An Application to Quantitative Analysis of Hg (II) with L-Cysteine Molecular Probe by Surface-Enhanced Raman Spectroscopy

作者：Zhang Cai-hong; Zhou Guan-ming^*; Zhang Lu-tao; Luo Dan; Yu Lu; Gao Yi

来源：Spectroscopy and Spectral Analysis, 2018, 38(1): 117-122.

DOI：10.3964/j.issn.1000-0593(2018)01-0117-06

• SERS
• Silver nanorods
• L-cysteine
• Mercury ions

In this paper, a detection of trace Hg (II) was based on silver nanorods by surface-enhanced Raman spectroscopy (SERS)activity. It was discussed the probe types, which explored that the L-cysteine with a high selectivity and sensitivity for Hg(II). The UV/Vis spectra was used to characterize the silver nanorods and its modified the L-Cys. Based on L-cysteine of SERS was high sensitivity and selectivity for Hg(II) on condition that the ten kinds of metal ions carried on, but only when the single-peak at 1 040 cm(-1) structure appeared after adding the Hg(II). SERS sensor with L-cysteine assembled silver nanorods firmly captured the Hg(II) through the S-Hg bond. It was valuable to get the molecular probe of the concentration, pH and temperature, in which the result showed the optimization when the density of L-cysteine was 1 X 10(-3) mol . L-1 and pH was 7. It did not have a great effect on temperatures, but was down trend over 55 degrees C. In order to protect the structure of L-Cysteine and form complexes rapidly, it was selected temperature about 45 degrees C. Under the optimized conditions, a series of the concentration of mercury ions were measured, in which the result showed that the density of mercury ions between 0. 01 and 5 mu mol . L-1 can be analyzed because of a strong peak at 1 040 cm(-1) with good linear relationships (correlation=0. 990) with the detection limit of 1 nmol . L-1. Which had very excellent sensitivity and stability. When Hg2+ was tested in real water samples, the recovery was from 85%similar to 103%. It establishes a good way to determine the trace Hg(II).

• 出版日期2018-1
• 单位西南大学