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Determination of Trace Cr(VI) with Diphenylcarbazide by μFIA–Thermal Lens MicroscopyTatyana Gor’kova,
Michail Proskurnina,
Mingqiang Liu,
Mladen Franko, 2016, original scientific article
Abstract: The optimum reaction parameters for the interaction of hexavalent chromium [Cr(VI)] with diphenylcarbazide in microfluidic
chips (μFIA) with thermal-lens microscopic detection were selected. The characteristic feature of the applied
flow scheme is the injection of the reagent into the stream containing the test metal, which enables in-field and
real-time monitoring of Cr(VI) simply by flowing the sample continuously through the microchip. The limit of detection
of Cr(VI) under the selected conditions (signal generating wavelength, 514.5 nm; excitation power, 100 mW; detection
position, 10 cm downstream from the mixing zone of the microchip; flow rate 10 μL min–1; injection volume,
1.4 μL) is 15 ng mL–1 (2.9 × 10–7 mol L–1). The linear range is 40 ng mL–1 – 10 μg mL–1 with a relative standard deviation
no higher than 10% in the concentration range 0.1–1 μg mL–1. The online monitoring by this scheme provides the
possibility of up to 360 analyses per hour.
Keywords: Photothermal lensing, thermal-lens microscopic detection, microfluidic applications, μFIA, hexavalent
chromium, diphenylcarbazide
Published in RUNG: 12.12.2016; Views: 5224; Downloads: 0
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