DABCOnium Ionic Liquid‐Immobilized Silica Gel for Solid Phase Extraction of Phenoxyacetic Acid Herbicides in Water Samples

A novel sorbent (SiO2‐(CH2)3‐DABCO) for solid‐phase extraction (SPE) was successfully prepared by chemical‐bonding formation of diazabicyclo[2.2.2]octane ionic liquid onto silica gel. The structure of SiO2‐(CH2)3‐DABCO sorbent was characterized by FT‐IR, TGA, SEM, EDX, and BET methods. Cartridges pa...

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Published in:ChemistrySelect (Weinheim) 2022-12, Vol.7 (46), p.n/a
Main Authors: Nguyen, The Thai, Nguyen, Thinh Phuc, Tran, Long Nam, Huynh, Tam Thanh Thi, Nguyen, Nhi Hoang, Nguyen, Linh Ho Thuy, Le, Tien Thi My, Doan, Tan Le Hoang, Nguyen, Mai Anh, Tran, Phuong Hoang
Format: Article
Language:English
Subjects:
DABCO
Ionic liquids
Phenoxyacetic acid herbicides
Silica gel
Solid-phase extraction
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Summary:A novel sorbent (SiO2‐(CH2)3‐DABCO) for solid‐phase extraction (SPE) was successfully prepared by chemical‐bonding formation of diazabicyclo[2.2.2]octane ionic liquid onto silica gel. The structure of SiO2‐(CH2)3‐DABCO sorbent was characterized by FT‐IR, TGA, SEM, EDX, and BET methods. Cartridges packed with the synthetic SiO2‐(CH2)3‐DABCO were used for the preconcentration of trace‐level of phenoxyacetic acid herbicides in water samples for the first time. The factors influencing on the recovery were investigated, such as type of ion liquids, loading volume, eluents, elution volume, loading rate, and capacity. After the enrichment, the phenoxyacetic acid herbicides were analyzed by high‐performance liquid chromatography with an ultraviolet detector. Four model phenoxyacetic acid herbicides, including 2‐methyl‐4‐chlorophenoxyacetic acid (MCPA), 2,4,5‐trichlorophenoxyacetic acid (2,4,5‐T), fenoprop (2,4,5‐TP) and haloxyfop were well retained and separated by this material with a recovery efficiency from 77 to 103 %. The SiO2‐(CH2)3‐DABCO demonstrated a good capacity corresponding to 0.56 mg of the analyte adsorbed per 100 mg of the material. The mixture of phosphate buffer (pH 7) : MeOH (50 : 50, v/v) was used to elute the analytes and provided the highest recovery with the standard deviations from 2.4 to 6.5. The high sensitivity with detection limits of 1.070–9.587 μg/L can be achieved. We have developed an effective sorbent for the preconcentration of trace‐level of phenoxyacetic acid herbicides, including MCPA, 2,4,5‐T, 2,4,5‐TP, and haloxyfop in water samples. The effects of sorbents, eluents, elution volume, loading volume, loading rate, and capacity were carefully investigated.
ISSN:2365-6549
2365-6549
DOI:10.1002/slct.202203526