On-line arsenic co-precipitation on ethyl vinyl acetate turning-packed mini-column followed by hydride generation-ICP OES determination

Gil, Raúl A.; Ferrúa, N.; Salonia, José A.; Olsina, Roberto A.; Martínez, Luis D.

doi:10.1016/j.jhazmat.2006.09.051

Cited by 56 publications

(39 citation statements)

References 31 publications

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“…The total arsenic concentration in a leaching solution was measured by an iCAP 6300 inductance-coupling plasma (ICP) emission spectrometer (Thermo Fisher Scientific; USA), following the procedure as described in previous studies (Gil et al 2007;Lopes et al 2009). Different forms of arsenic concentration in the solution after leaching were measured by a liquid chromatography-atomic fluorescence spectrometer (LC-AFS) model 9700 (Beijing Haiguang Instrument Co., Ltd.).…”

Section: Analysis Methodsmentioning

confidence: 99%

Arsenite and arsenate leaching and retention on iron (hydr)oxide-coated sand column

et al. 2015

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Purpose Arsenite and arsenate leaching from iron (hydr)oxides is one major parameter affecting the mobility of arsenic in the natural environment. In the process of arsenic transfer to groundwater, the retention capacity of arsenic by different iron (hydr)oxides needs to be investigated. The aim of this study is to determine the retention capacity of arsenite or arsenate from the ferrihydrite, lepidocrocite, or magnetite-coated sand column in the leaching process as well as the influence factors on leaching. Materials and methods The leaching of arsenite and arsenate from columns loaded with ferrihydrite, magnetite, or lepidocrocite-coated quartz sand was examined, and the influence factors such as pH, phosphate, and humic acid (HA) contents on leaching and retention were also investigated. Results and discussion The retention performance of As(III) and As(V) depended on the type of iron (hydr)oxides: ferrihydrite>magnetite>lepidocrocite. The retention capacities of As(III) and As(V) by amorphous ferrihydrite versus magnetite and lepidocrocite are 3.25, 5.63 (As(III)) and 1.75, 3.65 (As(V)) times higher. The retention capacity of arsenic is largely affected by the pH of leaching solutions. The retention of As(III) by ferrihydrite is efficient in near-neutral or slightly acidic environments. The addition of phosphate or HA significantly affected the leaching and retention. The addition of phosphate severely inhibited the leaching and retention of As(III) and As(V) by ferrihydrite, and the inhibitory effect was more obvious along with the increase of phosphate concentration. The retention of As(III) and As(V) by ferrihydrite was significantly enhanced by the addition of low-dose HA but was inhibited by the addition of excessive HA. Conclusions Retention performance of As(III) and As(V) from a ferrihydrite-coated sand column is greater than a magnetite-or a lepidocrocite-coated sand column, and the influence factors such as pH, phosphate, and HA affect the leaching and retention of As(III) and As(V). The results theoretically underlie the application of iron (hydr)oxide in arsenic pollution control.

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Section: Analysis Methodsmentioning

confidence: 99%

Arsenite and arsenate leaching and retention on iron (hydr)oxide-coated sand column

et al. 2015

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“…In general, Optical Emission Spectroscopy (OES) can assist the analysis of environmental trace pollutants, such as heavy metals, trace materials and air toxics. OES allows low detection limits and has found wide applications in the determination of trace levels of arsenic combined with atomic absorption spectrometry (Näykki, et al, 2001), atomic fluorescence spectrometry (AFS) (Leal et al, 2004) or coupled with optical emission spectroscopy-inductively coupled plasma (ICP-OES) (Anthemidis et al, 2006;Gil et al, 2007). Moreover, correlation between the OES plasma composition and the diamond film properties was also studied by Vandevelde et al (1999) during microwave PA-CVD with nitrogen addition.…”

Section: Introductionmentioning

confidence: 99%

Optical Emission Spectroscopy in Cooking Exhaust from a Wet Scrubber/Atmospheric Plasma Reactor

Liao

Chang

et al. 2014

Aerosol Air Qual. Res.

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This study introduced a self-developed wet scrubber/plasma reactor (WSB/PR) system to treat cooking fumes, and measured the changes in the optical emissions spectra (OES), before and after treatment using OES, in order to understand the changes of OES in a gaseous phase from waste gas. In terms of operational parameters of the experiment, the scrubbing solution used in WSB was tap water and an enzyme scrubbing solution, and atmospheric pressure plasma was applied inside PR. Furthermore, five different output powers (0.112 kJ/m 3 , 0.129 kJ/m 3 , 0.138 kJ/m 3 , 0.146 kJ/m 3 , and 0.156 kJ/m 3 ) were utilized to conduct experiments. The experimental results showed that, through the operations of five different plasma output powers, active species C, C 2 , CH, N, Hγ, N 2 , N 2 + , NO, C + , NH, O 2 + , H 2 , and O can be tested under the following three situations: (i) start PR (plasma background value) without importing cooking fumes; (ii) cooking fumes pass through WSB/PR; and (iii) cooking fumes pass through ESB/PR. When cooking fumes are treated with WSB/PR, light emission intensity intensifies with increased plasma power, from 0.112 kJ/m 3 to 0.146 kJ/m 3 . The same tendency occurs in the situation of cooking fumes treated with ESB/PR, which increases plasma power from 0.112 kJ/m 3 to 0.138 kJ/m 3 . In addition, the number of active species is reduced when plasma power is increased. This indicates that, electron energy is reduced due to the H 2 O decomposition function in the plasma reaction, which results in a decrease in the number of active species.

