Cr3+和铬（III）吡啶甲酸盐可以通过硫化物掩蔽Cu2+和Ag+后进行定量测量。在最佳条件下，Cr3+在0～2.0 M范围内线性猝灭，检测限为3.0 nM。所获得的Cr3+维生素补充剂的回收率为92.5％至106％。将维生素补充剂样品中铬（Ⅲ）吡啶甲酸铬的测定结果与火焰原子吸收光谱法（FAAS）进行对比，结果表明该方法具有较好的可靠性。
文章摘要/abstract
Fluorescence sensor based on glutathione capped CdTe QDs for detection of Cr3+ ions in vitamins
Chi-Fang Peng a,b,c,?, Ying-Ying Zhang a,b, Zhi-Juan Qian d, Zheng-Jun Xie a,b
（a. State Key Lab of Food Science and Technology, Jiangnan University, Wuxi 214122, PR China
b. School of Food Science and Technology, Jiangnan University, Wuxi 214122, PR China
c. National Engineering Research Center for Functional Food, Jiangnan University, Wuxi 214122, PR China
d. Yangzhou Entry-Exit Inspection and Quarantine Bureau, Yangzhou 225000, PR China）
Received 13 September 2017; received in revised form 17 November 2017; accepted 6 December 2017
Available online 20 December 2017
Abstract:
In this work, glutathione capped CdTe QDs (GSH-QDs) were prepared through a one-pot process and found to be quenched by Cr3+, Ag+ and Cu2+ ions. Cr3+ and chromium (III) picolinate could be quantitatively measured after masking Cu2+ and Ag+ ions by sulfide. Under optimal conditions, linear quenching was observed for Cr3+ in the ranges of 0–2.0 μM and the limit of detection was 3.0 nM. The recoveries for Cr3+ in vitamin supplements obtained were from 92.5% to 106%. The determination results of chromium (III) picolinate in vitamin supplement samples were compared to that obtained using flame atomic absorption spectrometry (FAAS) method, and the result showed good reliability.
