A novel silver-doped poly (p-aminobenzene sulfonic acid) modified electrode was fabricated, of which the electrochemical behaviors were studied with H2O2as a probe. In pH 7.0 PBS, a sensitive reductive peak of H2O2was observed. The modified electrode is of potential in practice for analysis of H2O2in samples such as milk.
A novel application of carbon nanotubes (CNTs) in the field of chromogenic reactions for recognizing aminophenol isomers was described. Among the three of aminophenol isomers, only p-aminophenol could form the chromogenic system. Comparative experiments proved that the absorption of the complex increased by 23.9% in the presence of CNTs due to the presence of the intact conjugated system. A selective determination of p-aminophenol was obtained
A novel composite was firstly synthesized by compositing graphenes (G) and carbon nanotubes (CNTs) and then a new composite modified electrode (G/CNTs/GCE) was prepared by coating the resulting composite on the surface of the glassy carbon electrode (GCE). The composite modified electrode G/CNTs/GCE showed great electrochemical activities which were studied by sensitive determining the electrochemistry behaviors of uric acid (UA). It revealed when the concentration range of UA changed from 1×10-7 mol/L to 1×10-3 mol/L, the peak currents had linear relationship with the concentration of UA in the phosphate buffer solution (PBS) which the value of pH is 7.0. And the linear equation is ip (μA) = 21.55C+28.94 (C: mmol/L), with the related coefficient 0.9964.
According to the color development reaction between starch/iodine reagent and products which obtained by fumigating melamine with chlorine, a method for determination of melamine in milk was put forward. The conditions of method were researched. The best conditions are as follows. Volume ratio of milk and extraction agent is 1:1. 5, dissolved with ultrasonic washer for 5 minutes, centrifugal separation 4000r/min for 5 minutes, extracted by C008 cation exchange resin column. The results are as follows: detection limit is 10mg/L, the linear range is 25-250 mg/L, related coefficient r is 0.994, coefficient of recovery is 94%-110%, and relatively standard deviation is 0.9%. This method is easy handling, cheap equipment, good practicability and recovery, can be used as low cost detection method.
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