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“…Furthermore, if ignoring the Raman shift (that is, ω e ∼ω s , where ω e , ω s is frequency of the excitation light and Raman scattering light, respectively), the SERS EF due to the EM effect can be approximated [6] In experiments, the SERS EF can be estimated by [7] where I SERS , I Norm is the intensity of a specific characteristic peak in the SERS and normal Raman measurements, respectively; N SERS , N Norm is the number of molecules contributing to the Raman signal in the SERS and normal Raman measurements, respectively.…”

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confidence: 99%

“…49,50 For example, when the gap size decreases from 5.5 nm to 1 nm, the SERS enhancement will improve from ∼10 6 to 10 11 . [51][52][53][54][55] Consequently, when analyte molecules are adsorbed on "hot spots", SERS signals of the analyte can be enhanced by 10 6 or even up to 10 11 . 51,56,57 As a result, even a single molecule can be detected by SERS sensor.…”

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confidence: 99%

Review—Surface-Enhanced Raman Scattering Sensors for Food Safety and Environmental Monitoring

Tang

Zhu

Meng

et al. 2018

J. Electrochem. Soc.

167

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This article gives a review of surface-enhanced Raman scattering (SERS) sensors for food safety and environmental pollution monitoring. It introduces the basic concepts of SERS substrates, SERS enhancement factors and mechanisms, SERS probes/labels, molecular recognition elements as well as optofluidic SERS devices (SERS sensors integrated with microfluidics). This article places an emphasis on the design strategies of various SERS sensors by utilizing fingerprinting SERS spectra or by using SERS probes. It highlights the applications of SERS sensors in detection of heavy metals (such as Hg 2+ , Pb 2+ , Cd 2+ and As 3+ ), inorganic anions (nitrite, nitrate, perchlorate and fluoride), toxic small molecules (polycyclic aromatic hydrocarbon, polychlorinated biphenyls, herbicides, pesticides, antibiotics and food additives), as well as pathogens (bacteria and viruses Food safety and environment pollution are among great challenges in the human society. There are some common pollutants in the environment and food, such as heavy metals, nitrites, phosphates, pesticides, herbicides, antibiotics, hormone, pathogens and other additives. Some pollutants initially are released into the environment, and then accumulate in the food chain, and enter human bodies. Uptake of pollutants by human poses a threat to human health to different extents. 1,2Hence it is essential to monitor pollutants in the environment and food. Currently pollutants are typically measured with various laboratorybased techniques, such as atomic absorption spectroscopy, atomic fluorescence spectrometry, X-ray fluorescence spectrum, inductively coupled plasma and ion-coupled plasma-mass spectroscopy, mass spectrometry, chromatography, capillary electrophoresis, analytical profile index (API), polymerase chain reaction (PCR), and enzymelinked immunosorbent assay (ELISA).3-7 Although these techniques have high sensitivity and accuracy, they rely on expensive instruments and require professional to treat samples and operate instruments in centralized laboratories. Additionally, analysis generally takes several hours to days. For example, 0.024 ppb of Hg 2+ and 0.023 ppb of As 3+ in drinking water can be detected using atomic absorption spectroscopy with a two-step electrothermal atomizer and hydride generation atomic fluorescence spectrometry, respectively. 8,9 However, they need multiple sample preconcentration processing and expensive instruments. PCR can improve the number of the target while ELISA can produce amplified recognition signal, which could both improve the detection sensitivity to pathogens. For example, oligonucleotide microarray with combination of CdSe/ZnS quantum dots as fluorescent labels shown high specificity and sensitivity of 10 colony forming units (CFU)/mL. 10 However, the complicated procedures are very time-consuming, and the method is also vulnerable to contamination. These laboratory-based techniques cannot meet the critical need of rapid on-site measurement of pollutants. Therefore, it is essential to develop portable sensors f...

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On-line arsenic co-precipitation on ethyl vinyl acetate turning-packed mini-column followed by hydride generation-ICP OES determination

Cited by 56 publications

References 31 publications

Arsenite and arsenate leaching and retention on iron (hydr)oxide-coated sand column

Arsenite and arsenate leaching and retention on iron (hydr)oxide-coated sand column

Optical Emission Spectroscopy in Cooking Exhaust from a Wet Scrubber/Atmospheric Plasma Reactor

Review—Surface-Enhanced Raman Scattering Sensors for Food Safety and Environmental Monitoring

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