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Title:Determination of Trace Cr(VI) with Diphenylcarbazide by μFIA–Thermal Lens Microscopy
Authors:ID Gor’kova, Tatyana, Lomonosov Moscow State University (Author)
ID Proskurnina, Michail, Lomonosov Moscow State University (Author)
ID Liu, Mingqiang, UNG (Author)
ID Franko, Mladen, UNG (Author)
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Language:English
Work type:Not categorized
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
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
Publication version:Version of Record
Year of publishing:2016
Number of pages:772-780
Numbering:63
PID:20.500.12556/RUNG-2851-56e36fe3-a32f-a809-1bbf-f16bc0bd7475 New window
COBISS.SI-ID:4602875 New window
DOI:10.17344/acsi.2016.2549 New window
NUK URN:URN:SI:UNG:REP:QQNFZC6I
Publication date in RUNG:12.12.2016
Views:4565
Downloads:0
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Record is a part of a journal

Title:Acta Chimica Slovenica
Shortened title:Acta Chim. Slov.
Publisher:Slovenian Chemical Society
Year of publishing:2016
ISSN:1318-0207

Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:12.12.2016

Secondary language

Language:Slovenian
Title:Določevanje sledov Cr(VI) z difenilkarbazidom in μFIA–TLS mikroskopijo
Abstract:Za dolo~anje {estvalentnega kroma [Cr(VI)] s preto~no injekcijsko analizo v mikrofluidnem sistemu (μFIA) in detekcijo z mikroskopijo na osnovi toplotnih le~, smo izbrali optimalne reakcijske pogoje za interakcijo Cr(VI) s kolorimetri~nim reagentom difenilkarbazidom. Glavna zna~ilnost uporabljenega preto~nega sistema je injiciranje reagenta v nosilni tok, ki vsebuje analit. To, ob stalnem pretoku vzorca skozi mikro~ip, v praksi omogo~a kontinuirni monitoring Cr(VI) v realnem ~asu. Pri izbranih pogojih (vzbujevalna valovna dol`ina 514,5 nm, mo~ vzbujanja 100 mW, to~ka detekcije 10 cm po to~ki me{anja, pretok 10 μL min–1, injicirani volumen 1,4 μL) smo dosegli mejo zaznave 15 ng mL–1 (2,9 × 10–7 mol L–1). Pri tem je bilo obmo~je linearnosti 40 ng mL–1 – 10 μg mL–1, relativni standardni odmik v koncentracijskem obmo~ju 0.1–1 μg mL–1 pa manj{i od 10 %. Opisani sistem omogo~a kontinuirno merjenje koncentracije Cr(VI) s 360 analizami na uro.


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