简介:INTRODUCTION
Trace levels of iodide are necessary for normal
physical and mental development; however, excess iodide
can lead to thyroid disorders. Common sources of iodide
include iodized table salt and seafood, but简介:INTRODUCTION
Trace levels of iodide are necessary for normal
physical and mental development; however, excess iodide
can lead to thyroid disorders. Common sources of iodide
include iodized table salt and seafood, but other food
products also contain iodide. Within the dairy industry,
iodophors are used as disinfectants, which can also lead to
increased iodide consumption by the public.
1
A concern
over high iodide levels in the diet has led to a nutritional
labeling requirement for iodide/iodine.
In this Application Note, ion chromatography coupled
with pulsed amperometric detection is used to determine
iodide in milk products. This method is specific, sensitive,
and rapid. Iodide is separated on the IonPac® AS11
column, which contains a hydrophilic, anion-exchange
resin that is well suited to the chromatography of the
relatively hydrophobic iodide anion. Using a nitric acid
eluent, the iodide ion elutes from the column in less than
5 minutes. Although iodide can be detected by direct
current (dc) amperometry on a silver working electrode,
a
pulsed amperometric waveform is used in this Application
Note to improve the reproducibility of iodide analysis.
2
Like dc amperometry, the detection limit of iodide using
pulsed amperometric detection is in the low µg/L range.详细>