Iodine determination in food by inductively coupled plasma mass spectrometry after digestion by microwave-induced combustion

Mesko, Márcia F.; Mello, Paola A.; Bizzi, Cezar A.; Dressler, Valderi L.; Knapp, Günter; Flores, Érico M.M.

doi:10.1007/s00216-010-3766-9

Cited by 98 publications

(81 citation statements)

References 37 publications

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“…A reflux step can be applied after combustion, assuring an effective washing of vessel walls and holder surface, which is a great advantage over the classic combustion systems, where the cleaning step of the vessel must be performed manually. This method has been successfully applied for digestion of biological samples, 24,25 elastomers, 26 coal 27 and crude oil products [28][29][30][31][32][33] for subsequent metal and halogens determinations. In this work different cigarette tobacco samples were digested by MIC and further Br and Cl determination was performed by ICP OES.…”

Section: -15mentioning

confidence: 99%

Bromine and chlorine determination in cigarette tobacco using microwave-induced combustion and inductively coupled plasma optical emission spectrometry

Müller¹,

Bizzi²,

Pereira³

et al. 2011

J. Braz. Chem. Soc.

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A combustão iniciada com micro-ondas (MIC) foi aplicada para decomposição de amostras de tabaco de cigarro e subsequente determinação de bromo e cloro por espectrometria de emissão óptica com plasma indutivamente acoplado (ICP OES). Massas de amostra de até 500 mg foram decompostas em frascos fechados e pressurizados com 20 bar de oxigênio. A combustão foi completada em menos de 30 s e os analitos foram absorvidos em solução diluída de (NH 4 ) 2 CO 3 . A exatidão foi avaliada usando materiais de referência certificados e mediante a determinação utilizando ICP-MS. A concordância foi melhor do que 98% usando 50 mmol L -1 de (NH 4 ) 2 CO 3 como solução absorvedora e 5 min de refluxo. A temperatura durante a combustão foi superior a 1400 °C e o conteúdo de carbono residual nos digeridos após MIC foi menor que 1%. Até oito amostras podem ser decompostas simultaneamente. Limites de quantificação utilizando MIC e determinação por ICP OES foram de 12 e 6 µg g -1 para Br e Cl, respectivamente.The microwave-induced combustion (MIC) was applied for cigarette tobacco samples digestion and further determination of bromine and chlorine by inductively coupled plasma optical emission spectrometry (ICP OES). Samples masses up to 500 mg were combusted in closed vessels using 20 bar of oxygen. Combustion was complete in less than 30 s and analytes were absorbed in diluted (NH 4 ) 2 CO 3 solution. Accuracy was evaluated using certified reference materials with similar matrix composition and comparison with results obtained using ICP-MS. The agreement was better than 98% using 50 mmol L -1 (NH 4 ) 2 CO 3 as absorbing solution and 5 min of reflux. Temperature during combustion was higher than 1400 °C and the residual carbon content in digest obtained after MIC was lower than 1%. Up to eight samples could be processed simultaneously and a single absorbing solution was suitable for both Br and Cl. Limit of quantification by MIC and further ICP OES determination was 12 and 6 µg g -1 for Br and Cl, respectively.Keywords: microwave-induced combustion, cigarette, bromine, chlorine, ICP OES IntroductionTobacco leaves may be used in different forms such as smoking, chewing or sniffing. All of these forms result in a number of negative side effects on human health that are well-documented.1 Chlorine and bromine are essential for growth of the plants and minor constituents of tobacco. The content of bromine and chlorine in tobacco could vary depending on tobacco type, soil and climatic conditions. Typical concentration ranges for Br and Cl reported in tobacco are 100 to 200 and 700 to 30000 µg g -1 , respectively. Over 85% of the all halogenated compounds found in tobacco and smoke are either halogenated agrochemicals, impurities found in the agrochemicals, or decomposition products from the agrochemicals. Up to 2.4% of the bromine and chlorine can be transferred to smoke. There are 242 identified halogenated compounds in tobacco and/or tobacco smoke and chlorine and bromine are present in 192 and 12 different compounds, respectively. 2Bromine...

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Section: -15mentioning

confidence: 99%

Bromine and chlorine determination in cigarette tobacco using microwave-induced combustion and inductively coupled plasma optical emission spectrometry

Müller¹,

Bizzi²,

Pereira³

et al. 2011

J. Braz. Chem. Soc.

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“…8 Organic Br and I compounds in bio-samples have routinely been identified by chemical techniques following their isolation, and by modem spectroscopic methods, such as by GC, 9,10 HPLC and HPLC hyphened inductively coupled plasma-mass spectrometry (ICP-MS). 8 Total halogen (Br, I) in food was analyzed by ICP-OES and ICP-MS, 11,12 and other methods. The purpose of this study was to set up a method for total Br and I analysis in bio-samples with acceptable uncertainties at levels relevant to food control, and its validation.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Determination of Bromine and Iodine in Food Samples Using ICP-MS

Nguyen¹,

Ludwig

2014

ANAL. SCI.

