期刊
ANALYTICA CHIMICA ACTA
卷 1129, 期 -, 页码 108-117出版社
ELSEVIER
DOI: 10.1016/j.aca.2020.07.009
关键词
Colorimetric sensor; Zinc silicate; Indicator-displacement assay; Tartaric acid; Copper; Chromium
资金
- National Natural Science Foundation of China [81772290]
- Graduate Scientific Research and Innovation Foundation of Chongqing [CYB18026]
- Fundamental Research Funds for the Central Universities [2020CDCGSW052]
- Strong-flavor Baijiu Solid-state Fermentation Key Laboratory of China light industry [2019JJ002]
- Chongqing science and technology commission [CSTC2018jcyjAX0062]
- Chongqing Municipal Training Program of Innovation and Entrepreneurship for Undergraduates [S201910611436]
- Chongqing Graduate Tutor Team Construction Project
- Chongqing University's large equipment
High-performance analysis of heavy metal ions is great importance in both environment and food safety. In this work, a facile and reliable colorimetric sensor was presented for simultaneous detection of Cu2+ and Cr3+ based on indicator-displacement assay (IDA). As a typical silicate nanomaterials, ZnSiO3 hollow nanosphere (ZSHS) exhibited an outstanding ion exchange capacity. Zincon was incorporated with the ZSHS to form a zincon/ZSHS hybrid ionophore with a blue color. Upon the addition of Cr3+ IDA reaction and selective ion exchange occurred with the color change of zincon/ZSHS ionophore from blue to yellow. With such a design, colorimetric measurement of Cr3+ was realized. The linear concentration for Cr3+ detection ranged from 0.5 mu M to 75 mu M with the LOD of 83.2 nM. Furthermore, we also screened different kinds of complexing agents that may respond with zincon/ZSHS ionophore and various metal ions. It was found that tartaric acid (TA) showed the chelation capability of Zn2+-TA is stronger than that of Zn2+-zincon. Thus zincon/ZSHS/TA presented a yellow color due to the chelation reaction of Zn2+-TA, releasing the zincon as a free state. After addition of Cu2+, a stronger chelation reaction of Cu2+-zincon occurred. This process involved in the color change from yellow to blue and realized colorimetric measurement of Cu2+. The detection limit of Cu2+ was calculated to be 43.7 nM with linear range from 0.1 to 20 mu M. In addition, the zincon/ZSHS nanoprobe was successfully applied for simultaneous measurement of Cu2+ and Cr3+ in sorghum and river water, indicating that the zincon/ZSHS nanoprobe provided a promising sensing platform in environment and food safety. (C) 2020 Elsevier B.V. All rights reserved.
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