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Sensitive monitoring of benzoylurea insecticides in water and juice samples treated with multiple monolithic fiber solid-phase microextraction and liquid chromatographic analysis.

Analytica chimica acta (2015-02-16)
Meng Mei, Xiaojia Huang, Keren Liao, Dongxing Yuan
ABSTRACT

In present study, a convenient, sensitive and environmentally friendly method for the determination of five benzoylurea insecticides (BUs) in water and juice samples was developed. To extract trace benzoylurea insecticides effectively, poly(methacrylic acid-co-ethylene dimethacrylate) monolith was prepared and used as the sorbent of multiple monolithic fiber solid-phase microextraction (MMF-SPME). The influences of preparation conditions of monolith and extraction parameters of MMF-SPME on BUs were studied thoroughly. Under the optimized conditions, the combination of MMF-SPME with high performance liquid chromatography-diode array detection (MMF-SPME-HPLC-DAD) showed expected analytical performance for target analytes. The limits of detection (S/N=3) of the developed method were 0.026-0.075 μg L(-1) in water and 0.053-0.29 μg L(-1) in juice samples. Good linearity was obtained for analytes with the correlation coefficients (R(2)) above 0.99. Satisfactory repeatability and reproducibility was achieved, with relative standard deviations (RSD) of both less than 10%. Finally, the established MMF-SPME-HPLC-DAD method was successfully applied for the determination of BUs residues in juice and environmental water samples. Recoveries obtained for the determination of BUs in spiking samples ranged from 65.1% to 118%, with RSD below 10% in all cases.

MATERIALS
Product Number
Brand
Product Description

Supelco
SPME fiber assembly Polydimethylsiloxane (PDMS), df 100 μm (PDMS), for use with manual holder, needle size 23 ga
Supelco
SPME fiber assembly polyacrylate (PA), df 85 μm (PA), for use with manual holder, needle size 24 ga
Supelco
SPME fiber assembly Polydimethylsiloxane (PDMS), df 7 μm (PDMS), needle size 24 ga, for use with autosampler
Supelco
SPME fiber assembly Polydimethylsiloxane (PDMS), df 30 μm (PDMS), needle size 24 ga, for use with manual holder
Supelco
SPME Portable Field Sampler, coating PDMS/DVB
Supelco
SPME fiber assembly Polydimethylsiloxane (PDMS), df 7 μm (PDMS), needle size 24 ga, for use with manual holder
Supelco
SPME Sampling Stand, for use with 4 mL vials
Supelco
SPME fiber assembly Polydimethylsiloxane (PDMS), df 100 μm (PDMS), for use with autosampler, needle size 24 ga
Supelco
SPME fiber assembly polyacrylate (PA), df 85 μm (PA), for use with autosampler, needle size 24 ga
Supelco
SPME fiber assembly Polydimethylsiloxane (PDMS), df 30 μm (PDMS), needle size 24 ga, for use with autosampler
Supelco
SPME Portable Field Sampler, coating CAR/PDMS
Supelco
SPME Sampling Stand, for use with 15 mL vials
Supelco
SPME fiber assembly polyacrylate (PA), df 85 μm (PA), for use with autosampler, needle size 23 ga
Supelco
SPME fiber assembly Polydimethylsiloxane (PDMS), df 7 μm (PDMS), needle size 23 ga, for use with autosampler
Supelco
SPME fiber assembly Polydimethylsiloxane (PDMS), df 100 μm (PDMS), needle size 24 ga, for use with manual holder
Supelco
SPME Portable Field Sampler, coating PDMS
Supelco
SPME fiber assembly Polydimethylsiloxane (PDMS), df 100 μm (PDMS), for use with autosampler, needle size 23 ga
Supelco
SPME LC Tips, PDMS/DVB, pkg of 96 ea
Supelco
SPME-OC Fiber Assembly, Polydimethylsiloxane/Divinylbenzene (PDMS/DVB), df 75 μm (Coating thickness includes 65 μm coating + 10 μm OC (overcoating)), needle size 23 ga, pkg of 3 ea, fiber L 1 cm
Supelco
IonSense® C18 SPE-it Tips, pkg of 96 ea
Supelco
SPME fiber assembly Polydimethylsiloxane (PDMS), metal alloy fiber, df 100 μm (PDMS), needle size 23 ga, for use with autosampler
Supelco
SPME fiber assortment kit 5, needle size 23 ga, for use with autosampler
Supelco
SPME fiber assembly, Carbowax-Polyethylene Glycol (PEG) Coating, needle size 23 ga, df 60 μm (PEG), metal alloy fiber, for use with manual holder
Supelco
SPME fiber assembly, Carbowax-Polyethylene Glycol (PEG) Coating, needle size 23 ga, df 60 μm (PEG), for use with autosampler
Supelco
SPME Fiber Assembly Polydimethylsiloxane/Divinylbenzene (PDMS/DVB), df 65 μm (PDMS/DVB), needle size 23 ga, PDMS/DVB StableFlex, for use with autosampler
Supelco
SPME StableFlex fiber assortment kit, for use with autosampler, needle size 24 ga
Supelco
SPME fiber assortment kit 4, for use with autosampler, needle size 23 ga
Supelco
SPME fiber assortment kit 1, for use with autosampler, needle size 23 ga
Supelco
SPME fiber assortment kit 2, for use with autosampler, needle size 23 ga
Supelco
SPME fiber assortment kit 4, for use with autosampler, size 24 ga