Magnetic graphitic carbon nitride nano-composite for ultrasound-assisted dispersive micro-solid-phase extraction of Hg(II) prior to quantitation by atomic fluorescence spectroscopy

2019 ◽  
Vol 1074 ◽  
pp. 33-42 ◽  
Author(s):  
Meng-ting Shi ◽  
Xin-an Yang ◽  
Wang-bing Zhang
Keyword(s):  
Fluorescence Spectroscopy ◽  
Solid Phase Extraction ◽  
Carbon Nitride ◽  
Solid Phase ◽  
Graphitic Carbon Nitride ◽  
Phase Extraction ◽  
Nano Composite ◽  
Atomic Fluorescence ◽  
Atomic Fluorescence Spectroscopy ◽  
Ultrasound Assisted

scholarly journals Solid Phase Extraction of Inorganic Mercury Using 5-Phenylazo-8-hydroxyquinoline and Determination by Cold Vapor Atomic Fluorescence Spectroscopy in Natural Water Samples

2013 ◽  
Vol 2013 ◽  
pp. 1-15 ◽  
Author(s):  
Mirna Daye ◽  
Baghdad Ouddane ◽  
Jalal Halwani ◽  
Mariam Hamzeh
Keyword(s):  
Fluorescence Spectroscopy ◽  
Solid Phase Extraction ◽  
Solid Phase ◽  
Inorganic Mercury ◽  
Phase Extraction ◽  
Adsorption Model ◽  
Atomic Fluorescence ◽  
Cold Vapor ◽  
Atomic Fluorescence Spectroscopy ◽  
Preconcentration Factor

8-Hydroxyquinoline (8-HQ) was chosen as a powerful ligand for Hg solid phase extraction. Among several chelating resins based on 8-HQ, 5-phenylazo-8-hydroxyquinoline (5Ph8HQ) is used for mercury extraction in which the adsorption dynamics were fully studied. It has been shown that Hg(II) is totally absorbed by 5Ph8HQ within the first 30 minutes of contact time witht1/25 minutes, following Langmuir adsorption model. At pH 4, the affinity of mercury is unchallenged by other metals except, for Cu(II), which have shown higher Kd value. With these latter characteristics, 5Ph8HQ was examined for the preconcentration of trace levels of Hg(II). The developed method showed quantitative recoveries of Hg(II) with LOD = 0.21 pg mL−1and RSD = 3–6% using cold vapor atomic fluorescence spectroscopy (CV-AFS) with a preconcentration factor greater than 250.

scholarly journals A magnetic graphitic carbon nitride as a new adsorbent for simple separation of Ni (II) ion from foodstuff by ultrasound-assisted magnetic dispersive micro solid-phase extraction method

2018 ◽  
Vol 1 (01) ◽  
pp. 47-56 ◽  
Author(s):  
Bahareh Fahimirad ◽  
Alireza Asghari
Keyword(s):  
Solid Phase Extraction ◽  
Carbon Nitride ◽  
Solid Phase ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Phase Extraction ◽  
Flame Atomic Absorption ◽  
Relative Standard ◽  
Separation And Preconcentration ◽  
Ultrasound Assisted

In this research, a magnetic graphitic carbon nitride (g-C3N4-SnFe2O4) was successfully synthesized and utilized as an efficient adsorbent for nickel (Ni2+) separation/extraction from vegetable samples by ultrasound-assisted magnetic dispersive micro solid-phase extraction (UA-M-D-μSPE). After separation and preconcentration step, Ni ions were determined via micro-sampling flame atomic absorption spectrometry (MS-FAAS). A successful synthesis of g-C3N4-SnFe2O4 was investigated by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and vibrating sample magnetometer (VSM). The optimization of adsorption and desorption steps was effectively studied by the on-at-a time method. In addition, under the optimum experimental conditions, the limits of detection (LODs), the linear ranges (LR) and relative standard deviations (RSDs%, for n = 5) were obtained 1.0 μg.L−1, 4.0 ─ 500.0 μg.L−1, and 1.4 respectively.

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