A highly sensitive spectrophotometric method for determination of selenium(IV) has been developed.It has been based on Se(IV) oxidation of I - in a weak acid medium and formation of the 1∶1 ion associatin complex of ...A highly sensitive spectrophotometric method for determination of selenium(IV) has been developed.It has been based on Se(IV) oxidation of I - in a weak acid medium and formation of the 1∶1 ion associatin complex of I - with Butylrhodamine B in the presence of poly(vinyl alcohol).The wavelength of maximum absorbance of this complex was at 590nm,The molar absorptivity was 2.57 ×10 5L.mol -1 ·cm -1 and Beer’s law was obeyed in the concentration range of 40～500ng/mL.The detection limit was 40ng/mL.Interfering ions were eliminated by using thiohydroxy cotton so that the selectivity of this method was good.The color system was used to determine the microamounts of Se in the liver of dophine and huangqi.Satisfactory results were obtained.展开更多
In this paper,three component determination of compound tablets of aspirin in pH 6.5 buffer solution was successfully made by using partial least squares method(PLS)without any chemical separation.The C language is us...In this paper,three component determination of compound tablets of aspirin in pH 6.5 buffer solution was successfully made by using partial least squares method(PLS)without any chemical separation.The C language is used for programming.the results showed that the average recoveries and relative standard deviation of caffeine,penacetin and aspirin were 101.4%,1.63,98.78%,1.32,98.81%,2.37,respectively.The effects of wave length range,numbles of wavelength on the results were discussed.This method is simple,rapid and satisfactory results were obtained.展开更多
A highly sensitive method for the spectrophotometric determination of germanium with salicyflourone (SAF) in the presence of poly (vinyl alcohol), hexadecyltrimethylaxnmonium bromide has has been developed. In a mediu...A highly sensitive method for the spectrophotometric determination of germanium with salicyflourone (SAF) in the presence of poly (vinyl alcohol), hexadecyltrimethylaxnmonium bromide has has been developed. In a medium of 0. 01 6mol/L-0. 024mol/L hydrochloric old,germanium(IV) forms a red-purple complex with the above reagents. The wavelength of maximum absorbance of this complex was at 528urn,the molar absorptivity was 1. 85 × 105L. mol-1. cm-1 and Beer’s law was obeyed in the concentration range of 0-10ug/25mL. The method has been used for the determination of microamounts of Ge(IV) in plants with satisfactory results.展开更多
文摘A highly sensitive spectrophotometric method for determination of selenium(IV) has been developed.It has been based on Se(IV) oxidation of I - in a weak acid medium and formation of the 1∶1 ion associatin complex of I - with Butylrhodamine B in the presence of poly(vinyl alcohol).The wavelength of maximum absorbance of this complex was at 590nm,The molar absorptivity was 2.57 ×10 5L.mol -1 ·cm -1 and Beer’s law was obeyed in the concentration range of 40～500ng/mL.The detection limit was 40ng/mL.Interfering ions were eliminated by using thiohydroxy cotton so that the selectivity of this method was good.The color system was used to determine the microamounts of Se in the liver of dophine and huangqi.Satisfactory results were obtained.
文摘In this paper,three component determination of compound tablets of aspirin in pH 6.5 buffer solution was successfully made by using partial least squares method(PLS)without any chemical separation.The C language is used for programming.the results showed that the average recoveries and relative standard deviation of caffeine,penacetin and aspirin were 101.4%,1.63,98.78%,1.32,98.81%,2.37,respectively.The effects of wave length range,numbles of wavelength on the results were discussed.This method is simple,rapid and satisfactory results were obtained.
文摘A highly sensitive method for the spectrophotometric determination of germanium with salicyflourone (SAF) in the presence of poly (vinyl alcohol), hexadecyltrimethylaxnmonium bromide has has been developed. In a medium of 0. 01 6mol/L-0. 024mol/L hydrochloric old,germanium(IV) forms a red-purple complex with the above reagents. The wavelength of maximum absorbance of this complex was at 528urn,the molar absorptivity was 1. 85 × 105L. mol-1. cm-1 and Beer’s law was obeyed in the concentration range of 0-10ug/25mL. The method has been used for the determination of microamounts of Ge(IV) in plants with satisfactory results.
