Micro solid phase spectrophotometry in a sequential injection lab-on-valve platform for cadmium, zinc, and copper determination in freshwaters

Santos, Inês C.; Mesquita, Raquel B. R.; Rangel, António O.S.S.

doi:10.1016/j.aca.2015.08.021

Cited by 32 publications

(14 citation statements)

References 37 publications

(16 reference statements)

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“…Finally, a 20 μL portion is injected to an HPLC instrument for the separation and quantification of the phenolic acids. Figure 1 shows an illustration of the system used for an automated SPE [5,31,32], as well as the preparation of a LDH- Supporting Information Figure S1A shows the X-ray diffraction pattern of the membrane before and after the in situ conversion. In the case of the Al 2 O 3 -MMD, the X-ray diffraction peaks of the corresponding diffractogram can be assigned to Al 2 O 3 (JCPDS No.…”

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confidence: 86%

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Automated solid‐phase extraction of phenolic acids using layered double hydroxide–alumina–polymer disks

Ghani

Cabello

Saraji

et al. 2018

J of Separation Science

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The application of layered double hydroxide-Al O -polymer mixed-matrix disks for solid-phase extraction is reported for the first time. Al O is embedded in a polymer matrix followed by an in situ metal-exchange process to obtain a layered double hydroxide-Al O -polymer mixed-matrix disk with excellent flow-through properties. The extraction performance of the prepared disks is evaluated as a proof of concept for the automated extraction using sequential injection analysis of organic acids (p-hydroxybenzoic acid, 3,4-dihydroxybenzoic acid, gallic acid) following an anion-exchange mechanism. After the solid-phase extraction, phenolic acids were quantified by reversed-phase high-performance liquid chromatography with diode-array detection using a core-shell silica-C18 stationary phase and isocratic elution (acetonitrile/0.5% acetic acid in pure water, 5:95, v/v). High sensitivity and reproducibility were obtained with limits of detection in the range of 0.12-0.25 μg/L (sample volume, 4 mL), and relative standard deviations between 2.9 and 3.4% (10 μg/L, n = 6). Enrichment factors of 34-39 were obtained. Layered double hydroxide-Al O -polymer mixed-matrix disks had an average lifetime of 50 extractions. Analyte recoveries ranged from 93 to 96% for grape juice and nonalcoholic beer samples.

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supporting

confidence: 86%

“…Figure shows an illustration of the system used for an automated SPE , as well as the preparation of a LDH–Al 2 O 3 –MMD for their subsequent use as a SPE disk. The first step of the sorbent preparation procedure is based on the entrapment of Al 2 O 3 particles in PVDF shaping an Al 2 O 3 –MMD.…”

Section: Resultsmentioning

confidence: 99%

Automated solid‐phase extraction of phenolic acids using layered double hydroxide–alumina–polymer disks

Ghani

Cabello

Saraji

et al. 2018

J of Separation Science

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“…An alternative approach is to preconcentrate the analyte within the LOV flowcell and monitor the product directly on the surface of the sorbent, as described in the solid phase spectrophotometric LOV method of Santos et al [18] for the determination of Cd, Zn and Cu in freshwater samples. However, monitoring fluorescence emission directly on the surface of a sorbent is a challenging task, especially for ultra trace determinations.…”

Section: Graphical Abstractmentioning

confidence: 99%

Determination of trace zinc in seawater by coupling solid phase extraction and fluorescence detection in the Lab-On-Valve format

Grand

Chocholouš

Ruzicka

et al. 2016

Analytica Chimica Acta

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By virtue of their compactness, long-term stability, minimal reagent consumption and robustness, miniaturized sequential injection instruments are well suited for automation of assays onboard research ships. However, in order to reach the sensitivity and limit of detection required for open-ocean determinations of trace elements, it is necessary to preconcentrate the analyte prior its derivatization and subsequent detection by fluorescence. In this work, a novel method for the determination of dissolved zinc (Zn) at subnanomolar levels in seawater is described. The proposed method combines, for

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“…Recently, extensive attention on areas such as healthcare, food safety and environmental monitoring are causing a strong demand for monitoring tools with effectiveness, convenience and quick response . The existing monitoring tools mainly include atomic emission spectrometry (AES) , fluorimetry , and catalytic spectrophotometry . However, these methods must be conducted in a hospital or laboratory with analysers, revealing problems such as complex sample transportation and administration, more substantial time requirements, and high management costs .…”

Section: Introductionmentioning

confidence: 99%

Detection of Multiple Samples Based on AlGaN/GaN High Electron Mobility Transistors and Magnetic Microbeads

Wang

Miao

et al. 2019

Electroanalysis

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Semiconductor biochemical sensors are regarded as robust tools for the detection of various targets. However, re‐use of these sensors is one of the major obstacles hindering further development. To address this problem, a multi‐objective platform was developed based on magnetic beads and the AlGaN/GaN high electron mobility transistor (MBs AlGaN/GaN HEMT) device. Since the magnetic beads are capable of being fixed and released by inductance coils, the platform enables repeatability and multi‐objectivity during testing. To validate the advantages of the platform, metal ions and prostate specific antigen (PSA) were used. In this study, a platform sensing biochemical responses with a sensor was demonstrated to show the characteristics of reusability, multi‐target sensing, and simplicity, resulting in its promising prospects for widespread applications.

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Micro solid phase spectrophotometry in a sequential injection lab-on-valve platform for cadmium, zinc, and copper determination in freshwaters

Cited by 32 publications

References 37 publications

Automated solid‐phase extraction of phenolic acids using layered double hydroxide–alumina–polymer disks

Automated solid‐phase extraction of phenolic acids using layered double hydroxide–alumina–polymer disks

Determination of trace zinc in seawater by coupling solid phase extraction and fluorescence detection in the Lab-On-Valve format

Detection of Multiple Samples Based on AlGaN/GaN High Electron Mobility Transistors and Magnetic Microbeads

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