Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10559529 | Talanta | 2011 | 6 Pages |
Abstract
The detection of nitroaromatic compounds, best known as raw materials in explosives preparations, is important in many fields including environmental science, public security and forensics. CdSe quantum dots capped with PAMAM-G4 dendrimer were synthetized in water and used for the detection of trace amounts of three nitroaromatic compounds: 4-methoxy-2-nitrophenol (MNP), 2-amine-5-chloro-1,3-dinitrobenzene (ACNB) and 3-methoxy-4-nitrobenzoic acid (MNB). To increase the apparent water solubility of these compounds α-cyclodextrin (α-CD) was used to promote the formation of inclusion complexes. The studied nitroaromatic compounds (plus α-CD) significantly quenched the fluorescence intensity of the nanocomposite with linear Stern-Volmer plots. The Stern-Volmer constants (standard deviation in parenthesis) were: MNB, KSV = 65(5) Ã 104 Mâ1; ACNB, KSV = 19(2) Ã 104 Mâ1; and, MNP, KSV = 33(1) Ã 102 Mâ1. These constants suggest the formation of a ground state complex between the nitroaromatric compounds and the sensor which confers a relatively high analytical sensitivity. The detection sensibilities are about 0.01 mg Lâ1 for MNB and ACNB and about 0.1 mg Lâ1 for MNP. No interferences or small interferences are observed for trinitrotoluene [KSV = 10(2) Ã 102 Ã Mâ1], 2,4-dinitrotoluene [KSV = 20(3) Ã 10 Mâ1], 2,6-dinitrotoluene [KSV = 11(4) Ã 10 Mâ1] and nitrobenzene [KSV = 2(1) Ã 103 Ã Mâ1].
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
M. Algarra, B.B. Campos, M.S. Miranda, Joaquim C.G. Esteves da Silva,