Synthesis and characterization of functionalized silica with 3,6-ditia-1,8-octanediol for the preconcentration and determination of lead in milk employing multicommuted flow system coupled to FAAS

Silva, Paulo A.B. da; Souza, Gustavo C. S. de; Leoterio, Dilmo Marques da Silva; Belian, Mônica F.; Silva, Wagner E.; Paim, Ana Paula S.; Lavorante, André F.

doi:10.1016/j.jfca.2014.12.025

Cited by 15 publications

(6 citation statements)

References 54 publications

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“…In the spectrum of Fe 3 O 4 @SiO 2 –NH 2 , the characteristic absorption peak at 2929 cm –1 and the broad peak at 3486 cm –1 were caused by the C–H stretching vibration of the alkyl chain and the related N–H absorption band of the amino group overlapping with the O–H stretching vibration in APTES, respectively. The characteristic absorption peak of the H–O–H bending vibration was also evident at 1641 cm –1 . All these absorption peaks indicated that APTES was successfully bonded to the magnetic silicon sphere surface.…”

Section: Resultsmentioning

confidence: 82%

Excellent Pd-Loaded Magnetic Nanocatalyst on Multicarboxyl and Boronic Acid Biligands

Jia,

Cheng,

Zhao

et al. 2024

ACS Omega

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An effective palladium nanocatalyst (Fe 3 O 4 @SiO 2 −FPBA−DTPA−Pd) was proposed and prepared, which was immobilized on magnetic silica with ethylenediamine pentaacetic acid and formylphenylboronic acid as biligands. A series of characterizations showed that Fe 3 O 4 @SiO 2 −FPBA−DTPA−Pd was 5−15 nm and contained 1.44 mmol/g Pd 2+ /Pd 0 . It was stable below 232.7 °C, and its saturation magnetization value was 21.17 emu/g which was easily recycled by a magnet. Its catalytic ability was evaluated through 7 Suzuki reactions and 15 Heck reactions. Results showed that the yields of 14 reactions catalyzed by Fe 3 O 4 @ SiO 2 −FPBA−DTPA−Pd were more than 90%, while were better than those of the other two immobilized Pd catalysts on a single diethyltriamine pentaacetic acid (DTPA) group or boronic acid group. Moreover, Fe 3 O 4 @SiO 2 −FPBA−DTPA−Pd showed good reusability in both Suzuki and Heck reactions. In two model Suzuki and Heck reactions, after seven cycles, its yields were still above 95% without significant loss, which exceeded those of many reported catalysts; therefore, it has great potential in future large-scale industrial production.

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Section: Resultsmentioning

confidence: 82%

Excellent Pd-Loaded Magnetic Nanocatalyst on Multicarboxyl and Boronic Acid Biligands

Jia,

Cheng,

Zhao

et al. 2024

ACS Omega

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“…The various methods was used for determination lead in different matrix samples [13,19]. The most well-known methods are; flame atomic absorption spectrometry (FAAS) [20], graphite furnace atomic absorption spectrometry (GFAAS) [21], inductively coupled plasma-optical emission spectrometry (ICP-OES) [13], and inductively coupled plasmamass spectrometry (ICP-MS) [22]. Due to the low concentration of lead in biological matrix, interferences ions and difficulty analysis of lead, a sample preparation step before the determination process is necessary [23,24].…”

Section: Introductionmentioning

confidence: 99%

Separation and determination of lead in human urine and water samples based on thiol functionalized mesoporous silica nanoparticles packed on cartridges by micro column fast micro solid-phase extraction

Gou

Yarahmadi

2019

Anal. Method Environ. Chem. J.

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An efficient method based on thiol functionalized mesoporous silica nanoparticles (HS-MSNPs) was used for extraction of lead ions (PbII) from urine and water samples by packed column micro solid phase extraction (PC-MSPE). By procedure, 15 mg of HS-MSNPs packed in syringe cartridges (SC, 5 mL) with cellulose membrane and pH adjusting at 5.5-6.5. Then, the lead of urine and water sample was efficiently extracted on HS-MSNPs after pushing the plunger of a syringe. Finally, the Pb (II) was back-extracted with inorganic acid solution and the remained solution determined by electrothermal atomic absorption spectrometry (ET-AAS). By optimization conditions, the enrichment factor, LOD, linear range and RSD% was obtained 24.8, 0.04 μg L-1, 0.12-5.5 μg L-1 and less than 5%, respectively for 5 mL of urine samples. The validation was confirmed by spiking of real samples and using certified reference material (CRM, NIST) in water and urine sample.

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“…These methodologies have been well reported, such as automation tools for handling solutions and pre-treatment of samples 7 . Examples include the coupling of interfaces in flow analysis for pre-treatment of sample such as, gas-liquid (gas diffusion, distillation and hydride generation), liquid-liquid (extraction and dialysis) and liquid-solid (ion exchange, adsorption, precipitation, dissolution and stripping) [8][9][10][11][12][13][14] . The indirect determination of RS in of wine employing the classical Fehling's reaction and flow injection coupled to atomic absorption spectrometry (AAS) was reported by Yebra et al (1993) 15 .…”

Section: Introductionmentioning

confidence: 99%

“…Other approach uses of the MCFIA have been with micro-pumps, devices that produce a pulsed flow, thus increasing the interactions between the solutions in the MCFIA system 6 . Furthermore, environmentally friendly systems and highly sensitive analyses have been achieved 9,12,22 . Additional advantages of the micro-pumps in a multicommutation system include portability, low energy requirements and the ability to minimize volume reagent consumed and consequently waste generation 23,24 .…”

Section: Introductionmentioning

confidence: 99%

Spectrophotometric Determination of Reducing Sugar in Wines Employing in-Line Dialysis and a Multicommuted Flow Analysis Approach

Silva

Souza

Paim

et al. 2018

J. Chil. Chem. Soc.

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A multicommuted flow procedure for the spectrophotometric determination of reducing sugars in wine has been developed. A dialysis unit was incorporated in the system to minimize matrix interferences and eliminate the colored compounds of the wine. The oxidation-reduction reaction in an alkaline medium between reducing sugars and the Cu 2+ -Neocuproine complex was employed. The compound formed was monitored at 460 nm. In the proposed procedure, there was a linear response between 0.25 and 4.0 g L -1 reducing sugars (y = (0.36 ± 0.02) + (0.31 ± 0.01) * x, R = 0.9975, n = 6), a coefficient of variance of 2.6% for a reducing sugar solution of 2.0 g L -1 (n = 7), a limit of detection estimated at 0.03 g L -1 , reagent consumption per determination of 0.330, 0.128 and 0.160 mg for neocuproine, CuSO 4 and NaOH, respectively. A sampling throughput of 45 determinations per hour was achieved. The proposed system was applied to wine samples and comparing the results with an AOAC official method no significant difference at a 95% confidence level.

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Synthesis and characterization of functionalized silica with 3,6-ditia-1,8-octanediol for the preconcentration and determination of lead in milk employing multicommuted flow system coupled to FAAS

Cited by 15 publications

References 54 publications

Excellent Pd-Loaded Magnetic Nanocatalyst on Multicarboxyl and Boronic Acid Biligands

Excellent Pd-Loaded Magnetic Nanocatalyst on Multicarboxyl and Boronic Acid Biligands

Separation and determination of lead in human urine and water samples based on thiol functionalized mesoporous silica nanoparticles packed on cartridges by micro column fast micro solid-phase extraction

Spectrophotometric Determination of Reducing Sugar in Wines Employing in-Line Dialysis and a Multicommuted Flow Analysis Approach

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