###### Abstract  
A biomass-derived adsorbent was simply prepared and applied as efficient and low-cost solid-phase supports. The adsorbent material was characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), surface area analysis and Fourier transform infrared (FTIR) spectroscopy. The amorphous structure of the prepared adsorbent was indicated from the XRD. The prepared adsorbent exhibited surface functional groups such as carbonyl and hydroxyl groups, which enhance the application of DSPE. An accurate separation and preconcentration of Cr(III), Fe(III), Co(II) and Ni(II) prior to ICP-MS detection was achieved using the biomass-derived adsorbent. The extraction process was performed at pH 4 using 1 mL of 0.5 N nitric acid for elution and recovery of ions. The prepared biomass-derived adsorbent showed efficient performance for extraction application, exhibiting a preconcentration factor of 50 and LODs of 1.4, 2.4, 1.9 and 3.0 ug.L\({}^{-1}\) for Cr(III), Fe(III), Co(II) and Ni(II), respectively, while the LOQs were reported as 4.1, 7.3, 5.7 and 8.9 ug.L\({}^{-1}\) for Cr(III), Fe(III), Co(II) and Ni(II), respectively. The DSPE procedure presented was successfully applied to the determination of the Cr(III), Fe(III), Co(II) and Ni(II) contamination in some food samples. biomass-derived adsorbent; preconcentration; adsorption; food samples; heavy metals; ICP-MS +
Footnote †: journal: Applied Sciences  
**Citation:** [PERSON], [PERSON]; [PERSON] [PERSON]; [PERSON] [PERSON]; [PERSON] [PERSON]; [PERSON] [PERSON]; [PERSON], [PERSON]; Boimass-Derived Adsorbent for Dispersive Solid-Phase Extraction of Cr(III), Fe(III), Co(II) and Ni(II) prior to ICP-MS detection. **Citation:** [PERSON]; [PERSON] [PERSON]; [PERSON] [PERSON]; [PERSON] [PERSON]; [PERSON] [PERSON]; [PERSON], [PERSON] Boimass-Derived Adsorbent for Dispersive Solid-Phase Extraction of Crplasma mass spectroscopy (ICP-MS), which has a low limit of detection, the extraction procedures serve for sample purification for reducing the matrix effects. The most common techniques for preconcentration methods are liquid-liquid extraction [1], ion exchange [8], coprecipitation [9], solid-phase extraction [10], dispersive solid-phase extraction (DSPE) and electrochemical deposition [11; 12]. Particularly, dispersive solid-phase extraction (DSPE) [13] is one of the most practical substitutes for liquid-liquid extraction in preparing samples due to easy operation and low solvent consumption [14]. In solid-phase extraction, an efficient adsorbent such as Chelex 100 [14], silica spheres [15], polyurethane foam [16] or carbon [17] is applied. For example, [PERSON] et al. (2017) applied the layered double hydroxides of aluminum and magnesium with 4-amino-5-hydroxyl-2,7-naphthalenedisulfonic acid monosodium salt interlayer anions for dispersive solid-phase extraction of Cd\({}^{2+}\), Cr\({}^{6+}\), Pb\({}^{2+}\), Co\({}^{2+}\) and Ni\({}^{2+}\) prior to detection by flame atomic absorption spectrometry (FAAS) [13]. [PERSON] and [PERSON] (2019) developed an -extraction process for preconcentration of Pb(II), Cd(II), Zn(II), Cr(III), Mn(II) and Fe(III) using graphene oxide (GO) nanosheets before detection by inductively coupled plasma optical emission spectrometry (ICP-OES) [18]. Biomass is considered as a cheap source of adsorbent materials [19; 20]; however, the multistep preparation procedures for biomass activation and conversion to activated carbon consume time, energy and chemicals [21; 22]. For example, [PERSON] et al. (2015) summarized the preparation of activated carbon from cattail leaves by physical and chemical activation using phosphoric acid in a two-stage process including thermal treatment at 200 \({}^{\circ}\)C then activation at 500 \({}^{\circ}\)C in muffle furnace [23]. [PERSON] et al.