Study on solid phase extraction and spectrophotometric determination of vanadium with 2,3-dichloro-6-(2,7-dihydroxy-1-naphthylazo)quinoxaline

A sensitive method for determining total vanadium in water samples using colorimetric-solid-phase extraction-fiber optic reflectance spectroscopy

“…Conventional solid phase extraction techniques, require sophisticated, expensive, nonportable equipment, thus limiting their usefulness as real-time detection systems [28][29][30][31][32][33][34][35][36]. SPE is a laboratory method and cannot be transported to the field for onsite measurements.…”

“…SPE is a laboratory method and cannot be transported to the field for onsite measurements. The solid phase extraction reduces solvent requirements, but it does not eliminate them completely [28,31,33,36]. A comparison of the proposed system with some recent studied procedures is given in Table 4.…”

“…A comparison of the proposed system with some recent studied procedures is given in Table 4. The developed method represents an advantageous alternative to other available SPE methods, because it is more simple, inexpensive, portable, allows rapid measurement at low operating costs and free from most interfering substances [28][29][30][31][32][33][34][35][36]. Accurate and reproducible results are obtained with permissible standard deviations.…”

Solid-phase extraction gold from alkaline cyanide solution with quaternary ammonium surfactant

“…Based on Refs. [17][18][19][20], the authors proposed and explored the two types of techniques, namely the SPE and the LLE of the quaternary ammonium surfactant. The joint research of the two types of techniques obtained satisfactory results, and we are looking forward to discovering some new highlights and enriching the knowledge of extraction chemistry in theory.…”

Ionic liquid-based single drop microextraction of ultra-trace copper in food and water samples before spectrophotometric determination

“…This would greatly expand its applications, especially for the less developed area without more advanced analytical instruments. But recently, few works were carried out in this field, except for solvent extraction [16,17], solid phase extraction [18,19], cloud point extraction and surfactant-mediated extraction [20][21][22] In our previous work, dispersive liquid liquid microextraction (DLLME) [23] and single drop microextraction (SDME) [10] were investigated to be combined with ordinary spectrophotometer. In this work, UV-vis spectrophotometry was applied to hyphenate with ionic liquid-based SDME for the determination of copper in water and food samples.…”