Model DF-1 electrochemical analyzer is a many-purpose electrochemical instrumentation with following five functional select switches for operating conditions: cathodic /anodie polarization; single/cycle sean；two/thre...Model DF-1 electrochemical analyzer is a many-purpose electrochemical instrumentation with following five functional select switches for operating conditions: cathodic /anodie polarization; single/cycle sean；two/three electrodes system；direct/derivative output；normal/differential mode. Consequently they can be combined into several working manners, result in different experimental methods as consistent with desire. This instrument has manifold compensator and adjuster with a wide-range, so that the sensitivity and the signal graph have been able to improve. In addition, the instrument incorporates a strip-chart recorder and an exact timer. It is also equipped with electrochemical bench and a set of electrodes including the rotating glassy carbon electrode, gold plate electrode, silver plate electrode, mercury coated silver base electrode, hanging mercury electrode etc. In order to broaden the field of its application, all units of the instrument can be unitized, but each and every can be also used independently. The instrument is applicable to polarography, voltammetry, potentiometric stripping, potentiostatic electrolysis,differential technique, coulometry, linear polarization method, cycle voltammetry, passivation curve, and some other electrochemical technique, which have need for electrochemical cell with two, three，or four electrodes. This paper describes the design fundament, feature and specification of the electrochemical analyzer, and finally gives laboratory application some experimental examples.展开更多
The applicability of a gold nanoparticle-modified glassy carbon sensor （AuNPs-GCS） for the determination of inorganic mercury in fresh and canned tuna fish by square wave anodic stripping voltammetry （SW-ASV） is d...The applicability of a gold nanoparticle-modified glassy carbon sensor （AuNPs-GCS） for the determination of inorganic mercury in fresh and canned tuna fish by square wave anodic stripping voltammetry （SW-ASV） is demonstrated. Mercury content in sample Tuna Fish ISPRA T22 was determined to value the accuracy of the determination. The concentration in this sample is not certified, so, the Hg amount was determined also with atomic absorption spectroscopy （AAS）： the results obtained with ASV were in good agreement and confirmed literature value reported for this sample. Then, real samples of tuna fish were analyzed. The voltammetric analyses were performed using previously optimized conditions （deposition potential 0 V, step potential 0.004 V, frequency 150 Hz and amplitude 0.003 V）. Medium exchange technique permitted to eliminate possible matrix effects. The concentrations in the real samples were found to be in agreement with the common Hg levels reported in literature for commercialized tuna fish in different countries.展开更多
文摘Model DF-1 electrochemical analyzer is a many-purpose electrochemical instrumentation with following five functional select switches for operating conditions: cathodic /anodie polarization; single/cycle sean；two/three electrodes system；direct/derivative output；normal/differential mode. Consequently they can be combined into several working manners, result in different experimental methods as consistent with desire. This instrument has manifold compensator and adjuster with a wide-range, so that the sensitivity and the signal graph have been able to improve. In addition, the instrument incorporates a strip-chart recorder and an exact timer. It is also equipped with electrochemical bench and a set of electrodes including the rotating glassy carbon electrode, gold plate electrode, silver plate electrode, mercury coated silver base electrode, hanging mercury electrode etc. In order to broaden the field of its application, all units of the instrument can be unitized, but each and every can be also used independently. The instrument is applicable to polarography, voltammetry, potentiometric stripping, potentiostatic electrolysis,differential technique, coulometry, linear polarization method, cycle voltammetry, passivation curve, and some other electrochemical technique, which have need for electrochemical cell with two, three，or four electrodes. This paper describes the design fundament, feature and specification of the electrochemical analyzer, and finally gives laboratory application some experimental examples.
文摘The applicability of a gold nanoparticle-modified glassy carbon sensor （AuNPs-GCS） for the determination of inorganic mercury in fresh and canned tuna fish by square wave anodic stripping voltammetry （SW-ASV） is demonstrated. Mercury content in sample Tuna Fish ISPRA T22 was determined to value the accuracy of the determination. The concentration in this sample is not certified, so, the Hg amount was determined also with atomic absorption spectroscopy （AAS）： the results obtained with ASV were in good agreement and confirmed literature value reported for this sample. Then, real samples of tuna fish were analyzed. The voltammetric analyses were performed using previously optimized conditions （deposition potential 0 V, step potential 0.004 V, frequency 150 Hz and amplitude 0.003 V）. Medium exchange technique permitted to eliminate possible matrix effects. The concentrations in the real samples were found to be in agreement with the common Hg levels reported in literature for commercialized tuna fish in different countries.
