The new combined method of the online liquid membrane enrichment flow injection of 4-amino-antipyrine(4-AAP) and spectrophotometric determination of volatile phenols in water has been developed.A flow carrier,tributyl...The new combined method of the online liquid membrane enrichment flow injection of 4-amino-antipyrine(4-AAP) and spectrophotometric determination of volatile phenols in water has been developed.A flow carrier,tributyl phosphate(TBP) dissolved in kerosene,was used in the liquid membrane extraction system.Experiment conditions were optimized.Under optimal conditions,the detection limit for volatile phenols is 0.5 μg/L and the linear range of the determination is 1mg/L～100μg/L.The method has been applied to the determination of volatile Phenols in tap,river and industrial waste water with satisfactory results.展开更多
Based on the principle of the reaction of NO2-with I-and formation of I2 in HCl solution,and the chemiluminescence(CL) reaction between luminol and I2 in an alkaline medium.A fairly sensitive,simple and rapid flow-inj...Based on the principle of the reaction of NO2-with I-and formation of I2 in HCl solution,and the chemiluminescence(CL) reaction between luminol and I2 in an alkaline medium.A fairly sensitive,simple and rapid flow-injection analysis-chemiluminescence method for the determina-tion of trace nitrite with the luminal-I——NO2-coupling luminescence system has been developed.Experiment conditions of flow-injection analysis are optimized.When satisfying the condition that Luminol as 4.0×10-4 mol/L,0.7 % KI,0.04 mol/L HCl;the length of reaction coil as 250 cm;the velocity of primary pump as 10r/min;the velocity of ancillary pump as 20 r/min.Under optimum conditions,the detection limit for NO2-is 0.5 μg/L,the linear range of the determination is 1.0～100.0 μg/L.The method can be applied to determination of trace NO2-in environmental water and green stuff with satisfactory results.展开更多
In the present method a new,simple and rapid spectophotometric FI technique for the accurate and determination of Cd(Ⅱ) in waste water has been developed.The method is based on the decrease of absorbance intensity of...In the present method a new,simple and rapid spectophotometric FI technique for the accurate and determination of Cd(Ⅱ) in waste water has been developed.The method is based on the decrease of absorbance intensity of iodide-butylrhodamine B(BRB+) due to the complexation with Cd(Ⅱ),which is found useful for sensitivity in arabin and OP-emulsion media.The absorption peak of the complexation,which is increased linearly by addition of Cd(Ⅱ),occurs at 608nm.Optimization of chemical and FI variables has been made. Under the optimized conditions,the calibration curve obtained were linear over the range 5μg/L^160μg/L,the detection limit was 2μg/L,and the precision(RSD=0.65%,n=10) was found quite satisfactory.Application of the method to the analysis of Cd(Ⅱ) in tap water,steam water added and waste water resulted a good agreement between the expected and found values.展开更多
文摘The new combined method of the online liquid membrane enrichment flow injection of 4-amino-antipyrine(4-AAP) and spectrophotometric determination of volatile phenols in water has been developed.A flow carrier,tributyl phosphate(TBP) dissolved in kerosene,was used in the liquid membrane extraction system.Experiment conditions were optimized.Under optimal conditions,the detection limit for volatile phenols is 0.5 μg/L and the linear range of the determination is 1mg/L～100μg/L.The method has been applied to the determination of volatile Phenols in tap,river and industrial waste water with satisfactory results.
文摘Based on the principle of the reaction of NO2-with I-and formation of I2 in HCl solution,and the chemiluminescence(CL) reaction between luminol and I2 in an alkaline medium.A fairly sensitive,simple and rapid flow-injection analysis-chemiluminescence method for the determina-tion of trace nitrite with the luminal-I——NO2-coupling luminescence system has been developed.Experiment conditions of flow-injection analysis are optimized.When satisfying the condition that Luminol as 4.0×10-4 mol/L,0.7 % KI,0.04 mol/L HCl;the length of reaction coil as 250 cm;the velocity of primary pump as 10r/min;the velocity of ancillary pump as 20 r/min.Under optimum conditions,the detection limit for NO2-is 0.5 μg/L,the linear range of the determination is 1.0～100.0 μg/L.The method can be applied to determination of trace NO2-in environmental water and green stuff with satisfactory results.
文摘In the present method a new,simple and rapid spectophotometric FI technique for the accurate and determination of Cd(Ⅱ) in waste water has been developed.The method is based on the decrease of absorbance intensity of iodide-butylrhodamine B(BRB+) due to the complexation with Cd(Ⅱ),which is found useful for sensitivity in arabin and OP-emulsion media.The absorption peak of the complexation,which is increased linearly by addition of Cd(Ⅱ),occurs at 608nm.Optimization of chemical and FI variables has been made. Under the optimized conditions,the calibration curve obtained were linear over the range 5μg/L^160μg/L,the detection limit was 2μg/L,and the precision(RSD=0.65%,n=10) was found quite satisfactory.Application of the method to the analysis of Cd(Ⅱ) in tap water,steam water added and waste water resulted a good agreement between the expected and found values.
