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| Characterization of Magnetic Biochar Prepared with Pomelo Peel and Its Application in Detection of Ketamine in Water |
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| DOI： |
| KeyWord:magnetic biochar ultra-high performance liquid chromatography-mass spectrometry ketamine adsorption water |
| Author | Institution |
| MA Shuang，YOU Jia-de，WU Duan-hao，JIANG Mo-li，ZHOU Qin，CAO Shu-rui |
1. Department of Environmental and Quality Inspection，Chongqing Chemical Industry Vocational College，Chongqing ，China;
2. Judicial Appraisal Center，Southwest University of Political Science and Law，Chongqing ，China;
3. School of Advanced Agriculture and Bioengineering，Yangtze Normal University，Chongqing ，China |
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| Abstract: |
| In this study，an ultra-high performance liquid chromatography－tandem mass spectrometry for the rapid detection of ketamine in water was established，based on a magnetic solid-phase extraction technique with magnetic biochar as adsorbent．The magnetic biochar composites with excellent adsorption performance were prepared using the low-cost，environmentally friendly and renewable pomelo peels as biomass raw material，so as to achieve the efficient enrichment and purification of ketamine in water．The characterization results of scanning electron microscope and vibrating sample magnetometer both indicated that the magnetic biochar was successfully synthesized．The sample pretreatment conditions were optimized in detail．Single factor experiments were firstly used to optimize the experimental parameters affecting the extraction efficiency such as the dosage of adsorbent，adsorption time and pH value of solution．Box－Behnken design was further applied to investigate the effects of adsorbent proportion，desorption volume and desorption time on the recovery of ketamine in water．The results revealed that there was good linear relationship for ketamine in the concentration range of 1－100 μg·L-1 under optimal conditions，with correlation coefficient（r） larger than 0.999．The limit of detection of the method was 0.263 μg·L-1，and the limit of quantification was 0.878 μg·L-1．In different actual water samples，the recoveries at four spiked levels of 1，10，20 and 50 μg·L-1 ranged from 84.0% to 99.9%，with intra-day and inter-day relative standard deviations of 0.40%－3.4% and 0.25%－1.9%，respectively．The established method possesses the advantages of easy operation，high efficiency，accuracy，and sensitivity，which is suitable for the detection of ketamine in water. |
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