An ion chromatography（IC） system coupled with on-line column-switching technique was used to determine anions ofμg/g levels in organic chemicals of analytical reagent grade.A novel polystyrene-divinylbenzene-carbon...An ion chromatography（IC） system coupled with on-line column-switching technique was used to determine anions ofμg/g levels in organic chemicals of analytical reagent grade.A novel polystyrene-divinylbenzene-carbon nanotube（PS-DVB-CNT） stationary phase was utilized for matrix elimination.A calibration study was conducted by preparing and analyzing eight concentrations（between 10 and 5000μg/L） of eight standards in deionized water.The linearity was between 0.9978 and 1.And the detection limits ranged from 1.54μg/L to 10.02μg/L.A spiking study was performed on two representative organic chemicals.The recoveries were between 84.3%and 119.6%.展开更多
A column switching technique has been developed for the sequential determination of organic acids and cations in alcoholic drinks. An anion exchange column and a cation exchange column were connected in parallel fo...A column switching technique has been developed for the sequential determination of organic acids and cations in alcoholic drinks. An anion exchange column and a cation exchange column were connected in parallel for the measurement. Oxalic acid was employed as a common eluent for both the anion and cation exchange columns. Under the same chromatographic conditions, the organic acids and cations can be separated sequentially by a switching operation selecting the path way through the anion and cation exchange columns. This method is simple to operate and is very sensitive with detection limits of 0 1～ 1 0 mg/L for organic acids and 10～ 20 μg/L for cations.展开更多
基金supported by National Natural Science Foundation of China(Nos.20775070, J0830413)Zhejiang Provincial Natural Science Foundation of China(Nos.R4080124,Y4090104,Y4090078)Zhejiang Qianjiang Project of Science and Technology for Competent People(No.2008R10028)
文摘An ion chromatography（IC） system coupled with on-line column-switching technique was used to determine anions ofμg/g levels in organic chemicals of analytical reagent grade.A novel polystyrene-divinylbenzene-carbon nanotube（PS-DVB-CNT） stationary phase was utilized for matrix elimination.A calibration study was conducted by preparing and analyzing eight concentrations（between 10 and 5000μg/L） of eight standards in deionized water.The linearity was between 0.9978 and 1.And the detection limits ranged from 1.54μg/L to 10.02μg/L.A spiking study was performed on two representative organic chemicals.The recoveries were between 84.3%and 119.6%.
文摘A column switching technique has been developed for the sequential determination of organic acids and cations in alcoholic drinks. An anion exchange column and a cation exchange column were connected in parallel for the measurement. Oxalic acid was employed as a common eluent for both the anion and cation exchange columns. Under the same chromatographic conditions, the organic acids and cations can be separated sequentially by a switching operation selecting the path way through the anion and cation exchange columns. This method is simple to operate and is very sensitive with detection limits of 0 1～ 1 0 mg/L for organic acids and 10～ 20 μg/L for cations.
