Page 140 - Inorganic Mass Spectrometry - Fundamentals and Applications

130 Olesik

oods
The use of ECP-MS for the analysis of foods has been reviewed recently [270].
Food analysis can provide info~ation on potentially toxic elements, nutrient
elements, or geographical origin of the food. The application of ICP-MS to
experimental nutrition has recently been reviewed [27 l]. The impo~ance of
quality control for multielement analysis of complex sample matrices like foods
by ICP-MS was shown [272].
Tin levels in fruits, vegetables, and juices were found to be higher when
unlaquered cans were used [273]. Ethanol affects ICP-MS sensitivity for many
elements. Sample preparation can affect the extent of the change in sensitivity,
intern^ standar~ization can be used to improve Pb concentration measure~ent
accuracy in wine [274]. Isotope dilution analysis can be used for accurate concen-
tration measure~ents in wine [275].
The iodine content of a variety of foods in East Africa was measured by
S [276]. Samples were dried and homogeni~ed prior to iss solution. Tell-
urium was used as an internal standard. Only saltwater fish were found to be a
sufficient dietary source of iodine.
Plants have trace element concentrations that are ch~acteristic of the soil
they are grown in. For example, the pattern of rare earth element concentrations in
wines produced from vineyards in different geographical regions was unique, and
grapes grown in the saxe area even in different years had similar patterns [277]. In
another study trace element concentration patterns could be used to differentiate
among Spanish wines from three different regions and between Spanish and
English wines [278]. Changes in soil acidity and oxidation were found also to
affect the uptake of particular elements and therefore the concentration of ele-
ments in wine [279]. The geographic origin of orange juices has also been
id en ti fie^ by ICP-MS. Variance analysis using the measurements of up to 64-
elements was used to identify elements that could best be used as geographic
indicators [280],

~eologists have been involved in the development of ICP-MS since its beginning
[28 l]. The key capabilities of ICP-MS for geological samples include low detec-
d isotopic measurement [282-2851. The most prevalent use of laser
MS is probably in the analysis of geological materials [286,287].
Geological applications have also driven the development of laser saxpling from
small (<l0 pm) spots with sufficiently high sensitivity. Sector, multicollector
inst~ments are used mainly for isotope ratio measurements of geological
samples [SS], More than 400 articles have been published on the use of ICP-MS