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Direct analysis of Ca, P, and Fe in oleochemicals by inductively coupled plasma MS
Author(s) -
Wiedemann Sophie C. C.,
Abbes Henkjan,
Hansen Wei G.
Publication year - 2004
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/s11746-004-0919-2
Subject(s) - torch , argon , inductively coupled plasma mass spectrometry , inductively coupled plasma , plasma torch , dilution , chemistry , plasma , analytical chemistry (journal) , oxide , inductively coupled plasma atomic emission spectroscopy , materials science , chromatography , metallurgy , mass spectrometry , physics , organic chemistry , quantum mechanics , welding , thermodynamics
This paper presents the use of inductively coupled plasma MS (ICP‐MS) for direct elemental analysis in oleochemicals (long‐chain fatty acid derivative). It focuses on Ca, P, and Fe, which are key elements for many industrial applications and which are known to be challenging for MS technology. The instrument is operated with a “shield torch” interface under “high‐power cool plasma.” In addition, oxygen is blended with argon to prevent buildup of carbon on both torch and cones. The extra sensitivity of the ICP‐MS technology permits high dilution factors, thereby minimizing any potential matrix effects. The contents of Ca, P, and Fe are quantified by standard addition. There is no need to resort to interference corrections for P, because it is measured as its oxide PO + . Detection limits lie in the sub‐ppm for Ca and P and in the low‐ppb for Fe. Accuracy of the method has been demonstrated for our products by a recovery test.