Corrosion of transversely heated graphite tubes by iron and lanthanum matrices

Ortner, Hugo M.; Röhr, Udo; Schlemmer, Gerhard; Weinbruch, Stephan; Welz, Bernhard

doi:10.1016/s0584-8547(01)00367-6

Cited by 16 publications

(14 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…верхности платформы или стенки или отслоение пиролитического покрытия графитовой печи [9,107], что ухудшает чувствительность определения фос-фора и увеличивает значение характеристической массы (с 3-4 нг Р до 6 нг при использовании лан-тана в качестве химического модификатора) [12]. Устранить изменения на поверхности платформы или стенки графитовой печи можно обработкой поврежденной поверхности 20 мкл 1 % раствора ZrOCl 2 [3] для восстановления дефектов в решет-ке графитовой платформы в результате образова-ния карбида циркония.…”

Section: т 20 №unclassified

“…образование индивидуальных соединений между фосфором и модификатором. Так, например, ав-торы работы [107] предполагают именно такой ме-ханизм стабилизации фосфора фторидом натрия за счет образования пирофосфата натрия Na 4 P 2 O 7 (T плавления = 988 °С). Такие противоречивые данные говорят о возможности одновременного проявле-ния этих механизмов.…”

Section: фторидыunclassified

See 1 more Smart Citation

A spectral phosphorus determination using its electrothermal and atomization with various chemical modifiers (Review)

Pupyshev¹,

Zaitceva²,

Zaitceva³

2016

АиК

View full text Add to dashboard Cite

Section: т 20 №unclassified

Section: фторидыunclassified

A spectral phosphorus determination using its electrothermal and atomization with various chemical modifiers (Review)

Pupyshev¹,

Zaitceva²,

Zaitceva³

2016

АиК

View full text Add to dashboard Cite

“…However, the papers [10,11] indicate that the analyte penetrates into the walls of graphite furnace at the depth of about several tens of micrometers. Besides, the study of analytical characteristics during the graphite furnace corrosion [12] shows that the profile of atomic absorption signal depends on the surface condition. The double-peak signals of Ag, Bi, Te in the presence of permanent modifiers can exemplify the influence of surface effects on the form of atomic absorption signal [13].…”

Section: Introductionmentioning

confidence: 99%

Simulation of atomic absorption signals: A kinetic model with two independent sources

Buhay

Rogulsky

Kulik

et al. 2005

Spectrochimica Acta Part B: Atomic Spectroscopy

View full text Add to dashboard Cite

“…It has been shown earlier [2][3][4][5][6] that the form of the analytical signal depends substantially on the state of the furnace surface and the degree of its wear, and the necessity of creating a model that would take into account penetration of a sample into the surface pores has been substantiated [2]. Such a model may also be of use in studying the influence of permanent modifiers on the mechanism of atomization [7].…”

Section: Introductionmentioning

confidence: 99%

Kinetic Model of Entry of Free Atoms into an Electrothermal Atomizer

et al. 2005

View full text Add to dashboard Cite

A kinetic phenomenological model of the processes of atomization for atomic-absorptional spectrometry with electrothermal atomization that is based on solution of a one-dimensional equation of diffusion with two independent sources is suggested. The model takes into account the processes occurring both on the surface of a graphite furnace and inside its wall. The proposed model is used for describing the electrothermal atomization of copper and zinc.Introduction. It is known that in the method of atomic-absorption spectrometry with electrothermal atomization (ETAAS), a metered amount of the sample analyzed is delivered onto the graphite surface of a furnace (or platform) on which its thermal treatment and atomization occur. A liquid sample not only spreads over the surface but also penetrates into the pores of the furnace material under the action of capillary forces, as a result of which the conditions of sample atomization are altered [1,2]. It is evident that here the state and properties of the graphite surface play a significant role.It has been shown earlier [2-6] that the form of the analytical signal depends substantially on the state of the furnace surface and the degree of its wear, and the necessity of creating a model that would take into account penetration of a sample into the surface pores has been substantiated [2]. Such a model may also be of use in studying the influence of permanent modifiers on the mechanism of atomization [7].To construct a correct phenomenological model of sample atomization in a graphite furnace it is necessary to consider two sources of free atoms: one on the furnace surface and the other inside its walls. The present work is devoted to the solution of this problem. For experimental checking of the model, we selected copper and zinc, the mechanisms of atomization of which are different.Theory. In constructing the model, we use some facts and assumptions.1) The atomic absorption A(t) is proportional to the mass M(t) of the free atoms that are present in the analytical volume of the furnace in a gas phase.2) In delivering metered amounts of a sample into the furnace (or onto the platform), a portion of the liquid sample penetrates into graphite under the action of capillary forces [1, 2]. As the total initial mass of the atoms M 0 placed inside an atomizer we take the mass of the atoms participating in formation of an analytical signal. It can be represented as the sum of the masses of atoms on the surface of the furnace and inside its pores:

show abstract

Corrosion of transversely heated graphite tubes by iron and lanthanum matrices

Cited by 16 publications

References 20 publications

A spectral phosphorus determination using its electrothermal and atomization with various chemical modifiers (Review)

A spectral phosphorus determination using its electrothermal and atomization with various chemical modifiers (Review)

Simulation of atomic absorption signals: A kinetic model with two independent sources

Kinetic Model of Entry of Free Atoms into an Electrothermal Atomizer

Contact Info

Product

Resources

About