TY - JOUR
T1 - Chemiluminescence study of carbonate and peroxynitrous acid and its application to the direct determination of nitrite based on solid surface enhancement
AU - Lu, Chao
AU - Lin, Jin Ming
AU - Huie, Carmen W.
AU - Yamada, Masaaki
N1 - Funding Information:
Financial support from National Science Fund for Distinguished Young Scholars of China (No. 20125514) and from National High Technology Research and Development Program of China (863 Program) (No. 2001AA635030) is gratefully acknowledged.
PY - 2004/5/10
Y1 - 2004/5/10
N2 - Peroxynitrous acid (ONOOH) was produced by the on-line mixing of acidified hydrogen peroxide with nitrite in a flow system. A strong chemiluminescent (CL) emission was observed when ONOOH reacted with carbonate without any special CL reagents. When cotton was present in the CL cell, the CL emission was enhanced significantly. The method was developed to determine nitrite, which showed a key improvement that any CL reagents and sensitizers were not used, resulting in better selectivity. The applicability of the present CL system was demonstrated for the sensitive and selective determination of nitrite in natural water samples without any special pretreatment. Good agreements were obtained for the determination of nitrite in tap and well waters between the present approach and a standard spectrophotometric method. The average precision was 4.6% (n=7) and detection limit (S/N=3) was 1.0×10-7 M. Based on the CL spectrum, UV spectra, and dissolved oxygen measurement, a possible CL mechanism was proposed. ONOOH was an unstable compound in acidic solution and could be quenched into peroxynitrite (ONOO-) in basic solution. ONOO - reacted with CO2 to produce ONOOCO2 -, which can rapidly decompose into·NO2 and·CO3- radicals. In the presence of H +,·CO3- radicals can protonate to bicarbonate radical (HCO3·). The recombination of HCO 3·radicals and decomposition can lead to light emission.
AB - Peroxynitrous acid (ONOOH) was produced by the on-line mixing of acidified hydrogen peroxide with nitrite in a flow system. A strong chemiluminescent (CL) emission was observed when ONOOH reacted with carbonate without any special CL reagents. When cotton was present in the CL cell, the CL emission was enhanced significantly. The method was developed to determine nitrite, which showed a key improvement that any CL reagents and sensitizers were not used, resulting in better selectivity. The applicability of the present CL system was demonstrated for the sensitive and selective determination of nitrite in natural water samples without any special pretreatment. Good agreements were obtained for the determination of nitrite in tap and well waters between the present approach and a standard spectrophotometric method. The average precision was 4.6% (n=7) and detection limit (S/N=3) was 1.0×10-7 M. Based on the CL spectrum, UV spectra, and dissolved oxygen measurement, a possible CL mechanism was proposed. ONOOH was an unstable compound in acidic solution and could be quenched into peroxynitrite (ONOO-) in basic solution. ONOO - reacted with CO2 to produce ONOOCO2 -, which can rapidly decompose into·NO2 and·CO3- radicals. In the presence of H +,·CO3- radicals can protonate to bicarbonate radical (HCO3·). The recombination of HCO 3·radicals and decomposition can lead to light emission.
KW - Chemiluminescence
KW - Natural water
KW - Nitrite
KW - Peroxynitrous acid
KW - Solid surface enhancement
UR - http://www.scopus.com/inward/record.url?scp=2942628061&partnerID=8YFLogxK
U2 - 10.1016/j.aca.2003.12.057
DO - 10.1016/j.aca.2003.12.057
M3 - Journal article
AN - SCOPUS:2942628061
SN - 0003-2670
VL - 510
SP - 29
EP - 34
JO - Analytica Chimica Acta
JF - Analytica Chimica Acta
IS - 1
ER -