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“…Techniques such as spectrophotometry, 6 potentiometry using ion-selective electrode (ISE), 7 ion chromatography, 8,9 inductively coupled plasma optical emission spectrometry (ICP OES), 10,11 and inductively coupled plasma mass spectrometry (ICP-MS) [12][13][14][15] can be employed for Br, I and F determination. Fluorine can also be determined by graphite furnace molecular absorption spectrometry, 16 ion chromatography 10,17 and capillary electrophoresis.…”

Section: Introductionmentioning

confidence: 99%

Determination of bromine, fluorine and iodine in mineral supplements using pyrohydrolysis for sample preparation

Taflik

Duarte

Flores

et al. 2012

J. Braz. Chem. Soc.

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Neste trabalho foi utilizada a piroidrólise para a decomposição de suplemento mineral utilizado na nutrição animal, para a posterior determinação de F, Br e I. Flúor foi determinado por potenciometria utilizando eletrodo íon-seletivo para fluoreto, enquanto que Br e I foram determinados por espectrometria de massa com plasma indutivamente acoplado. Os principais parâmetros que influenciam a piroidrólise foram investigados e, após a devida avaliação dos mesmos, foram fixadas as seguintes condições: a temperatura do reator em 1000 °C durante 10 min; a proporção entre a massa de amostra e a massa de acelerador em 1 + 5 e a vazão do gás carreador em 200 mL min -1 . A exatidão do método foi avaliada usando teste de recuperação do analito e análise de materiais de referência certificados de rocha fosfática e de solo. O método foi aplicado para análise de suplemento mineral. Os limites de quantificação foram de 16, 0,3 e 0,07 µg g -1 para F, Br e I, respectivamente. Assim, usando-se um método relativamente simples e de baixo custo é possível a decomposição de até 5 amostras por hora. Portanto, a piroidrólise pode ser usada como um método de rotina para o preparo de amostra de suplemento mineral para a determinação de F, Br e I.Pyrohydrolysis was employed for mineral supplements decomposition prior to F, Br and I determination. Fluoride determination was carried out by potentiometry using a fluoride-ion selective electrode, whereas Br and I were determined by inductively coupled plasma mass spectrometry. The main parameters that influence on pyrohydrolysis were investigated. After evaluation, the following conditions were established: reactor temperature of 1000 °C during 10 min; sample plus accelerator mass ratio of 1 + 5 and carrier gas (air) flow rate of 200 mL min -1 . The accuracy of the proposed method was evaluated by analyte recovery tests and analysis of certified reference materials of phosphate rock and soil. Commercial mineral supplement samples were analyzed. The limits of quantification were 16, 0.3 and 0.07 µg g -1 for F, Br and I, respectively. By using a relatively simple and low cost pyrohydrolysis system up to 5 samples can be processed per hour. The developed sample preparation procedure can be routinely employed for F, Br and I determination in mineral supplements. Keywords: pyrohydrolysis, halogens determination, mineral supplement IntroductionSeveral elements are essential for animals growing and breeding. Those elements required in high amounts are called macronutrients (Ca, Cl, K, P, Mg, Na, and S) and those elements required in low concentrations are called micronutrients (Co, Cu, Fe, I, Mn, Mo, Se, Zn, and eventually Cr and F are included in this group). 1 The main functions of essential elements in the organism are associated to the structural composition of body and enzymatic and hormonal processes.Although F usually increases the strength of bones and teeth, this element is generally not considered as essential. 1 Fluorine is usually present as a contaminant since it is Taflik et al. 489 ...

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Iodine determination in food by inductively coupled plasma mass spectrometry after digestion by microwave-induced combustion

Cited by 98 publications

References 37 publications

Bromine and chlorine determination in cigarette tobacco using microwave-induced combustion and inductively coupled plasma optical emission spectrometry

Bromine and chlorine determination in cigarette tobacco using microwave-induced combustion and inductively coupled plasma optical emission spectrometry

Quantitative Determination of Bromine and Iodine in Food Samples Using ICP-MS

Determination of bromine, fluorine and iodine in mineral supplements using pyrohydrolysis for sample preparation

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