Sensitive and selective determination of NO(2)(-) ion in aqueous samples using modified gold nanoparticle as a colorimetric probe.
A sensitive and selective colorimetric method for determination of nitrite ion in aqueous samples was developed using 1-(2-mercaptoethyl)-1, 3, 5-triazinane-2, 4, 6-trione-functionalized gold nanoparticles (MTT-GNPs). The nitrite ion seems to be used as a "molecular bridge", which can form NH---N and NH---O hydrogen bonds with the MTT-GNPs, shorten the interparticle distance, and induce the aggregation of the MTT-GNPs. This aggregation results in a dramatic change from wine-red to purple-gray color. Therefore, the concentration of nitrite ion in environmental samples can be quantitatively detected using the MTT-GNPs sensor by the naked eyes or UV-vis spectrometer. Moreover, investigations have revealed the sensitivity of the detection could be clearly improved by modulating pH of the solution, which led to a more rapid color change in the optimized GNPs system. The absorption ratios (A790/A535) of the modified GNPs solution exhibited a linear correlation with nitrite ion concentrations and the limit of detection was 1 ppm. This cost effective sensing system allows for the rapid and facile determination of the concentration of [Formula: see text] ions in aqueous samples.
Advanced Analysis Center, Korea Institute of Science and Technology, P.O. Box 131, Cheongryangri, Seoul 130-650, Republic of Korea.
Yun-Sik
YS
Nam
Advanced Analysis Center, Korea Institute of Science and Technology, P.O. Box 131, Cheongryangri, Seoul 130-650, Republic of Korea.
Kown-Chul
KC
Noh
Advanced Analysis Center, Korea Institute of Science and Technology, P.O. Box 131, Cheongryangri, Seoul 130-650, Republic of Korea.
Nak-Kyoon
NK
Kim
Advanced Analysis Center, Korea Institute of Science and Technology, P.O. Box 131, Cheongryangri, Seoul 130-650, Republic of Korea.
Yeonhee
Y
Lee
Department of Oral Medicine and Oral Diagnosis, School of Dentistry, Seoul National University, 101 Daehak-ro Jongro-gu, Seoul 110-774, Republic of Korea.
Hee-Kyung
HK
Park
Advanced Analysis Center, Korea Institute of Science and Technology, P.O. Box 131, Cheongryangri, Seoul 130-650, Republic of Korea. Electronic address: leekb@kist.re.kr.
Kang-Bong
KB
Lee
D000838:Anions; D015374:Biosensing Techniques; D003116:Color; D003124:Colorimetry; D006046:Gold / Q000737:chemistry*; D007477:Ions; D053768:Metal Nanoparticles / Q000737:chemistry*; D009585:Nitrogen Dioxide / Q000032:analysis* / Q000737:chemistry; D010316:Particle Size; D015203:Reproducibility of Results; D013056:Spectrophotometry, Ultraviolet; D013778:Tetrazolium Salts / Q000032:analysis; D013844:Thiazoles / Q000032:analysis; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*
D000838:Anions; D007477:Ions; D013778:Tetrazolium Salts; D013844:Thiazoles; D014874:Water Pollutants, Chemical; D014867:Water; D006046:Gold; C022616:thiazolyl blue; D009585:Nitrogen Dioxide
1-(2-mercaptoethyl)-1, 3, 5-Triazinane-2, 4, 6-trione; Colorimetric detection; Gold nanoparticle; Nitrite ion