title: Determination of nitrite by sequential injection analysis of electrokinetic flow analysis system.
abstract: A new sequential injection analysis (SIA) method of an electrokinetic flow analysis (EKFA) system for the determination of nitrite-nitrogen is presented in this paper. The proposed system mainly consisted of an electroosmotic pump, two solenoid valves and a spectrophotometer etc. All the pump and valves were controlled by a personal computer automatically. The determination method of nitrite-nitrogen was based on the reaction among nitrite, sulfanilamide and naphthylethylenediamine to form a colored compound, which was measured at 540 nm. The linear calibration range of nitrite-nitrogen was 10-800 mug l(-1). The detection limit was 1 mug l(-1) (K=3, n=11). The analytical method can provide a throughput of 33 samples per h.
authors.affiliation: Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.
authors.forename: Yao-Qiang
authors.initials: YQ
authors.lastname: Zhao
authors.forename: You-Zhao
authors.initials: YZ
authors.lastname: He
authors.forename: Wu-Er
authors.initials: WE
authors.lastname: Gan
authors.forename: Li
authors.initials: L
authors.lastname: Yang