A novel renewable liquid drop sensor was proposed for quantitative assay of thiamine based on it′s oxidation by Hg 2+ in basic medium. The dynamically growing and falling drops formed at the end of a silanized silica...A novel renewable liquid drop sensor was proposed for quantitative assay of thiamine based on it′s oxidation by Hg 2+ in basic medium. The dynamically growing and falling drops formed at the end of a silanized silica capillary tube served as the reactors for a chromogenic reaction and windowless optical cells as well. The optimum analytical conditions have been established. The sensor showed a linear response in the measuring range from 1.0×10 -4 to 5.0×10 -3 mg/mL thiamine, and with a detection limit of 8.0×10 -4 mg/mL. Besides its high sensitivity, the sensor permits a simple, fast, and inexpensive measurement with only micro-quantities reagent consumption.展开更多
Nickel phosphorous amorphous film catalyst was prepared by means of electrodeposition on p-type silicon. Effects of H3PO3 content in bath and current density on phosphorous content in the film were studied. With the i...Nickel phosphorous amorphous film catalyst was prepared by means of electrodeposition on p-type silicon. Effects of H3PO3 content in bath and current density on phosphorous content in the film were studied. With the increase of H3PO3 concentration and the decrease of current density, P content was increased remarkably, X-ray dtheaction (XRD) showed that the film containning x (molar fraction)=0.109 P is amorphous.Scanning electrouic microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) wereused to investigate the morphology of the film and the chemical state of Ni, P, O on thesurface.展开更多
文摘A novel renewable liquid drop sensor was proposed for quantitative assay of thiamine based on it′s oxidation by Hg 2+ in basic medium. The dynamically growing and falling drops formed at the end of a silanized silica capillary tube served as the reactors for a chromogenic reaction and windowless optical cells as well. The optimum analytical conditions have been established. The sensor showed a linear response in the measuring range from 1.0×10 -4 to 5.0×10 -3 mg/mL thiamine, and with a detection limit of 8.0×10 -4 mg/mL. Besides its high sensitivity, the sensor permits a simple, fast, and inexpensive measurement with only micro-quantities reagent consumption.
文摘Nickel phosphorous amorphous film catalyst was prepared by means of electrodeposition on p-type silicon. Effects of H3PO3 content in bath and current density on phosphorous content in the film were studied. With the increase of H3PO3 concentration and the decrease of current density, P content was increased remarkably, X-ray dtheaction (XRD) showed that the film containning x (molar fraction)=0.109 P is amorphous.Scanning electrouic microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) wereused to investigate the morphology of the film and the chemical state of Ni, P, O on thesurface.
