Liquid chromatographic determination of benomyl in water samples after dispersive liquid–liquid microextraction

Abstract

A dispersive liquid-liquid microextraction (DLLME) method combined with solvolysis reaction for extraction of the carbamate fungicide benomyl as carbendazim from water samples is described. The method is based on the extraction of benomyl from acidified sample solution and its conversion into carbendazim via solvolysis reaction with DMF as organic solvent. The proposed DLLME method was followed by HPLC with fluorimetric detection for determination of benomyl. The proposed method has good linearity (0.998) with wide linear dynamic range (0.01-25 mg/L) and low detection limit (0.0033 mg/L), making it suitable for benomyl determination in water samples.

Electro-Oxidation and Determination of Benomyl by Square-Wave Adsorptive Stripping Voltammetry

“…The data obtained from the spiked samples are summarized in Table 2. Results for tap water spiked with 15 and 0.015 mg/L benomyl with recoveries of 91.1 and 90.0, respectively (27), are consistent with the present results for water spiked with 0.30 mg/L and 0.20 mg/L benomyl with recoveries of 99.6 and 99.1, respectively. The applicability of the method for direct determination in water is reasonable because the maximum residue limits in many natural samples exceed our LOD, and maximum allowable concentration for surface water is reported as 0.5 mg/L (28).…”

“…There are many analytical techniques for the quantitative determination of benzimidazoles in different samples. Up to now, HPLC has been most widely used for their determination (5)(6)(7)(8)(9). Guo et al (5) proposed a fast multiresidue approach for direct and simultaneous analysis of benzimidazole fungicides in various raw agricultural commodities using HPLC/MS/MS.…”

“…For the determination of the carbaryl and its key metabolites in soil extracts, an ionic liquid-dispersive liquid-liquid microextraction (DLLME) method was recommended using HPLC with a fluorescence detector (6). DLLME with a solvolysis reaction had good linearity and low LOD (0.0033 mg/L) for the determination of carbendazim from water (8). Molecularly imprinted polymers exhibited high selectivity as a stationary phase in SPE for benzimidazole compounds owing to the high enrichment factors (10,11).…”

Ionic liquid-dispersive liquid–liquid microextraction for the simultaneous determination of pesticides and metabolites in soils using high-performance liquid chromatography and fluorescence detection

“…In this sense, only a small number of studies have been carried out and few fluorescent pesticides have been simultaneously determined. One of the chemical families of pesticides that show native fluorescence is that of benzimidazoles, some of which have been determined by means of a HPLC-FD method [5][6][7][8][9][10][11] in few occasions in soils [7,11]. Also other pesticides of different families have been recently analyzed by HPLC-FD, such as the carbamate carbaryl (CB) and the organophosphorus pesticide triazophos (TZ) [12,13] but only in one occasion in soils [13].…”

Improved solvent collection system for a dispersive liquid–liquid microextraction of organochlorine pesticides from water using low‐density organic solvent

“…Due to the high contact area between the organic solvent and the water sample, the extraction time required by DLLME is very short. DLLME has become a very popular technique for preconcentration 13–18. Recently, ionic liquid DLLME is also very popular 19, 20.…”