Abstract：
:A novel copper hydroxy phosphate@MOF composite DMP-Cu decorated by 2, 5-dimercapto-1, 3, 4-thiadiazol was facilely prepared and characterized. A dispersive SPE strategy using DMP-Cu as adsorbent combined with atomic fluorescence spectroscopy was developed for the selective capture of trace total mercury in rice sample. The adsorption mechanism showed that the Hg2+ removal process was fitted with pseudo second-order kinetics and the Langmuir adsorption model. The adsorbent was easy to be regenerated and the maximum adsorption capacity for the removal of Hg2+ was 249.5 mg g-1 at the optimal pH of 4. X-ray photoelectron spectroscopy and Raman spectra verified the selective and strong interaction between Hg2+ and thiol/nitrogen-containing functional groups of DMTZ on DMP-Cu. The trace total mercury in rice samples was determined with detection limit of 0.0125 ng mL-1 and relative standard deviation below 6%. The high recoveries were obtained in range of 98.8-109% for the spiked rice samples.
journal_name
Food Chemjournal_title
Food chemistryauthors
Song C,Zhang Y,Li X,Ouyang G,Cui J,Zhang L,Yu A,Zhang S,Cui Ydoi
10.1016/j.foodchem.2020.128508subject
Has Abstractpub_date
2021-05-01 00:00:00pages
128508eissn
0308-8146issn
1873-7072pii
S0308-8146(20)32370-0journal_volume
343pub_type
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