Repozitorij Univerze v Novi Gorici

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Naslov:Microfluidic flow injection thermal lens microscopy for high throughput and sensitive analysis of sub-μL samples
Avtorji:Liu, Mingqiang (Avtor)
Malovrh, Sara (Avtor)
Franko, Mladen (Avtor)
Datoteke:.pdf Cr(VI).pdf (828,33 KB)
 
Jezik:Angleški jezik
Vrsta gradiva:Delo ni kategorizirano (r6)
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:UNG - Univerza v Novi Gorici
Opis:An analytical method combining microfluidic flow injection analysis (μFIA) with thermal lens microscopy (TLM) was developed for high throughput and sensitive analysis of sub-μL samples. Performance of the μFIA-TLM was validated for detection of hexavalent chromium [Cr(VI)] in water samples. At different sample injection volumes, detection positions and flow rates, influences of the reaction time and the diffusion of Cr-diphenylcarbazone (DPCO) complexes on the μFIA-TLM signal were investigated. Photodegradation of the Cr-DPCO complex was clearly observed when the absorbed photons per Cr-DPCO is above 1600. After optimization of the TLM with respect to rapid flows (up to 10 cm/s), we achieved a limit of detection of 0.6 ng/mL for Cr(VI) in a 50-μm deep channel. Impacts of interfering ions [V(V), Mo(VI), Fe(III)] on the Cr(VI) determination were found to be small. Cr(VI) in real samples from a cement factory were determined and found in good agreement with results of spectrophotometry. This μFIA-TLM shows advantages over its conventional counterpart, such as eliminating additional sample conditioning, reducing over 100 times the sample consumption to sub-μL and over 10 times the time required for one sample injection to a few seconds (up to 20 samples/min). The optimized μFIA-TLM setup can be applied for fast and sensitive analysis of nonfluoresent sub-μL samples in rapidly flowing mediums.
Ključne besede:Spektrometrija TLS, mikroskopija TLM, mikrofluidika, krom (VI)
Leto izida:2016
Št. strani:8
Številčenje:8
COBISS_ID:4365051 Povezava se odpre v novem oknu
URN:URN:SI:UNG:REP:GJHFAC3A
DOI:10.1039/C6AY00932H Povezava se odpre v novem oknu
Število ogledov:2302
Število prenosov:148
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Področja:Gradivo ni uvrščeno v področja.
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Gradivo je del revije

Naslov:Analytical methods
Skrajšan naslov:Anal. Methods
ISSN:ISSN 0003-2654
Leto izida:2016

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