期刊
ACS SENSORS
卷 3, 期 4, 页码 792-798出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssensors.8b00038
关键词
chitosan; hexavalent chromium; nonconjugated polymers; cross-link enhanced emission effect; fluorimetric analysis
资金
- National Natural Science Foundation of China [51472246, 51502296]
- Anhui Provincial Natural Science Foundation [1608085QE89]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA09030200]
- CAS/SAFEA International Partnership Program for Creative Research Teams of Chinese Academy of Sciences, China
Selective determination of aquatic chromium is critically important because of the dramatic differences in health and environment impacts by trivalent and hexavalent forms of chromium; however, it is challenging. In this work, for the first time, a nonconjugated polymer fluorophore (GCPF) was synthesized by cross-linking chitosan with glutaraldehyde via Schiff base reactions and systematically investigated for selective determination of Cr(VI). The results revealed that the synthesized GCPF exhibited excellent photostability and water solubility. More importantly, GCPF possessed dramatically enhanced fluorescence intensity originated from the n-pi* transitions of the Schiff base subfluorophore groups (e.g., C=N) that can be selectively and sensitively quenched by Cr(VI) through oxidative damages to C=N group. An effective EDTA masking agent approach was employed to minimize ionic interferences. In the presence of high concentration of interference ions including Cr(III), the quenching GCPF fluorescence is capable of selectively determining Cr(VI) within a concentration range up to 50 mu M and a detection limit of 0.22 mu M. The analytical performance of GCPF was also confirmed by analyzing real surface water and industrial samples.
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