An investigation of electroosmotic flow and pressure pumped luminol chemiluminescence detection for cobalt analysis in a miniaturised total analytical systemElectronic Supplementary Information available. See http://www.rsc.org/suppdata/lc/b1/b107061d/

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Abstract
The luminol chemiluminescence reaction has been investigated for the determination of cobalt in a planar glass micro reactor. Reagents were mobilised within an etched glass chip with 200 μm wide channels using either electrically driven flow with voltages below 200 V cm−1 or negative pressure pumping. Surfactants were used to assist mobilisation of the luminol for electrically driven flow and this also increased the chemiluminescence intensity in that system. A calibration over seven orders of magnitude was achieved for cobalt(II) nitrate with the negative pressure pumping system, and the limit of detection at the 95% confidence level was 3 × 10−11 mol l−1. The limit of detection for the electrokinetic flow was 4 × 10−11 mol l−1 and the linear range was between 10−10 to 10−6 mol l−1. The advantages and disadvantages of both mobilisation methods are discussed for this reaction.

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