Voltammetric Detection of Nitrite Throught a Chemically Modified (5-Amino-1,3,4-Thiadiazolyl-2-Thiol) Propyl Silica Gel

Author(s)

Rizzato Nakamura, Ana Paula ^[1] ; Fernandes, Daniela Silvestrini ^{[2, 1]} ; Vieira, Eduardo Guimaraes ^[3] ; Dias Filho, Newton Luis ^[1] ; do Carmo, Devaney Ribeiro ^[1]

Affiliation

^[1] Univ Estadual Paulista, UNESP, Fac Engn Ilha Solteira, Dept Fis & Quim, Av Brasil 56, BR-15385000 Ilha Solteira, SP - Brazil

^[2] Univ Sao Paulo, Dept Quim, Fac Filosofia Ciencias & Letras Ribeirao Preto, Av Bandeirantes 3900, BR-14040901 Ribeirao Preto, SP - Brazil

^[3] Univ Sao Paulo, Dept Quim Fundamental, Inst Quim, Brazil Av Prof Lineu Prestes 748, BR-05508000 Sao Paulo, SP - Brazil

• Document type: Journal article
• Source: SILICON; v. 13, n. 1, p. 221-229, JAN 2021.
• Web of Science Citations: 0

Abstract

This study describes an organofunctionalization of 3-chloropropyl silica gel (SG) with 5-amino-1,3,4-thiadiazolyl-2-thiol, and was characterized by spectroscopic techniques as infrared spectroscopy and nuclear magnetic resonance spectroscopy. After characterized, copper ions (Cu2+) were adsorbed and subsequent reaction of potassium hexacyanoferrate (CuSATTH), a systematic study was performed around the voltammetric behavior of the material. The cyclic voltammogram of graphite paste electrode modified with CuSATTH showed two well-defined redox pairs with formal potentials of 0.12 V (I) and 0.83 V (Ag/AgCl(sat.)) assigned Cu-(I)/Cu-(II) and Fe-(II)(CN)(5)NO/Fe-(III)(CN)(5)NO, respectively (80% w/w; v = 20 mV s(-1); NH4NO3 1.0 mol L-1). It was for observed for CuSATTH, using graphite paste electrode, an sensitivity to different concentrations of nitrite. The analytical curve constructed shows a linear response of 6.0 x 10(-6) to 9.0 x 10(-5) mol L-1 (R = 0.998), relative standard deviation of +/- 2.5% (n = 3). The detection limit (3 sigma) and amperometric sensitivity were 4.78 x 10(-6) mol L-1 and 115.96 mA/mol L-1, respectively. (AU)

• FAPESP's process: 15/20397-8 - Surface modification of graphene oxide with a dendrimer: A study of hybrid nanostructured materials for chemical and biological applications
• Grantee: Devaney Ribeiro Do Carmo
• Support Opportunities: Regular Research Grants