Application of pH-sensitive magnetic nanoparticles microgel as a sorbent for the preconcentration of phenoxy acid herbicides in water samples

Solid‐phase extraction of phenoxyacetic acid herbicides in complex samples with a zirconium(IV)‐based metal–organic framework

“…As a type of major pollutants, pesticides are widely used in insecticide, weeding agriculture and public utilities, and phenoxyacetic acids (PAAs) are important herbicide in the agent . Common PAAs include dicamba, 4‐chlorophenoxyacetic acid, 2,4‐dichlorophenoxyacetic acid, and 2‐(2,4‐dichlorophenoxy)propionic acid and they can be widely distributed in the internal system of plants and thus enter the natural circulation system to cause certain harm, due to their extremely high water solubility, polarity, and good stability . Chemical structures of PAA herbicides and the illustration of the structure of metal–organic frameworks (MOF‐808) are shown in Figure .…”

Rapid and sensitive detection of the phenoxy acid herbicides in environmental water samples by magnetic solid‐phase extraction combined with liquid chromatography–tandem mass spectrometry

“…Phenoxy acid herbicides including 2,4‐dichlorophenoxyacetic acid (2,4‐D), 2‐methyl‐4‐chlorophenoxyacetic acid (MCPA), 2,4,5‐trichlorophenoxyacetic acid, 2‐(4‐chloro‐2‐methylphenoxy)propanoic acid, (2,4,5‐trichlorophenoxy)propionic acid, (2‐methyl‐4‐chlorophenoxy)butyric acid, and 2,4‐dichlorophenoxybutyric acid, as shown in Figure , are widely used in agriculture production to control the broadleaf weeds by making the hormone levels of the weed higher than the normal level for growth . It is very helpful to improve the agricultural product yields by selective control of grass and broadleaf weeds.…”

“…At present, there have been many reports for the analysis of phenoxy acid herbicides in environmental water samples , vegetables and fruits , soil , and other food by GC with electron capture detector or MS, HPLC methods with UV or MS detectors, and CE. Phenoxy acid herbicides with high polarity are not easily vaporized before they could be analyzed by GC.…”

“…Tabani et al. prepared a pH‐sensitive nanoparticles microgel, Fe 3 O 4 –SiO 2 –oly(4‐vinylpyridine), which was used as sorbent to extract phenoxy acid herbicides from water samples . The structure of Fe 3 O 4 –SiO 2 –oly(4‐vinylpyridine) could be changed for the adsorption and desorption of analytes with the changing of environmental pH.…”

Characterization and phase‐transition behavior of thermoresponsive PVME nanogels in the presence of cellulose nanowhiskers: Rheology, morphology, and FTIR studies

“…Hydrogels are chemically or physically crosslinked polymer networks with the ability to absorb considerable amounts of water and can be either in the form of macroscopic networks or in smaller dimensions like microgels or nanogels . Smart hydrogels can respond to external stimuli such as temperature, PH, light, magnetic field, and so forth and their physicochemical properties such as water solubility, shape, volume and optical properties can change in response to such stimuli . For example, in temperature sensitive hydrogels, increasing the temperature above the lower critical solution temperature (LCST) results in a significant decrease in the system volume .…”