期刊
MICROCHIMICA ACTA
卷 186, 期 7, 页码 -出版社
SPRINGER WIEN
DOI: 10.1007/s00604-019-3561-z
关键词
TGA-ZnSe QDs; Test strip; Dipping-drying method; Colorimetric determination; Grey level; On-site examination; Color reaction; Aggregation of QDs; Metal-ligand interaction
资金
- Yunnan University's Research Innovation Fund for Graduate Students [YDY17106]
- National Natural Science Foundation of China [61761047, 41876055]
Thioglycolic acid-functionalized ZnSe quantum dots (QDs) as a colorimetricnanoprobe were prepared and applied to the determination of cobalt(II) and iron(III). Test strips were obtained by a dipping-drying process. On exposure to Co(II), they undergo a color change from white to brown, and on exposure to Fe(III) from white to pink. The limits of detection (LOD) are 2.6mgL(-1) for Co(II) and 2.2mgL(-1) for Fe(III). Test strips introduce a low-cost, portable, rapid and convenient tool for determination of Co(II) and Fe(III). In addition, two other analytical methods have been studied for detection of Co(II) and Fe(III) at low concentration. The first is UV-vis spectrometry which has a LOD as low as 0.14mgL(-1) for Co(II) (at 412nm) and 0.12mgL(-1) for Fe(III) (at 400nm). The second is dynamic light scattering (DLS) with a LOD of 3.0gL(-1) for Co(II) and 2.5gL(-1) for Fe(III).
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