Evaluation of a magnetic activated charcoal modified with non-ionic silicone surfactant as a new magnetic solid phase extraction sorbent with triazine herbicides as model compounds in selected milk and rice samples

Mohd, Noraini; Gopal, K.; Raoov, Muggundha; Mohamad, Sharifah; Yahaya, Noorfatimah; Lim, Vuanghao; Zain, Nur Nadhirah Mohamad

doi:10.1016/j.talanta.2018.12.043

Cited by 28 publications

(10 citation statements)

References 48 publications

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“…The spectrum of SiO 2 ‐TiO 2 ‐NH 2 @Fe 3 O 4 shows characteristic peaks almost similar to SiO 2 ‐TiO 2 ‐NH 2 . The only difference between SiO 2 ‐TiO 2 ‐NH 2 and SiO 2 ‐TiO 2 ‐NH 2 @Fe 3 O 4 spectra is a sharp peak at 582 cm −1 due to the existence of the Fe‐O vibration bond [23]. The magnetization of SiO 2 ‐TiO 2 ‐NH 2 @Fe 3 O 4 was measured with the help of the VSM at room temperature.…”

Section: Resultsmentioning

confidence: 99%

“…The highest extraction recoveries of the analytes were achieved at pH 6 (Figure 3B). At strongly acidic and basic pH, the recoveries were dramatically decreased due to the hydrolysis of target analytes [23,26–28]. The pH on zeta potential (pH pzc ) of mixed silica‐titania is around 3 and it is assumed that after modification with aminopropyl groups (p K a = 9.8), it shifts to nearly 7 [14, 29].…”

Section: Resultsmentioning

confidence: 99%

“…The pH on zeta potential (pH pzc ) of mixed silica‐titania is around 3 and it is assumed that after modification with aminopropyl groups (p K a = 9.8), it shifts to nearly 7 [14, 29]. In addition, the surface charge of Fe 3 O 4 NPs decorated on SiO 2 ‐TiO 2 ‐NH 2 @Fe 3 O 4 is commonly neutral (pH 7) [23]. Hence, at pH 6, the surface of sorbent is positively charged (‐NH 3 + ) that leads to formation of electrostatic interactions with negatively charged analytes (atrazine (p K a = 1.65) [27], chlorpyrifos (no p K a ) [30], hexaconazole (p K a = 2.7) [31], and malathion (p K a = −6.8) [32]).…”

Section: Resultsmentioning

confidence: 99%

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Magnetic amino‐functionalized hollow silica‐titania microsphere as an efficient sorbent for extraction of pesticides in green and roasted coffee beans

Asadi

Sereshti

2020

J of Separation Science

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This study describes the synthesis and application of a magnetic amino-functionalized hollow silica-titania microsphere as a new sorbent for magnetic dispersive microsolid phase extraction of selected pesticides in coffee bean samples. The sorbent was fully characterized by Fourier-transform infrared spectroscopy, field emission scanning electron microscopy, transition electron microscopy, energy-dispersive X-ray spectroscopy, and vibrating sample magnetometry techniques. Significant extraction parameters affecting the proposed method, such as extraction time, sorbent amount, sample solution pH, salt amount, and desorption conditions (desorption solvent and time) were investigated and optimized. All the figures of merits were validated in coffee bean samples under the matrix-matched calibration method. Linear dynamic ranges were 5-250 μg/kg with the determination coefficients (R 2 ) > 0.9980. The limits of detection for the pesticides of chlorpyrifos, malathion, hexaconazole, and atrazine were 1.42, 1.43, 1.35, and 1.33 μg/kg, respectively. Finally, the method was successfully applied for the determination of the pesticides in green and roasted coffee bean samples, and the obtained recoveries were in the range of 74-113% for spiked samples.The prepared sorbent could be used for the magnetic dispersive micro-solid phase extraction of pesticides in the plant-derived food matrix. K E Y W O R D Scoffee beans, hollow silica-titania microspheres, magnetic solid phase extraction, pesticides for chlorpyrifos, 50 μg/kg for hexaconazole, and 100 μg/kg for atrazine in coffee beans [3]. Capillary GC and HPLC are the most widely used techniques for pesticide analysis [4]. Before instrumental

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Magnetic amino‐functionalized hollow silica‐titania microsphere as an efficient sorbent for extraction of pesticides in green and roasted coffee beans

Asadi

Sereshti

2020

J of Separation Science

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“…The nonionic silicone surfactant was coated with magnetic nanoparticles for modification of activated charcoal (AC) that was used as a magnetic adsorbent (Mohd et al, 2019).…”

Section: Annual Literature Reviewmentioning

confidence: 99%

“…The nonionic silicone surfactant was coated with magnetic nanoparticles for modification of activated charcoal (AC) that was used as a magnetic adsorbent (Mohd et al, 2019). The combination of AC with HPLC‐DAD was applied for extraction and quantification of triazine herbicides from milk and rice.…”

Section: Extraction Techniquesmentioning

confidence: 99%

Analytical methods to analyze pesticides and herbicides

Begum

Xue

2020

Water Environment Research

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This paper reviews studies published in 2019, in the area of analytical techniques for determination of pesticides and herbicides. It should be noted that some of the reports summarized in this review are not directly related to but could potentially be used for water environment studies. Based on different methods, the literatures are organized into six sections, namely extraction methods, electrochemical techniques, spectrophotometric techniques, chemiluminescence and fluorescence methods, chromatographic and mass spectrometric techniques, and biochemical assays.

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