A method for fast determination of the component in complex samples by using gas chromatography-mass spectrometry （GC-MS） was developed and used for quantitative analysis of phenanthrene in soils. In the method, win...A method for fast determination of the component in complex samples by using gas chromatography-mass spectrometry （GC-MS） was developed and used for quantitative analysis of phenanthrene in soils. In the method, window independent component analysis （WICA） was used for resolving the mass spectrum and non-negative im- mune algorithm （NNIA） was employed for obtaining the chromatographic profile. Therefore, spectral and chroma- tographic information of a specific component can be obtained from the measured GC-MS data of overlapping and high background. Six soil samples collected from different places were analyzed. The tedious pretreatments in pre- paring the samples and the elution in the separation were simplified for speeding up the analysis. Due to the com- plexity of the matrix, standard addition method was adopted for the final quantification. The applicability of the method was validated with a spiked sample and the results of the six samples are reasonable.展开更多
A An analytical method using high resolution inductively coupled plasma mass spectrometry （HR-ICP-MS） for rapid simultaneous determination of 24 elements （Be, Mg, A1, Ti, V, Cr, Mn, Fe, Ni, Cu, Zn, Ga, Ge, As, Se, ...A An analytical method using high resolution inductively coupled plasma mass spectrometry （HR-ICP-MS） for rapid simultaneous determination of 24 elements （Be, Mg, A1, Ti, V, Cr, Mn, Fe, Ni, Cu, Zn, Ga, Ge, As, Se, Mo, Ag, Cd, Sn Sb, Ba, Pt, Au, and Pb） in high purity cobalt was described. Sample digestions were performed in closed microwave vessels using HNO3 and HCI. The matrix effects because of the presence of excess HCI and Co were evaluated. The usefulness of high mass resolution for overcoming some spectral interference was demonstrated. The optimum conditions for the determination were tested and discussed. The standard addition method was employed for quantitative analysis. The detection limits were 0.016-1.50 ].tg·g^-1, the recovery ratios were 92.2%-111.2%, and the RSD was less than 3.6%. The method was accurate, quick, and convenient. It was applied to the determination of trace impurities in high purity cobalt with satisfactory results.展开更多
Sulfur speciation and concentration in geothermal water are of great significance for the research and utilization of the water resources.In most situations,it is necessary to determine the total sulfur in geothermal ...Sulfur speciation and concentration in geothermal water are of great significance for the research and utilization of the water resources.In most situations,it is necessary to determine the total sulfur in geothermal water.In this study,the method was established for the determination of determining total sulfur content-the inductively coupled plasma-atomic emission spectrometry(ICP-AES),with the wavelength of 182.034 nm selected in spectral line of sulfur.It was identified that the optimal working conditions of the ICP-AES instrument were 1200 W for high frequency generator power 9 mm for vertical observation height,0.30 MPa atomizer pressure,and 50 r/min analytical pump speed.The matrix interference of the method was eliminated by the matrix matching method.Using this method,sulfur detection limit and minimum quantitative detection limit were 0.028 mg/L and 0.110 mg/L,respectively,whilst the linear range was 0.0-100.0 mg/L.The recovery rate of sample was between 90.67%and 108.7%,and the relative standard deviation(RSD)was between 0.36%and 2.14%.The method was used to analyze the actual samples and the results were basically consistent with the industry standard method.With high analysis efficiency,the method has low detection limit and minimum quantitative detection limit,wide linear range,good precision and accuracy,and provides an important detection method for the determination of total sulfur in geothermal water.展开更多
Novel functionalized Arabic gums(AGs)were obtained by oxidation and acylation reactions on raw Arabic gum.The synthesized materials were used as modifiers of carbon paste electrodes for the determination of quercetin(...Novel functionalized Arabic gums(AGs)were obtained by oxidation and acylation reactions on raw Arabic gum.The synthesized materials were used as modifiers of carbon paste electrodes for the determination of quercetin(QCT),rutin(RUT)and both p-aminophenol(PAP)and acetaminophen(APAP)in 0.1 M phosphate buffer solution(PBS),pH 6.0.The identification of chemical functions on the surfaces of raw material was determined using Fourier transform infrared spectroscopy(FT-IR).Cyclic voltammetry and square wave voltammetry were used for the electrochemical study of QCT,RUT,PAP and APAP on modified electrodes.Electrochemical signals increased when the electrode was first modified with acylated gum in comparison to the unmodified electrode,and the signals became more important with the oxidized gum.Using oxidized AG modified carbon paste electrode(OAG-CPE),the linear range of the determination for both QCT and RUT was 0.020-0.090 mg/L,and from 1 to 9 mg/L for both PAP and APAP.Limits of detection were found to be 0.005,0.023,0.039 and 0.105 mg/L for QCT,RUT,PAP and APAP respectively.This sensor was first used for the direct quantification of APAP in commercialized tablets of DolipraneR 500 with a recovery of 94.3%,and secondly,for a simultaneous detection of both QCT and RUT in human urine.展开更多
文摘A method for fast determination of the component in complex samples by using gas chromatography-mass spectrometry （GC-MS） was developed and used for quantitative analysis of phenanthrene in soils. In the method, window independent component analysis （WICA） was used for resolving the mass spectrum and non-negative im- mune algorithm （NNIA） was employed for obtaining the chromatographic profile. Therefore, spectral and chroma- tographic information of a specific component can be obtained from the measured GC-MS data of overlapping and high background. Six soil samples collected from different places were analyzed. The tedious pretreatments in pre- paring the samples and the elution in the separation were simplified for speeding up the analysis. Due to the com- plexity of the matrix, standard addition method was adopted for the final quantification. The applicability of the method was validated with a spiked sample and the results of the six samples are reasonable.
