英語翻譯
Dairy foods are widely consumed in the world because they are
important sources of several essential nutrients in the human diet.
This way,the determination of chemical elements in these matrices is
often required in order to establish quality control of these products
[1–5].Generally,these analyses can be easily performed employing
atomic absorption spectrometry (AAS),that calcium and magnesium
are macronutrients and,for this reason the determination of these
elements using the main lines requires high dilution of the samples.
Another difculty is the fat content that sometimes complicates the
sample preparation step [6].
The high-resolution continuum source atomic absorption spec-
trometry (HR-CS AAS) uses as continuum radiation source a high-
intensity xenon short-arc lamp,which provides a better signal-to-noise ratio than hollow cathode lamps used in line source-FAAS [7].
This feature allows the use of less sensitive secondary lines to reduce
sensitivity during the determination of major elements and avoid a
high dilution of the samples [8].This strategy has been used for the
determination of some elements in sugar-cane leaves [9] and also
cobalt and vanadium in undiluted crude oil [10].
Procedures involving simplication of the sample preparation step
for analyses of complex matrices have been developed [11].The solid
and slurry sampling techniques employing spectrometric methods
such as:high-resolution continuum source graphite furnace atomic
absorption spectrometry (HR CS GF AAS) [12,13] ame atomic
absorption spectrometry (FAAS) [14,15],inductively coupled plasma
optical emission spectrometry (ICP OES) [16,17],hydride generation
atomic absorption spectrometry (HG AAS) [18,19],electrothermal
atomic absorption spectrometry (ET AAS) [20] and others have been
proposed for analyses of several samples [21].
This paper proposes a fast analytical procedure that employs slurry
sampling for the sequential multi-element determination of calcium
and magnesium in dairy products by HR-CS FAAS.Secondary lines
were used in order to avoid a high dilution of the samples.