Análise de suspensões de argilas por espectrometria de emissão óptica com plasma induzido com configuração axial

Abstract

Recebido em 23/1/02; aceito em 17/4/02 CLAY SLURRIES ANALYSIS USING INDUCTIVELY COUPLED PLASMA OPTICAL EMISSION SPECTROMETRY WITH AXIAL VIEW CONFIGURATION. The goal of this study was to evaluate the feasibility of direct introduction of clay slurries in an inductively coupled plasma optical emission spectrometer with axial view configuration. Calibration was performed using a certified reference material with a mean particle size of 13 µm (IPT-42) and the analytical curve was applied for quantification of two others reference materials (IPT-28 and IPT-32) and four samples. It was demonstrated that the analytical curve thus obtained was not completely suitable for IPT-28 and samples due to different mineralogical phases determined by X-ray diffraction. After considering this effect, it was possible for most elements to obtain results in agreement with certified values or with values obtained by a conventional technique at a 95% confidence level. It was demonstrated that the ICP-OES with axial view configuration did not present any incompatibility with the direct introduction of a complex inorganic suspension.

Inductively coupled plasma optical emission spectrometry with axially viewed configuration: an overview of applications

“…The ideal particle size is dependent on the type of sample introduction system used, on the thermochemical behavior of particles and on the properties of the plasma. 26 However, cement slurries 27,30 with particle sizes lower than 38 µm were accurately analysed using an axially viewed ICP OES. Babington or V-groove nebulizers are suitable for slurry nebulization in order to avoid clogging.…”

“…Additionally, residence times could also be altered. Some publications proposed the use of increasing masses of certified reference materials for the calibration, [25][26][27] but aqueous solutions could also be used. 27,[31][32][33] The use of the generalized standard additions method (GSAM), an expansion of the conventional standard additions method, has also been proposed for slurry analysis in a dual view 28 and in an axially viewed ICP OES.…”

Clay and refractory materials slurries in inductively coupled plasma optical emission spectrometry: effects of mechanochemical synthesis on emission intensities of analytes

“…This procedure was based on a procedure developed by Silva et al for analysis of clays. 12 Chemical modification effects were evaluated by changes in the emission intensities of Al, Ca, Fe, K, Mg, P, Si, and Ti measured in an ICP OES with axial viewing.…”

Decomposição de argilas em forno de microondas e determinação simultânea dos seus constituintes principais por espectrometria de emissão óptica em plasma indutivamente acoplado

“…Segundo Silva et al 2 uma das dificuldades é a obtenção de informações sobre os materiais de referên-cia certificados e as amostras que geralmente não estão disponíveis e não podem ser obtidas rapidamente. Essas informações são necessá-rias para facilitar a calibração do espectrômetro ICP OES 2 .…”