This limitation acknowledged, we are currently working to address this
shortcoming with additional complexation agents. For this
study, 2.5 and 5.0 μg of Fe and Ni were each determined from a
solution comprised of equal amounts of Fe and Ni, 4× less Cu,
and 10× less of each of the interfering metals. Detection of 5.0
μg Fe and Ni from this study is shown in Figure 6a. When the