Determination of PAHs by ultra fast liquid chromatography using a core-shell technology – Application to their determination after using biochar as adsorbent

Preparation of carboxyl‐functionalized silica core‐shell microspheres and their applications in weak cation exchange chromatography, heavy metal removal, and lysozyme enrichment

“…Standard solutions of different concentrations are obtained by appropriately diluting the stock solution with deionized water. In the adsorption isotherm experiment, prepare 10 mL of a standard solution of Cd(II), Co(II), Ag(I), Cr(III), Ni(II), Cu(II), Mn(II) at different concentrations (10,15,25,30, and 45 µg/mL) to draw a standard curve, about 10 mg BTDA@SiO 2 is added to 10 mL of Cd, Co, Ag, Cr, Ni, Cu, and Mn ion standard solution (20 µg/mL). In the adsorption isotherm experiment, prepare 10 mL Ca (II), Mg (II) standard solutions (0.5, 1.0, 1.5, 3.0, 4.5 µg/mL) to draw a standard curve, about 10 mg BTDA@SiO 2 is added to 10 mL of Ca, Mg ion standard solution (2 µg/mL) was mixed in plastic centrifugal tube (20 mL) and vibrated at 180 rpm for 1 h at 25 • C using a thermostatted rotary vibrator to ensure sufficient adsorption.…”

“…As an important factor for improving separation performance, chromatographic stationary phases have undergone significant evolution in the last half-century. Researchers have successfully synthesized various morphology stationary phases, such as fully porous particles [12], monolithic columns [13,14], core-shell particles [15][16][17], etc. Among these materials, the core-shell structure was first proposed by Horvath [18] and Kirkland [19] in the 1969s.…”

Possibilities and Limitations of Solid-Phase and Liquid Extraction for the Determination of Polycyclic Aromatic Hydrocarbons in Environmental Samples

“…The recovery of PAHs from biochar in a Soxhlet apparatus can reach 70% depending on the solvent chosen [117]. Janus et al [118] described an example of the extraction of PAHs from water, but the sorbents were effective at high concentrations of PAHs; therefore, the use of biochar for analytical purposes is limited [119,120].…”