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
An on chip spiral channel flow cell for flow injection chemiluminescent system was prepared. Microchannels were fabricated using standard photolithography, wet chemical etching and thermal bonding techniques. Due to t...An on chip spiral channel flow cell for flow injection chemiluminescent system was prepared. Microchannels were fabricated using standard photolithography, wet chemical etching and thermal bonding techniques. Due to the long spiral channel on the chip and the oblate trapezoid cross section, there was enough time for the chemiluminescent reagents and sample to mix and react completely. The light produced can be easy to be recorded. The present on chip flow cell was used for the determination of some organic pollutants with peroxomonosulfate cobalt(Ⅱ)chemiluminescent system and mangnese(Ⅱ)with periodate carbonate chemiluminescent system. The detection limits for humic acid, 2 naphthol, benzo thiazole and mangnese(Ⅱ)are 3 0×10 -7 g·g -1 , 2 0×10 -6 mol·l -1 and 5 0×10 -7 mol·l -1 using peroxomonosulfate cobalt(Ⅱ)chemiluminescent system, and 5 0×10 -9 mol·l -1 using periodate carbo nate chemiluminescent system(S/N=3), respectively. The application of this flow cell to determine manganese(Ⅱ)in well water is also carried. The results are satisfactory.展开更多
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.
文摘An on chip spiral channel flow cell for flow injection chemiluminescent system was prepared. Microchannels were fabricated using standard photolithography, wet chemical etching and thermal bonding techniques. Due to the long spiral channel on the chip and the oblate trapezoid cross section, there was enough time for the chemiluminescent reagents and sample to mix and react completely. The light produced can be easy to be recorded. The present on chip flow cell was used for the determination of some organic pollutants with peroxomonosulfate cobalt(Ⅱ)chemiluminescent system and mangnese(Ⅱ)with periodate carbonate chemiluminescent system. The detection limits for humic acid, 2 naphthol, benzo thiazole and mangnese(Ⅱ)are 3 0×10 -7 g·g -1 , 2 0×10 -6 mol·l -1 and 5 0×10 -7 mol·l -1 using peroxomonosulfate cobalt(Ⅱ)chemiluminescent system, and 5 0×10 -9 mol·l -1 using periodate carbo nate chemiluminescent system(S/N=3), respectively. The application of this flow cell to determine manganese(Ⅱ)in well water is also carried. The results are satisfactory.
