Nam, Yun-Sik Noh, Kown-Chul Kim, Nak-Kyoon Lee, Yeonhee Park, Hee-Kyung Lee, Kang-Bong 2024-01-20T09:31:19Z 2024-01-20T09:31:19Z 2021-09-04 2014-07-01 0039-9140 https://pubs.kist.re.kr/handle/201004/126603 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 (A(790)/A(535)) 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 NO2- ions in aqueous samples. (C) 2014 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE BV NITRITE NITRATE SYSTEM CHROMATOGRAPHY NITROSAMINES NANOCRYSTALS WATER ASSAY SHAPE SIZE Sensitive and selective determination of NO2- ion in aqueous samples using modified gold nanoparticle as a colorimetric probe Article 10.1016/j.talanta.2014.02.030 1 TALANTA, v.125, pp.153 - 158 TALANTA 125 153 158 scie scopus 000336872200021 2-s2.0-84897084432 Chemistry, Analytical Chemistry Article NITRITE NITRATE SYSTEM CHROMATOGRAPHY NITROSAMINES NANOCRYSTALS WATER ASSAY SHAPE SIZE Nitrite ion Gold nanoparticle 1-(2-mercaptoethyl)-1, 3, 5-Triazinane-2, 4, 6-trione Colorimetric detection