Simultaneous automatic determination of trace amounts of copper and cobalt by use of a flow-through sensor and first-derivative spectrometry
Simultaneous automatic determination of trace amounts of copper and cobalt by use of a flow-through sensor and first-derivative spectrometry
复制标题
使用流通式传感器和一阶导数光谱法同时自动测定痕量铜和钴
作者：
Elisa Vereda;Á. Ríos;M. Valcárcel
一种同时测定钴的简易方法
A straightforward method for the simultaneous determination of cobalt
and copper in binary mixtures by use of a diode-array detector
accommodated in a flow-through spectrophotometric sensor and
pyridoxal-4-phenylthiosemicarbazone as reagent is proposed. The coloured
complexes formed give extensively overlapped spectra that can only be
resolved from their first derivative. The method relies on integrated
preconcentration and detection in the flow cell that allows a high
sensitivity in the determination of the two metal ions with detection
limits of 0.03 µg ml
-
1
for both and an RSD
(n = 11; P = 0.05) of 2.0% for cobalt and 0.9% for
copper, at a rate of 36 samples h
-
1
. The
method was applied to the determination of cobalt and copper in several
steel samples.