Metal-organic Framework-Modified Carbon Paste Electrode for Determining Lead in Aqueous Solutions

被引：6

作者：

Domingos Batista, Luiz Carlos ^{[1
]}

Silva Santos, Thiago Izidoro ^{[1
]}

Florencio da Silva Santos, Victor Hugo ^{[1
]}

Lucena de Oliveira, Joao Bosco ^{[1
]}

Martins de Moura Santos, Elaine Cristina ^{[1
]}

da Silva, Djalma Ribeiro ^{[1
]}

Martinez-Huitle, Carlos A. ^{[1
,2
]}

机构：

[1] Univ Fed Rio Grande do Norte, Inst Chem, BR-59078970 Natal, RN, Brazil

[2] UNESP, Natl Inst Alternat Technol Detect Toxicol Evaluat, Inst Chem, POB 355, BR-14800900 Araraquara, SP, Brazil

来源：

INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE | 2020年 / 15卷 / 10期

基金：

巴西圣保罗研究基金会;

关键词：

MOF 235; carbon paste electrode; lead; modified electrode; SIMULTANEOUS ELECTROCHEMICAL DETERMINATION; VOLTAMMETRIC DETERMINATION; CADMIUM; PB(II); SENSOR; IUPAC; RICE; ACS;

D O I：

10.20964/2020.10.42

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

In this work, a novel carbon paste electrode was modified with metal-organic framework (MOF) 235 for detecting lead ions in aqueous solutions using anodic redissolution voltammetry as analytical technique. Experimental parameters such as, amount of MOF-235, type of supporting electrolyte, potential and time deposition were evaluated to optimize the detection approach. The Pb2+ detection response of this MOF-modified electrode allowed to achieve a detection limit of about 18 mu g L-1 with a correlation coefficient (R-2) of about 0.9962, extending in a linear concentration range from 50 to 300 mu g L-1. Drinking water samples (as-received or spiked with well-known lead concentration) were analyzed to determine the concentration of lead ions. Data were also confirmed by Atomic Absorption Spectroscopy (AAS). Furthermore, the electrochemical determination when compared with the AAS, has shown that the electroanalytical approach represents a fast and quite reliable alternative for monitoring heavy metals.

引用

页码：10081 / 10092

页数：12

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