| 光谱学与光谱分析 |
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| A Study on Decreasing the Instrument Detection Limit of Atomic Fluorescence Spectrometry(AFS-930)for Hg |
| YIN Xue-bin1, LU Xiao-qi1, YAO Chun-xia1, SONG Jing1, QIAN Wei1, LUO Yong-ming1*, LIANG You-qing2, SUN Li-guang2 |
1. Soil and Environment Bioremediation Research Center, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
2. Institute of Polar Environment, University of Science & Technology of China, Hefei 230026, China |
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Abstract In the present study, the detection limit of atomic fluorescence spectrometry (AFS-930) was decreased to 2 ng·L-1 (n=6) based on several optimizing modifications, including that the sub-high voltage of photomultiplier tube and the current of hollow-cathode lamp were elevated to 280 V and to 30 mA, respectively, and the height of atomization cell was set as 10 mm; In addition, the concentration of KBH4 was decreased to 0.5% (KOH 0.2%). With the optimized parameters, a good standard curve of Hg concentration versus intensity of fluorescence (If) could been obtained readily, after that, a 4-ng·L-1-Hg water samples was measured accurately with a little relative standard deviation (RSD) of <5%, while for approximately 2-ng·L-1-Hg waters the RSD varied within a wide range of 10.9%-27.2%, likely due to the absorption of Hg by polyethylene vessels used in this study and/or due to the contamination by analysis grade reagents used in this study. By using low-absorption polytetrafluoroethylene (PTFE) materials and the guaranteed reagents, the instrument detection limit was further decreased to 1 ng·L-1(n=10).
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Received: 2008-02-08
Accepted: 2008-05-12
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Corresponding Authors:
LUO Yong-ming
E-mail: ymluo@mail.issas.ac.cn
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