Citation: MA Xu, ZHANG Fang, PAN Jia-Chuan, GUO Peng-Ran, OUYANG Gang-Feng. Detection of Mercury in Environmental Water by Thermal Desorption-Atomic Absorption Spectrometry Coupled with Gold-immobilized Wood Based Solid Phase Microextraction[J]. Chinese Journal of Analytical Chemistry, ;2018, 46(12): 1975-1981. doi: 10.11895/j.issn.0253-3820.181587 shu

Detection of Mercury in Environmental Water by Thermal Desorption-Atomic Absorption Spectrometry Coupled with Gold-immobilized Wood Based Solid Phase Microextraction

1.
School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China;
2.
Guangdong Provincial Engineering & Technological Research Center of Online Monitoring for Aquatic Environment, Guangdong Provincial Key Laboratory of Emergency Test for Dangerous Chemicals, Guangdong Institute of Analysis, Guangzhou 510070, China

Received Date: 10 September 2018
Revised Date: 6 October 2018

Fund Project: This work was supported by the National Natural Science Foundation of China (No. 21777150), the Scientific and Technological Projects of Guangdong Province, China (Nos. 2015A020218001, 2016B020240006, 2017A040405040) and the Scientific and Technological Project of Guangzhou, China (No. 201803030042).

A novel solid phase microextraction (SPME) sampler consisted of gold-immobilized wood-based toothpick was developed for the rapid detection of mercury in environmental water samples via direct analysis in thermal desorption-atomic absorption spectrometry (TD-AAS). Several parameters affecting headspace extraction efficiency of mercury such as gold ions concentration, loading time, extraction time, shaking rate and salt effect, were investigated. The results showed short field analytical time (less than 20 min), good linearity (R² ≥ 0.998) in the range of 0.25-10 ng/mL with the detection limit of 0.03 ng/mL (S/N=3). Furthermore, the relative standard deviations (RSDs) for the sampler-to-sampler reproducibility of eight as-prepared SPME samplers were 2.1% at the spiking level of 1.0 ng/mL. The detection result was in agreement with the certified value of water reference material. The method was applied to analysis of four water samples including tap water, lake water, sea water and waste water with satisfactory spiked recoveries of 89.6%-92.9%, 90.2%-95.3% and 93.8%-106.2% at 1.0 ng/mL, 5.0 ng/mL and 10.0 ng/mL spiking level, respectively, demonstrating the practicality of the proposed method for the determination of mercury in environmental water samples. Characterized by low cost, ease of fabrication and excellent sampler-to-sampler reproducibility, the homemade wood-based SPME sampler in combination with portable TD-AAS is suitable for the on-site screening and risk identification of aqueous mercury contamination.
- Mercury,
- Wood based solid phase microextraction,
- Gold loading,
- Thermal desorption-atomic absorption spectrometry,
- Water
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