Thorium and iodine memory effects  in inductively-coupled plasma mass spectrometry

Al-Ammar, Assad S.; Reitznerová, Eva; Barnes, Ramon M.

doi:10.1007/s002160100837

Cited by 34 publications

(24 citation statements)

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“…MS measurements of volatile elements, such as Cd, I, Pb, Li and Hg [26]. However, to our knowledge, it was not reported previously for analysis performed by GD sources.…”

Section: Optimization Of Analysis Conditions For Depth Profiling Of Pmentioning

confidence: 69%

Rapid evaluation of different perovskite absorber layers through the application of depth profile analysis using glow discharge – Time of flight mass spectrometry

Fernández

Lobo

Tyagi

et al. 2019

Talanta

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Depth profile analysis of perovskite absorber layers deposited onto glass substrates is investigated by radiofrequency pulsed glow discharge-time of flight mass spectrometry (rf-PGD-ToFMS). Elemental depth profiles obtained for perovskite films fabricated using a double-step deposition route with different precursors (methylammonium iodide and PbI2, PbCl2 or PbBr2) show varying distribution of the principle components depending on the precursors employed. Furthermore, the results show that rf-PGD-ToFMS allows to identify traces of residue solvent used in the initial film preparation (dimethyl sulphoxide or dimethylformamide) and to identify differences produced by film thickness and oxygen uptake caused by exposure to ambient conditions. The approach also enables inspection of the differences in elemental diffusion and the degradation processes. By using rf-PGD-ToFMS, no ultra-high-vacuum is needed for processing and rapid analysis of absorber films can be obtained in less than 40 s. The demonstration of such powerful analytical technique for obtaining depth profile information could enable groups in the field to better optimize processing conditions and enhance stability.

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“…MS measurements of volatile elements, such as Cd, I, Pb, Li and Hg [26]. However, to our knowledge, it was not reported previously for analysis performed by GD sources.…”

Section: Optimization Of Analysis Conditions For Depth Profiling Of Pmentioning

confidence: 69%

Rapid evaluation of different perovskite absorber layers through the application of depth profile analysis using glow discharge – Time of flight mass spectrometry

Fernández

Lobo

Tyagi

et al. 2019

Talanta

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“…Tais compostos podem ser retidos na superfície da câmara de nebulização e tubulação de transporte, gerando instabilidades de sinais em medidas posteriores e, consequentemente, erros sucessivos nas medidas. 22 Portanto, para evitar a formação dos compostos voláteis de iodo e, por consequência, o efeito de memória, devem ser utilizadas soluções alcalinas preparadas em meios contendo NaOH, TMAH ou CFA-C nos sistemas de introdução de amostra e no preparo das mesmas. 8 O mecanismo de ação do CFA-C com o iodo ainda é desconhecido, porém alguns estudos demonstraram a eficiência desse reagente comparativamente a outros meios alcalinos.…”

Section: Resultados E Discussão Avaliação Do Efeito De Memóriaunclassified

Avaliação de ICP OES com configuração axial ou radial para determinação de iodo em sal de cozinha