基金the Natural Science Foundation of Hunan Province, China (No. 05JJ40017).
文摘A An analytical method using high resolution inductively coupled plasma mass spectrometry （HR-ICP-MS） for rapid simultaneous determination of 24 elements （Be, Mg, A1, Ti, V, Cr, Mn, Fe, Ni, Cu, Zn, Ga, Ge, As, Se, Mo, Ag, Cd, Sn Sb, Ba, Pt, Au, and Pb） in high purity cobalt was described. Sample digestions were performed in closed microwave vessels using HNO3 and HCI. The matrix effects because of the presence of excess HCI and Co were evaluated. The usefulness of high mass resolution for overcoming some spectral interference was demonstrated. The optimum conditions for the determination were tested and discussed. The standard addition method was employed for quantitative analysis. The detection limits were 0.016-1.50 ].tg·g^-1, the recovery ratios were 92.2%-111.2%, and the RSD was less than 3.6%. The method was accurate, quick, and convenient. It was applied to the determination of trace impurities in high purity cobalt with satisfactory results.
基金supported by the Fundamental Research Fund Project(SK201908)of the Institute of Hydrogeology and Environmental Geology,Chinese Academy of Geological Sciences.
文摘Sulfur speciation and concentration in geothermal water are of great significance for the research and utilization of the water resources.In most situations,it is necessary to determine the total sulfur in geothermal water.In this study,the method was established for the determination of determining total sulfur content-the inductively coupled plasma-atomic emission spectrometry(ICP-AES),with the wavelength of 182.034 nm selected in spectral line of sulfur.It was identified that the optimal working conditions of the ICP-AES instrument were 1200 W for high frequency generator power 9 mm for vertical observation height,0.30 MPa atomizer pressure,and 50 r/min analytical pump speed.The matrix interference of the method was eliminated by the matrix matching method.Using this method,sulfur detection limit and minimum quantitative detection limit were 0.028 mg/L and 0.110 mg/L,respectively,whilst the linear range was 0.0-100.0 mg/L.The recovery rate of sample was between 90.67%and 108.7%,and the relative standard deviation(RSD)was between 0.36%and 2.14%.The method was used to analyze the actual samples and the results were basically consistent with the industry standard method.With high analysis efficiency,the method has low detection limit and minimum quantitative detection limit,wide linear range,good precision and accuracy,and provides an important detection method for the determination of total sulfur in geothermal water.
基金thank the International Science Program(ISP)for financial supportthank Dr.Tchieno MMF for recording FT-IR spectra.
文摘Novel functionalized Arabic gums(AGs)were obtained by oxidation and acylation reactions on raw Arabic gum.The synthesized materials were used as modifiers of carbon paste electrodes for the determination of quercetin(QCT),rutin(RUT)and both p-aminophenol(PAP)and acetaminophen(APAP)in 0.1 M phosphate buffer solution(PBS),pH 6.0.The identification of chemical functions on the surfaces of raw material was determined using Fourier transform infrared spectroscopy(FT-IR).Cyclic voltammetry and square wave voltammetry were used for the electrochemical study of QCT,RUT,PAP and APAP on modified electrodes.Electrochemical signals increased when the electrode was first modified with acylated gum in comparison to the unmodified electrode,and the signals became more important with the oxidized gum.Using oxidized AG modified carbon paste electrode(OAG-CPE),the linear range of the determination for both QCT and RUT was 0.020-0.090 mg/L,and from 1 to 9 mg/L for both PAP and APAP.Limits of detection were found to be 0.005,0.023,0.039 and 0.105 mg/L for QCT,RUT,PAP and APAP respectively.This sensor was first used for the direct quantification of APAP in commercialized tablets of DolipraneR 500 with a recovery of 94.3%,and secondly,for a simultaneous detection of both QCT and RUT in human urine.
