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Determination of 36 elements in plant reference materials with different Si contents by inductively coupled plasma mass spectrometry: Comparison of ... [An article from: Analytica Chimica Acta]
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Author(s)J. Sucharova, I. Suchara
PublisherElsevier
ISBN / ASINB000P6ONPM
ISBN-13978B000P6ONP6
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This digital document is a journal article from Analytica Chimica Acta, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
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Closed-vessel microwave digestion of nine standard reference plant materials (NIST, BCR, IAEA) and a laboratory standard of plant material with different Si contents assisted by HNO"3+H"2O"2 (procedure A), HNO"3+H"2O"2+HF+H"3BO"3 (procedure B) and HNO"3+H"2O"2+HBF"4 (procedure C) were used to determine the recovery of 36 elements by ICP-MS: Ag, Al, As, Ba, Be, Bi, Cd, Ce, Co, Cr, Cs, Cu, Fe, Ga, Ge, In, La, Li, Mn, Mo, Nd, Ni, Pb, Pr, Rb, Sb, Se, Sn, Sr, Th, Tl, U, V, W, Y, Zn. Additions of HF+H"3BO"3 and HBF"4 in procedures B and C exceeded by 10% (B1, C1) and 100% (B2, C2) the equivalent concentrations of Si in the samples determined by ICP-OES. Most recoveries of certified elements (e.g., Al^*, Cu, Mo^*, Rb^*, Sb^*, Th) decreased significantly (^*p@?0.05) with increasing Si content in plant reference materials digested by procedure A, while the recoveries from procedures B and C decreased insignificantly only for Mo and Sb. Digestions B and C gave significantly higher recoveries of Al, Sb, W and REEs, which were tighter to the reference values of these elements. A similar effect was found for Cu, Fe, Li, Ni, Sn, Th, Tl, V, Zn, Ba, Rb and Sr recoveries in samples with Si contents exceeding 2000@mgg^-^1. If the Si content in plant samples is less than 10mgg^-^1, digestion of 0.5g of plant samples through 0.05mL of HF and 0.5mL of 4% H"3BO"3 or 0.1mL of HBF"4 is recommended to get satisfactory results for most of the elements. For materials with Si content exceeding 10mgg^-^1 the weight of the sample for digestion should be reduced to 0.25g. However, the operation of potential interferences should be taken into account and eliminated through correction equations and adequate dilution of the samples.
Description:
Closed-vessel microwave digestion of nine standard reference plant materials (NIST, BCR, IAEA) and a laboratory standard of plant material with different Si contents assisted by HNO"3+H"2O"2 (procedure A), HNO"3+H"2O"2+HF+H"3BO"3 (procedure B) and HNO"3+H"2O"2+HBF"4 (procedure C) were used to determine the recovery of 36 elements by ICP-MS: Ag, Al, As, Ba, Be, Bi, Cd, Ce, Co, Cr, Cs, Cu, Fe, Ga, Ge, In, La, Li, Mn, Mo, Nd, Ni, Pb, Pr, Rb, Sb, Se, Sn, Sr, Th, Tl, U, V, W, Y, Zn. Additions of HF+H"3BO"3 and HBF"4 in procedures B and C exceeded by 10% (B1, C1) and 100% (B2, C2) the equivalent concentrations of Si in the samples determined by ICP-OES. Most recoveries of certified elements (e.g., Al^*, Cu, Mo^*, Rb^*, Sb^*, Th) decreased significantly (^*p@?0.05) with increasing Si content in plant reference materials digested by procedure A, while the recoveries from procedures B and C decreased insignificantly only for Mo and Sb. Digestions B and C gave significantly higher recoveries of Al, Sb, W and REEs, which were tighter to the reference values of these elements. A similar effect was found for Cu, Fe, Li, Ni, Sn, Th, Tl, V, Zn, Ba, Rb and Sr recoveries in samples with Si contents exceeding 2000@mgg^-^1. If the Si content in plant samples is less than 10mgg^-^1, digestion of 0.5g of plant samples through 0.05mL of HF and 0.5mL of 4% H"3BO"3 or 0.1mL of HBF"4 is recommended to get satisfactory results for most of the elements. For materials with Si content exceeding 10mgg^-^1 the weight of the sample for digestion should be reduced to 0.25g. However, the operation of potential interferences should be taken into account and eliminated through correction equations and adequate dilution of the samples.