Oliveira¹,

Nóbrega²,

Pereira-Filho³

et al. 2012

Quím. Nova

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Recebido em 8/5/11; aceito em 23/2/12; publicado na web em 15/6/12 EVALUATION OF ICP OES WITH AXIAL OR RADIAL VIEWS FOR DETERMINATION OF IODINE IN TABLE SALT.The performance of inductively-coupled plasma optical emission spectrometers with axial and radial views for determination of iodine in table salt was evaluated. Interference and memory effects in nitric acid and water-soluble tertiary amines (CFA-C) media were studied. Based on a factorial experiment, one optimum instrument operational condition for axial configuration, and two optima conditions for radial configuration was established. The ICP OES with axial view was 5-fold more sensitive than the radial view. Both matrix matching and standard addition methods were used for iodine quantification and for most samples, both strategies of calibration led to similar results. Recoveries ranged from 104 to 114%.Keywords: iodine; ICP OES; table salt. INTRODUÇÃOO iodo é essencial para a formação de tirosina (T 4 ) e de tri-iodotironina (T 3 ), dois hormônios da tireoide, importantes para o controle de diversas funções do corpo humano, tais como metabolismo celular, temperatura corporal, reprodução e crescimento.A carência de iodo pode causar mau funcionamento (hipotireoidismo) ou doenças da glândula tireoide (bócio), cretinismo, retardo mental, aumento de mortalidade perinatal e desenvolvimento de anomalias.1 Entretanto, o consumo exagerado pode levar ao aumento das doenças autoimunes da tireoide e ao hipertireoidismo. 2Quantidades elevadas de iodo são encontradas nos oceanos e em alimentos de origem marinha. Exceto para populações que vivem em regiões litorâneas, os alimentos marinhos são consumidos em pequenas quantidades, sendo assim, ovos e leite são as principais fontes de iodo. No entanto, o teor de iodo encontrado nesses alimentos ainda não é suficiente para suprir as necessidades diárias recomendadas pela OMS (Organização Mundial de Saúde). Uma das maneiras de supri-las na alimentação da população é a adição desse elemento aos alimentos. No Brasil, em março de 2003, a Agência Nacional de Vigilância Sanitária (ANVISA) estabeleceu que o sal destinado ao consumo humano deve conter uma concentração de iodo igual ou superior a 20 mg kg -1 até o limite máximo de 60 mg kgMétodos espectrofotométricos clássicos para determinação de iodo envolvem o complexo colorido formado entre iodo e amido 4 e, também, reações catalíticas nas quais o iodeto age como catalisador na reação redox entre Ce(IV) (amarelo) e As(III) formando os íons incolores Ce(III) e As(V). Essa reação catalítica é conhecida como reação de Sandell-Kolthoff e por muitos anos representou o estado da arte para a determinação de iodo em materiais biológicos. 5,6 Além de procedimentos espectrofotométricos bem estabelecidos, 4 algumas técnicas têm sido aplicadas para a determinação de iodo em amostras variadas, incluindo espectrometria de absorção atômica com chama (FAAS, Flame Atomic Absorption Spectrometry), 7 aná-lise por ativação neutrônica (NAA, Neutron Activation Analysis), O desenvolvimento de métod...

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“…107 Although this method is considered highly effective for metal determination, halogens can be lost when using concentrated or oxidizing acids. 144,145 In this sense, some methods have been developed using stabilizing agents to prevent volatilization. 53,[146][147][148][149] Some studies demonstrated the feasibility of NH 4 OH solution as a stabilizing agent for further bromine and iodine determination in honey 59 and soil.…”

Section: Sample Preparation Methods For Further Halogen Determinatimentioning

confidence: 99%

Challenges and trends for halogen determination by inductively coupled plasma mass spectrometry: A review

Flores

Mello

Krzyzaniak

et al. 2020

Rapid Comm Mass Spectrometry

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Rationale In this review, works published in the past 25 years for fluorine, chlorine, bromine, and iodine determination in several matrices by inductively coupled plasma mass spectrometry (ICP‐MS) were covered. Usually, the determination of halogens has been performed by ICP‐MS using a previous sample preparation step or, more recently, by direct analysis of solid or liquid samples. Methods Methods based on combustion, extraction, pyrohydrolysis, sample dilution in organic or aqueous medium, and wet digestion, among others, are discussed. Moreover, the recent applications of methods based on laser ablation (LA) and electrothermal vaporization (ETV) coupled to ICP‐MS are discussed. Results The main challenge for methods using sample preparation has been to obtain a final solution compatible with ICP‐MS, as well as to overcome problems related to analyte losses and contamination. Interferences due to the presence of dissolved organic compounds in solution, enhancement or suppression of ionization of analytes, and related matrix effects have been of concern when using ICP‐MS. For the determination of halogens by ICP‐MS using LA and ETV systems, some limitations related to the difficulty of calibration are pointed out, impairing the widespread use of this approach. Conclusions A critical view is presented for further halogen determination by ICP‐MS, mainly for matrices considered difficult to digest using conventional protocols.

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Thorium and iodine memory effects in inductively-coupled plasma mass spectrometry

Cited by 34 publications

References 0 publications

Rapid evaluation of different perovskite absorber layers through the application of depth profile analysis using glow discharge – Time of flight mass spectrometry

Rapid evaluation of different perovskite absorber layers through the application of depth profile analysis using glow discharge – Time of flight mass spectrometry

Avaliação de ICP OES com configuração axial ou radial para determinação de iodo em sal de cozinha

Challenges and trends for halogen determination by inductively coupled plasma mass spectrometry: A review

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