A new DLLME method with UV–Vis spectrophotometric detection
was developed for the preconcentration and determination of trace
amount of carbendazim in water and soil samples. The suggested
DLLME method provides advantages such as simplicity, rapidity, low
operation cost and solvent volume, employment of usual laboratory
equipment, high preconcentration factor, and short extraction time.
Although various analytical methods have been reported for the
determination of carbendazim in different crop matrices and environmental
samples, to the best of our knowledge this is the first
combined preconcentration and spectrophotometric method for carbendazim.
Spectrophotometric detection has merits of simplicity,
cheapness, and portability. In addition, in this method there is no
need for conventional dispersive solvents because the Aliquat 336
used for assisting the extraction of blue product by forming an ion
pair, also acted as a disperser. A comparison between the present
DLLME- UV–Vis spectrophotometry method and other sample preparation
techniques from the viewpoint of linearity, LOD, % RSD, and
EF are shown in Table 5. As can be seen in the table the LOD,
enrichment factor and RSD % of the suggested method is better or
comparable to some of the reported techniques and especially the
extraction time for this method is much shorter since the extraction
equilibrium is reached quickly due to the large surface area between
the organic droplets and the aqueous sample solution.