A novel chemiluminescence .Cl sensor combined with flow-injectionanalysis nas been developed for determining free chlorine in tap water. Takeanalytical reagent luminol was immobilied on an anion exchange res in column...A novel chemiluminescence .Cl sensor combined with flow-injectionanalysis nas been developed for determining free chlorine in tap water. Takeanalytical reagent luminol was immobilied on an anion exchange res in column.Will ie a volume of the sodium hydroxide passed the column, luminol was elutedfrom the res in in a Ika I me aqueous solut ion and then mixed wi th the samples tream to react and produce CI. The CI emiss ion miens ity was correlated￣ ￣8 ￣' u.i th the standard C10 concentration in the lange of I x 10 to 4 x 10 g ml, andthe detect ion I imi t was & x 10-' g .l-' C10--. Interfering metal ions plesent inwa ter wele effect ively separated by a pre-colunm ca t ion exchanger. A completeana lys is, including sampl lug and washing, could be performed in 1 min wi tha relative standald deviation of less than 5%. The sensor was stable for over 200t imes and has been appl led successfully to the determination of C10 in tapwa t e i.展开更多
A flow injection chemiluminescence (CL) method for the determination of catecholamines is described which is based on their inhibition of the intensity of CL from the luminol-hypochlorite system The hypochlorite was e...A flow injection chemiluminescence (CL) method for the determination of catecholamines is described which is based on their inhibition of the intensity of CL from the luminol-hypochlorite system The hypochlorite was electrogenerated on-line by a constant current electrolysis, resulting in the elimination of the instability of the hypochlorite solution prepared from a commercial reagent of sodium hypochlorite. The detection limits are 0.6 ng/ml for dopamine, 0.8 ng/ml for adrenaline and isoprenaline. The proposed method has been successfully applied to the determination of catecholamines in pharmaceutical injections.展开更多
A piecewise cubic curve fitting algorithm preserving monotonicity of the data without modification of the assigned slopes is proposed. The algorithm has the same order of convergence as Yan's algorithm[8] and Gasp...A piecewise cubic curve fitting algorithm preserving monotonicity of the data without modification of the assigned slopes is proposed. The algorithm has the same order of convergence as Yan's algorithm[8] and Gasparo-Morandi's algorithm[5] for accurate or 0(h(q)) accUrate given data, but it has a more visually pleasing curve than those two algorithms. We also discuss the convergence order of cubic rational interpolation for 0(h(q)) accurate data.展开更多
文摘A novel chemiluminescence .Cl sensor combined with flow-injectionanalysis nas been developed for determining free chlorine in tap water. Takeanalytical reagent luminol was immobilied on an anion exchange res in column.Will ie a volume of the sodium hydroxide passed the column, luminol was elutedfrom the res in in a Ika I me aqueous solut ion and then mixed wi th the samples tream to react and produce CI. The CI emiss ion miens ity was correlated￣ ￣8 ￣' u.i th the standard C10 concentration in the lange of I x 10 to 4 x 10 g ml, andthe detect ion I imi t was & x 10-' g .l-' C10--. Interfering metal ions plesent inwa ter wele effect ively separated by a pre-colunm ca t ion exchanger. A completeana lys is, including sampl lug and washing, could be performed in 1 min wi tha relative standald deviation of less than 5%. The sensor was stable for over 200t imes and has been appl led successfully to the determination of C10 in tapwa t e i.
文摘A flow injection chemiluminescence (CL) method for the determination of catecholamines is described which is based on their inhibition of the intensity of CL from the luminol-hypochlorite system The hypochlorite was electrogenerated on-line by a constant current electrolysis, resulting in the elimination of the instability of the hypochlorite solution prepared from a commercial reagent of sodium hypochlorite. The detection limits are 0.6 ng/ml for dopamine, 0.8 ng/ml for adrenaline and isoprenaline. The proposed method has been successfully applied to the determination of catecholamines in pharmaceutical injections.
基金The Project Supported by National Natural Science Foundation of China.
文摘A piecewise cubic curve fitting algorithm preserving monotonicity of the data without modification of the assigned slopes is proposed. The algorithm has the same order of convergence as Yan's algorithm[8] and Gasparo-Morandi's algorithm[5] for accurate or 0(h(q)) accUrate given data, but it has a more visually pleasing curve than those two algorithms. We also discuss the convergence order of cubic rational interpolation for 0(h(q)) accurate data.
