The development of a simple,fast,and sensitive method for Se(Ⅳ)determination is detailed in the present work.Experimental conditions were optimized using differential pulse and square wave cathodic stripping voltamme...The development of a simple,fast,and sensitive method for Se(Ⅳ)determination is detailed in the present work.Experimental conditions were optimized using differential pulse and square wave cathodic stripping voltammetry.An ex-situ bismuth film was deposited on the surface of a glassy carbon electrode and used as the working electrode.An exhaustive study of potential interferents was performed.Cu(Ⅱ)interference is one of the most significant challenges in Se(Ⅳ)determination.By integrating acetonitrile in the supporting electrolyte,Cu(Ⅰ)was stabilized through complex formation,thereby preventing metallic copper deposition and copper selenide formation.Even with a 50-fold excess of Cu(Ⅱ),no interference was observed in the quantification of Se(Ⅳ).The proposed method was validated using two certifi ed reference materials(CRMs)and applied to the analysis of four water samples,three of which were spiked with Se(Ⅳ).Satisfactory results were obtained from the validation and water sample analysis.展开更多
A proper mixture of β-cyclodextrin and sodium dodecylsulfate in aqueous solution was found to show a synergistic enhancement of the fluorescence intensity of 4,5-benzopiaselenol. The determination of trace selenium c...A proper mixture of β-cyclodextrin and sodium dodecylsulfate in aqueous solution was found to show a synergistic enhancement of the fluorescence intensity of 4,5-benzopiaselenol. The determination of trace selenium can be carried out directly in aqueous solution.展开更多
基金support from ANID by Proyecto PAI N°77190012Proyecto FONDEQUIP EQM150101。
文摘The development of a simple,fast,and sensitive method for Se(Ⅳ)determination is detailed in the present work.Experimental conditions were optimized using differential pulse and square wave cathodic stripping voltammetry.An ex-situ bismuth film was deposited on the surface of a glassy carbon electrode and used as the working electrode.An exhaustive study of potential interferents was performed.Cu(Ⅱ)interference is one of the most significant challenges in Se(Ⅳ)determination.By integrating acetonitrile in the supporting electrolyte,Cu(Ⅰ)was stabilized through complex formation,thereby preventing metallic copper deposition and copper selenide formation.Even with a 50-fold excess of Cu(Ⅱ),no interference was observed in the quantification of Se(Ⅳ).The proposed method was validated using two certifi ed reference materials(CRMs)and applied to the analysis of four water samples,three of which were spiked with Se(Ⅳ).Satisfactory results were obtained from the validation and water sample analysis.
基金Project supported by the National Natural Science Foundation of China.
文摘A proper mixture of β-cyclodextrin and sodium dodecylsulfate in aqueous solution was found to show a synergistic enhancement of the fluorescence intensity of 4,5-benzopiaselenol. The determination of trace selenium can be carried out directly in aqueous solution.
