A new stationary phase for iodide ion analysis has been developed. The cationic polymerepichlorohydrin-dimethylamine（PEPI-DMA） was served as modifier in synthesizing polyelectrolyte sorbents and the macroporous poly...A new stationary phase for iodide ion analysis has been developed. The cationic polymerepichlorohydrin-dimethylamine（PEPI-DMA） was served as modifier in synthesizing polyelectrolyte sorbents and the macroporous polystyrene-divinylbenzene（PS-DVB） resin was used as support. The positively charged polymer（PEPI-DMA） was electrostatically bonded to a negatively charged particle（PS-DVB sulfonated）. The new stationary phase was characterized by scanning electron microscopy（SEM）, Fourier transform infrared（FTIR）, elemental analysis, chemical adsorption and desorption measurements. The chromatographic evaluation of the new stationary phase was performed using various anions with a conductivity detector. The new stationary phase was also applied to the determination of iodide directly with a DC amperometric detector using a platinum working electrode and an Ag/Ag Cl reference electrode. The chromatographic conditions were optimized and the eluent solution contained 5 mmol/L HNO3 and 15 mmol/L Na NO3 at a flow rate of 1.0 m L/min and column temperature of 30 8C. The applied voltage of the DC amperometric detector was 0.9 V. Under the optimum conditions, the linear range of the method was 0.2–50 mg/L for iodide ion with a correlation coefficient of 0.9990. The detection limit was 0.05 mg/L（calculated at S/N = 3） and the relative standard deviations（RSD, n = 6） were all less than 1% for retention time, peak area and peak height. This method was also utilized for the determination of iodide ions in samples of povidone iodine solution and kelp samples with satisfactory results.展开更多
In this paper,a simple method based on ion chromatography（IC） with conductivity detection was developed for the determination of iminodiacetic acid（IDA） in the herbicide of glyphosate.Under optimized chromatograph...In this paper,a simple method based on ion chromatography（IC） with conductivity detection was developed for the determination of iminodiacetic acid（IDA） in the herbicide of glyphosate.Under optimized chromatographic conditions,good linear relationship,sensitivity and reproducibility were obtained.The detection limit（LOD） for IDA obtained by injecting 25 μL of sample was 31.8 μg/L（S/N = 3）.Relative standard deviation（RSD） of repeated analysis for the peak areas was less than 1.53%（n = 6）.A spiking study was performed with satisfactory recoveries between 92.8%and 103.6%.It was confirmed that this method could be applied in glyphosate products.展开更多
基金financially supported by Natural Science Foundation of Zhejiang Province(Nos.Y4110532,LQ13B050001,LY12B05003)Professional Development Program for Visiting Scholars from Colleges and Universities in Zhejiang Province(No.FX2013148)+1 种基金Major National Scientific Instrument and Equipment Development Special of China(No.2012YQ09022903)Key Laboratory of Health Risk Appraisal for Trace Toxic Chemicals of Zhejiang Province
文摘A new stationary phase for iodide ion analysis has been developed. The cationic polymerepichlorohydrin-dimethylamine（PEPI-DMA） was served as modifier in synthesizing polyelectrolyte sorbents and the macroporous polystyrene-divinylbenzene（PS-DVB） resin was used as support. The positively charged polymer（PEPI-DMA） was electrostatically bonded to a negatively charged particle（PS-DVB sulfonated）. The new stationary phase was characterized by scanning electron microscopy（SEM）, Fourier transform infrared（FTIR）, elemental analysis, chemical adsorption and desorption measurements. The chromatographic evaluation of the new stationary phase was performed using various anions with a conductivity detector. The new stationary phase was also applied to the determination of iodide directly with a DC amperometric detector using a platinum working electrode and an Ag/Ag Cl reference electrode. The chromatographic conditions were optimized and the eluent solution contained 5 mmol/L HNO3 and 15 mmol/L Na NO3 at a flow rate of 1.0 m L/min and column temperature of 30 8C. The applied voltage of the DC amperometric detector was 0.9 V. Under the optimum conditions, the linear range of the method was 0.2–50 mg/L for iodide ion with a correlation coefficient of 0.9990. The detection limit was 0.05 mg/L（calculated at S/N = 3） and the relative standard deviations（RSD, n = 6） were all less than 1% for retention time, peak area and peak height. This method was also utilized for the determination of iodide ions in samples of povidone iodine solution and kelp samples with satisfactory results.
基金supported by the National Important Project on Science Instrument(No.2012YQ09022903)Zhejiang Provincial Natural Science Foundation of China(No. Y4110532)Zhejiang Provincial Assay Foundation of China (No.2012C37038)
文摘In this paper,a simple method based on ion chromatography（IC） with conductivity detection was developed for the determination of iminodiacetic acid（IDA） in the herbicide of glyphosate.Under optimized chromatographic conditions,good linear relationship,sensitivity and reproducibility were obtained.The detection limit（LOD） for IDA obtained by injecting 25 μL of sample was 31.8 μg/L（S/N = 3）.Relative standard deviation（RSD） of repeated analysis for the peak areas was less than 1.53%（n = 6）.A spiking study was performed with satisfactory recoveries between 92.8%and 103.6%.It was confirmed that this method could be applied in glyphosate products.
