Atomic Absorption Spectrometry Applying in-situ Trapping on Iridium-Treated Graphite Platforms

Ajtony, Zsolt; Szoboszlai, Norbert; Bella, Zsuzsanna Ilona Katalin de Jármy Di; Bolla, Szilvia; Szakál, P.; Bencs, László

doi:10.1007/s00604-005-0330-y

Cited by 16 publications

(10 citation statements)

References 2 publications

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“…27 Se levels are in general, low in soils in Scandinavia. However, Se levels in cereals, treated with non Se-supplemented fertilizers, generally are <100 μg/g, 28 which is approximately at the same level as in the vegetables of this study.…”

Section: Discussionmentioning

confidence: 51%

Mineral Element Concentrations in Vegetables Cultivated in Acidic Compared to Alkaline Areas of South Sweden

Rosborg

Gerhardsson

Nihlgård

2009

Air, Soil and Water Research

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A study in 1997, on mineral levels in acidic compared to alkaline well waters, and in women's hair, revealed higher concentrations of a number of mineral elements like Ca, Mo and Se in alkaline waters and hair. Thus, median Ca levels were six times higher in well water and fi ve times higher in hair from the alkaline area compared to the acidic area. This fi nding raised the probability of similar differences in vegetables from these areas. Thus, in the year 2006, 60 women who had participated in the study in 1997 were asked to cultivate parsley, lettuce, carrot and chive. During the spring of 2006, the women from the water and hair study of 1997, 30 of them from the acidic area and 30 women from the alkaline district cultivated vegetables: carrot (Daucus carota L), parsley (Petroselinum crispum), chive (Allium schoenoprasum) and lettuce (Eruca sativa). The vegetables were harvested, and rinsed in tap water from the kitchens of the participating women in August. The concentrations of about 35 elements and ions were determined by ICP OES and ICP-MS predominantly. In addition, soil samples from the different cultivators were also analyzed for a number of elements. Lettuce and parsley showed the highest concentrations of mineral elements per gram dry weight. Only Mo concentrations were signifi cantly higher in all the different vegetables from the alkaline district compared to vegetables from the acidic areas. On the other hand, the concentrations of Ba, Br, Mn, Rb and Zn were higher in all the different vegetables from the acidic area. In the soil, only pH and exchangeable Ca from the alkaline area were higher than from the acidic area, while exchangeable Fe, Mn and Na concentrations were higher in soils from the acidic area. Soil elements like Al, Fe, Li, Ni, Pb, Si, Ti, V, Zn and Zr were found in higher concentrations in lettuce and parsley, which were attributed to soil particles being splashed on the plants by the rain and absorbed by the leaves. Strong correlations appeared between Ca and Sr in all the vegetables, except for carrot. No strong correlations were found between soil elements and vegetable elements, except for soil Mn and carrot/lettuce Mn. The differences in mineral levels in both, vegetables and soils were however small, compared to differences in well waters and hair. It was also suggested that the garden soils on limestone bedrock had been drained of minerals and thereby, the soil had an acidic pH. The contribution of mineral elements to daily intake in humans was considered minor from the analysed vegetables, except for some samples of lettuce that should give signifi cant contributions of Ca, Zn, Mn and Mo. The main conclusion is that, differences in water and hair mineral levels between the two areas in the earlier study (1997) were not mirrored in vegetables cultivated in 2006. Principally, this suggests that, for humans the mineral intake of some elements from water may be more important than from vegetables.

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Section: Discussionmentioning

confidence: 51%

Mineral Element Concentrations in Vegetables Cultivated in Acidic Compared to Alkaline Areas of South Sweden

Rosborg

Gerhardsson

Nihlgård

2009

Air, Soil and Water Research

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“…Table 1 summarizes this temperature program, inspired by Shaltout et al 35 and involving gradual drying of the solution followed by pyrolysis and clean-out steps. Relatively long drying time and the successive treatment of the graphite tube are important to attain an ideal and more stable metallic coverage of the surface and a longer life-time of the Ir permanent modifier 36 . The whole procedure was repeated five times to yield a total amount of 200 µg Ir.…”

Section: Graphite Tube Pre-treatmentmentioning

confidence: 99%

“…While too low trapping temperatures could result in incomplete deposition of volatile compounds, excessive temperatures could lead to losses and/or complications with the interface 25,36 . The impact of the atomizer temperature on the signal response during the trapping step was studied in the temperature interval from 100 to 600 °C.…”

Section: Collection Temperaturementioning

confidence: 99%

“…Relatively long drying time and the successive treatment of the graphite tube are important to attain an ideal and more stable metallic coverage of the surface and a longer life-time of the Ir permanent modier. 36 The whole procedure was repeated ve times to yield a total amount of 200 mg Ir. No further coating was needed during the long-term measurement; more than a thousand experiments were carried out.…”

Section: Graphite Tube Pre-treatmentmentioning

confidence: 99%

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UV-photochemical vapour generation with in situ trapping in a graphite tube atomizer for ultratrace determination of selenium

Rybínová

Červený

Rychlovský

2015

J. Anal. At. Spectrom.

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A very sensitive method has been developed for the determination of selenium (Se(IV)) utilizing continuous UVphotochemical vapour generation followed by in-situ trapping and atomization of the generated volatile compounds in the graphite tube atomizer. Formic acid was chosen as a photochemical agent for the UV-assisted conversion of the analyte from the condensed to the gaseous phase. The only other chemical added to the liquid reaction mixture was nitric acid, which significantly increased the analytical signal. Introduction of selenium volatile products into the graphite tube covered with an iridium permanent modifier was operated automatically. Optimum experimental conditions for generation, collection and atomization of volatile compounds were found and the analytical characteristics of the method were subsequently determined. A very low concentration limit of detection 4.1 ng L −1 of Se(IV) (corresponding to an absolute LOD 18 pg) was achieved. The repeatability expressed as % RSD was 3.0% at 0.5 µg L −1 Se(IV). The figures of merit were compared with those obtained by chemical vapour generation using a borohydride/acid system; lower LODs were attained for UV-photochemical vapour generation. An overall efficiency of all the processes from generation to collection of volatile compounds of more than 80% was estimated. The effect of various concomitants on the selenium signal was also investigated. Finally, the accuracy of the studied method was successfully verified by analysis of the certified reference material NIST SRM 1643e and two spiked river water samples.

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“…The LOD was 11 mg l À1 . Ajtony et al analysed cereals and bakery products 184 by FI-HG-ETAAS with in-atomizer trapping on iridium. They concluded that the overall efficiency of generation, transport and trapping was about 86%, and the LOD was 0.06 mg l À1 , corresponding to 3 mg kg À1 in a solid sample.…”

Section: Vapour Generation Of Individual Elementsmentioning

confidence: 99%

Atomic spectrometry update. Advances in atomic emission, absorption and fluorescence spectrometry, and related techniques

Evans

Day

Palmer

et al. 2006

J. Anal. At. Spectrom.

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Determination of Total Selenium Content in Cereals and Bakery Products by Flow Injection Hydride Generation Graphite Furnace Atomic Absorption Spectrometry Applying in-situ Trapping on Iridium-Treated Graphite Platforms

Cited by 16 publications

References 2 publications

Mineral Element Concentrations in Vegetables Cultivated in Acidic Compared to Alkaline Areas of South Sweden

Mineral Element Concentrations in Vegetables Cultivated in Acidic Compared to Alkaline Areas of South Sweden

UV-photochemical vapour generation with in situ trapping in a graphite tube atomizer for ultratrace determination of selenium

Atomic spectrometry update. Advances in atomic emission, absorption and fluorescence spectrometry, and related techniques

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