用于高效液相色谱电化学检测器的新型碳纤维电极研究

STUDIES ON NEW CARBON FIBER ELECTRODES AS WORKING ELECTRODE IN ELECTROCHEMICAL DETECTOR FOR HPLC

可用于高效液相色谱（ＨＰＬＣ）电化学检测器的碳纤维电极，受流速影响小，在流通体系中响应快，重现性好，灵敏度高。以它作为工作电极的检测器，用于流动注射安培法时，对３，４一二羟基苯甲胺氢溴酸盐（ＤＨＢＡ），其线性范围为０．２～１６０ｎｇ，比一般流通体系检测器提高约３～４个数量级，灵敏度亦较常用的检测器高，检测限对于ＤＨＢＡ可达０．０７ｎｇ。

New Carbon fiber electrodex hare recently hcem designed 、made and evaluated. Viscose fber elec-trode the best of its kind,electrode was used as working electrode in electrochemical detectorcombined with HPLC. Results evaluated show that the new electrode is independent of folwrate and has high sensibility in flow system Detector with viscose fiber electrode as the workingelectrode was mocd to determine 3,4-dihydroxy -benzyamine hydrobromide(DHBA)with flowinjection amperoetric detection,the response keing linear over the tset range of 0.2ng-160gn,detection limits for DHBA heing 0.07gn The sensibility of this electrode is higher by 3-4 or-der of magnitude than other detectors usually used in jlow system.