Determination of cobalt, copper, iron, nickel and zinc in cemented tungsten carbides with cobalt as a binder by FAAS: Matrix effect control by multivariate technique

Piippanen, T.; Jaatinen, Jouko; Pirjetä, Aarni; Tummavuori, Jouni

doi:10.1007/s002160050507

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“…In general, XRF analysis necessitates prior fusion of the sample, a task requiring considerable practice. 7 Atomic absorption methods have been published by ISO 8,9 and Piippanen et al 10 Emission measurement methods have been used by Piippanen et al 4 and Thomson 11 but these are the only published methods which could be found.…”

Section: Introductionmentioning

confidence: 99%

“…Tungsten carbide powder is highly resistant to acid attack and the dissolution process is lengthy, ranging from 45 min to several hours, even when hydrofluoric acid is added. The dissolution methods published by ISO 8,9 and Piippanen et al 10 all have the drawback of being fairly time-consuming and employing undesirable reagents such as hydrofluoric acid, boric acid and phosphoric acid. Hydrofluoric acid in an analytical solution may etch glassware and instrument components.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of cobalt, tantalum, titanium, vanadium and chromium in tungsten carbide by inductively coupled plasma-optical emission spectrometry

Archer

McCrindle²,

Rohwer

2003

J. Anal. At. Spectrom.

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SYNOPSISInductively coupled plasma-optical emission spectroscopy was used to measure the concentrations of cobalt, tantalum, titanium, vanadium and chromium in solutions of tungsten carbide. The main advantage of the method described here lies in the speed, convenience and effectiveness of the dissolution procedure. Aliquots ofpowdered tungsten carbide are dissolved in 5% aqua regia in 30% hydrogen peroxide. Complete dissolution was usually achieved within 10 minutes. The accuracy and precision of this novel method was assessed by the analysis of certified reference materials, secondary reference materials and matrix spiking. The method was successfully applied to commercial type samples with differing compositions. SAMEVATTINGInduktief gekoppeIde plasma-optiese emissie spektrometrie is gebruik om die konsentrasie van kobalt, tantaal, titaan, vanadium en chroom in oplossings van wolframkarbied te bepaal. Die hoofvoordeel van die metode wat hier beskryf word, is die spoed, gemak en doeltreffendheid van die monster voorbereiding. Verpoeierde wolframkarbied monsters het gewoonlik binne 10 minute opgelos na die byvoeging van 'n mengsel bestaande uit 5% aqua regia in 30% waterstofperoksied. Die akkuraatheid en presisie van hierdie nuwe metode is ondersoek deur gesertifiseerde verwysingsmateriale en sekondere verwysingsmateriale te ontleed, asook deur matrysbyvoegings. Die metode is suksesvol toegepas op kommersieele monsters met verskillende samestellings.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%