“…Several analytical methods have been reported for determining NAP including spectrophotometry [2,3], fluorometry [4,5], synchronous spectrometry [6], phosphorimetry [7], voltammetry [8,9], liquid chromatography [10,11], capillary electrophoresis [12], high performance liquid chromatography (HPLC) [13][14][15], and chemiluminescence (CL) [16][17][18][19][20]. Among the above methods, CL coupled with flow injection offers the advantages of equipment simplicity, high detection sensitivity, low background noise and good reproducibility.…”