المستودع الأكاديمي جامعة المدينة

Determinação de fósforo em aços por espectrometria de absorção atômica no forno de grafite

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dc.creator Curtius Adilson José
dc.date 1998
dc.date.accessioned 2013-05-30T10:56:41Z
dc.date.available 2013-05-30T10:56:41Z
dc.date.issued 2013-05-30
dc.identifier http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40421998000300003
dc.identifier http://www.doaj.org/doaj?func=openurl&genre=article&issn=01004042&date=1998&volume=21&issue=3&spage=253
dc.identifier.uri http://koha.mediu.edu.my:8181/jspui/handle/123456789/4289
dc.description A method for the determination of phosphorus in steel samples by graphite furnace atomic absorption spectrometry, using the Zeeman effect background correction and the STPF conditions is proposed. The effect of iron (III) on the phosphorus signal was studied. It was verified, through the pyrolysis temperature curves, that iron (III) is an efficient chemical modifier, thermically stabilizing phosphorus up to 1400ºC. The phosphorus signal increases with the iron (III) concentration, but in the range, which corresponds to the usual concentrations of iron in the sample solutions, the increase is small. Phosphorus was determined in three standard reference materials, after its dissolution in a mixture of hydrochloric and perchloric acids in a PTFE bomb. The agreement with the certified concentration values was excellent. Iron (III) was added to the reference analytical solutions prepared in the blank of the dissolution, while the sample solutions were measured directly, since they already contained the modifier. The detection limit (k = 2) was 0.0042% of phosphorus in the steel sample.
dc.publisher Sociedade Brasileira de Química
dc.source Química Nova
dc.subject graphite furnace atomic absorption spectrometry
dc.subject steel
dc.subject phosphorus
dc.title Determinação de fósforo em aços por espectrometria de absorção atômica no forno de grafite


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