Development of ultrasound-assisted digestion methods for the determination of toxic element concentrations in ash samples by ICP-OES

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Show simple item record Ilander, Aki 2011-06-20T08:56:26Z 2011-06-20T08:56:26Z 2011
dc.identifier.isbn 978-951-39-4358-5
dc.identifier.issn 0357-346X
dc.identifier.uri en
dc.description.abstract The present thesis introduces several ultrasound-assisted digestion methods developed for the determination of toxic element concentrations in ash samples by inductively coupled plasma optical emission spectrometry (ICP-OES). Ultrasound-assisted digestion is a quite new technique used for sample pre-treatment purposes, especially in difficult sample matrixes. Elements determined are As, Ba, Co, Cr, Cu, Ni, Pb, Sb, Sr, V, and Zn. Most of the elements determined exist at a trace or ultra trace level in ashes and most are potential risks in the environment or human body even at low concentrations. Most of the selected elements can be determined directly by ICP-OES, but for the determination of Sb the hydride generation technique (HG-ICP-OES) is needed. The accurate analysis of As can be performed with the direct ICP-OES measurement and with the HG device. Several optimization procedures for digestion methods and ICP-OES measurements were performed. The homogeneity of ultrasound field in the water bath, the robustness of plasma conditions, the optimization of digestion time and the composition of acid mixture were investigated. Interferences of determination procedures were minimized by using matrix matched calibration solutions, optimized volumes of reagents and by performing the measurements under robust plasma conditions. The methods developed were evaluated by statistical tools, reference material and method, recovery tests and multiple linear regression technique. All the methods developed were tested with real ash samples. The suggested analytical procedures were summarised and achieved results were compared with other results published. This thesis is based on four scientific papers: two of them are more focused on the study of ultrasound-assisted digestion (I,II) and the other two are focused on investigations of interferences in the measurements and the determination of hydride forming elements (III,IV).
dc.format.extent 58, [30] sivua
dc.language.iso eng
dc.publisher University of Jyväskylä
dc.relation.ispartofseries Research report / Department of Chemistry, University of Jyväskylä no. 144.
dc.rights openAccess fi
dc.subject.other ash
dc.subject.other hydride generation
dc.subject.other inductively coupled plasma optical emission spectrometry
dc.subject.other interference
dc.subject.other toxic element
dc.subject.other ultrasound-assisted digestion
dc.subject.other polymorph
dc.subject.other cocrystal
dc.subject.other solvate
dc.subject.other supramolecular synthon
dc.subject.other agrochemical
dc.subject.other X-ray crystallography
dc.subject.other supramolecular chemistry
dc.subject.other structural chemistry
dc.title Development of ultrasound-assisted digestion methods for the determination of toxic element concentrations in ash samples by ICP-OES
dc.type Diss. fi
dc.identifier.urn URN:ISBN:978-951-39-4358-5
dc.subject.ysa aska
dc.subject.ysa spektrometri
dc.subject.ysa ultraljud
dc.subject.ysa giftighet
dc.subject.ysa tuhka
dc.subject.ysa spektrometria
dc.subject.ysa ultraääni
dc.subject.ysa myrkyllisyys
dc.subject.ysa maatalouskemikaalit
dc.subject.ysa torjunta-aineet
dc.subject.kota 116
dc.type.dcmitype Text en
dc.type.ontasot Väitöskirja fi
dc.type.ontasot Doctoral dissertation en
dc.contributor.tiedekunta Matemaattis-luonnontieteellinen tiedekunta fi
dc.contributor.tiedekunta Faculty of Mathematics and Science en
dc.contributor.laitos kemian laitos fi
dc.contributor.yliopisto University of Jyväskylä en
dc.contributor.yliopisto Jyväskylän yliopisto fi
dc.contributor.oppiaine kemia fi

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