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000021513 084__ $$2WoS$$aBiochemical Research Methods
000021513 084__ $$2WoS$$aChemistry, Analytical
000021513 1001_ $$0P:(DE-Juel1)VDB89837$$aLiu, B.$$b0$$uFZJ
000021513 245__ $$aDetermination of heavy metal ions by microchip capillary electrophoresis coupled with contactless conductivity detection
000021513 260__ $$aWeinheim$$bWiley-Blackwell$$c2012
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000021513 440_0 $$01792$$aElectrophoresis$$v33$$x0173-0835$$y8
000021513 500__ $$aThis work was supported by grants from the Science and Technology Commission of Shanghai Municipality (Grants No. 09JC1416500, 09391911500, 10391901600, 1052nm06100), the China Scholarship Council (CSC), the German Helmholtz Association, and the German BMBF at DLR (Grant CHW09/009).
000021513 520__ $$aAn integrated detection circuitry based on a lock-in amplifier was designed for contactless conductivity determination of heavy metals. Combined with a simple-structure electrophoresis microchip, the detection system is successfully utilized for the separation and determination of various heavy metals. The influences of the running buffer and detection conditions on the response of the detector have been investigated. Six millimole 2-morpholinoethanesulfonic acid + histidine were selected as buffer for its stable baseline and high sensitivity. The best signals were recorded with a frequency of 38 kHz and 20 V(pp). The results showed that Mn(2+), Cd(2+), Co(2+), and Cu(2+) can be successfully separated and detected within 100 s by our system. The detection limits for five heavy metals (Mn(2+), Pb(2+), Cd(2+), Co(2+), and Cu(2+)) were determined to range from about 0.7 to 5.4 μM. This microchip system performs a crucial step toward the realization of a simple, inexpensive, and portable analytical device for metal analysis.
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000021513 65320 $$2Author$$aContactless conductivity detection
000021513 65320 $$2Author$$aHeavy metals
000021513 65320 $$2Author$$aMicrochip capillary electrophoresis
000021513 650_2 $$2MeSH$$aElectric Conductivity
000021513 650_2 $$2MeSH$$aElectrophoresis, Microchip: instrumentation
000021513 650_2 $$2MeSH$$aElectrophoresis, Microchip: methods
000021513 650_2 $$2MeSH$$aLimit of Detection
000021513 650_2 $$2MeSH$$aMetals, Heavy: analysis
000021513 650_7 $$00$$2NLM Chemicals$$aMetals, Heavy
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000021513 7001_ $$0P:(DE-Juel1)VDB5476$$aZhang, Y.$$b1$$uFZJ
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000021513 7001_ $$0P:(DE-Juel1)128713$$aOffenhäusser, A.$$b6$$uFZJ
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000021513 8567_ $$uhttp://dx.doi.org/10.1002/elps.201100626
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