Determination and speciation of Hg using HPLC-AFS by atomization of this metal on a UV/nano-ZrO2/HCOOH photocatalytic reduction unit

Determination and speciation of Hg using HPLC-AFS by atomization of this metal on a UV/nano-ZrO2/HCOOH photocatalytic reduction unit
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使用 HPLC-AFS 通过在 UV/纳米 ZrO2/HCOOH 光催化还原装置上雾化该金属来测定 Hg 和形态

DOI:
10.1039/c4ja00455h
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发表时间:
2015-03
影响因子:
3.4
通讯作者:
Wang Qiuquan
Wang Qiuquan
中科院分区:
化学2区
文献类型:
--
作者:
Li Huamin;Xu Zhiguo;Yang Limin;Wang Qiuquan

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首次将UV/nano-ZrO 2/HCOOH体系作为原子化单元和HPLC/AFS在线接口,用于汞的形态分析。紫外光在纳米ZrO 2导带产生电子,将汞还原为汞冷蒸气,实现原子荧光光谱法测定汞。在流动注射(FI)模式下,采用原子荧光光谱法(AFS),无机汞(Hg 2+)、甲基汞(MeHg)和乙基汞(EtHg)的检出限(3σ)分别降低到10、6和8 ng L−1。此外,当与HPLC联用时,Hg的形态分析也可以进行,使用HPLC-(UV/nano-ZrO 2/HCOOH)-AFS系统,Hg 2+、MeHg和EtHg的检出限(3σ)分别为24、13和16 ng L−1,在20 μg L−1时,RSD均优于4.6%(n = 6)。采用标准物质(GBW 10029,金枪鱼)对FI-(UV/nano-ZrO 2/HCOOH)-AFS和HPLC-(UV/nano-ZrO 2/HCOOH)-AFS方法进行了验证,并将其应用于厦门地区海产品中汞的形态分析。
A novel UV/nano-ZrO2/HCOOH system was developed and fabricated as an atomization unit and as an online interface between HPLC and AFS for Hg determination and speciation for the first time. UV-generated electrons at the conduction band of nano-ZrO2 reduce mercury species into mercury cold vapor, achieving mercury atomization for AFS determination. The LODs (3σ) of inorganic mercury (Hg2+), methylmercury (MeHg) and ethylmercury (EtHg) tested in this study were respectively reduced to 10, 6, and 8 ng L−1 when using AFS under flow injection mode (FI). Moreover, Hg speciation could also be performed when coupled with HPLC, and the LODs (3σ) of Hg2+, MeHg and EtHg were 24, 13, and 16 ng L−1, respectively, using the HPLC-(UV/nano-ZrO2/HCOOH)-AFS system, with the RSDs better than 4.6% (n = 6) at 20 μg L−1 each. FI-(UV/nano-ZrO2/HCOOH)-AFS and HPLC-(UV/nano-ZrO2/HCOOH)-AFS were validated by analyzing a certified reference material (GBW10029, tuna fish) and applied to mercury determination and speciation of the local seafood around Xiamen Island.
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