The Speciation of Aluminum in Environmental Samples

Namieśnik, Jacek; Rabajczyk, Anna

doi:10.1080/10408340903153234

Cited by 30 publications

(20 citation statements)

References 167 publications

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“…The results revealed that Al underwent to precipitation at pH>3.5 to 4.0 depending on its initial concentration (Figure A). The minimum solubility of Al was observed at the neutral pH where the dominant form of Al is the insoluble Al(OH) 3 0 . Al(OH) 3 0 dissolves in acidic or alkaline solutions making the investigation of Al adsorption more appropriate at the aforementioned solution conditions .…”

Section: Resultsmentioning

confidence: 99%

“…The minimum solubility of Al was observed at the neutral pH where the dominant form of Al is the insoluble Al(OH) 3 0 . Al(OH) 3 0 dissolves in acidic or alkaline solutions making the investigation of Al adsorption more appropriate at the aforementioned solution conditions . Up to 40%‐60% of dissolved Al returned to the solution as pH reached the values of 8.5 to 9.0.…”

Section: Resultsmentioning

confidence: 99%

“…[34,41] Al(OH) 3 0 dissolves in acidic or alkaline solutions making the investigation of Al adsorption more appropriate at the aforementioned solution conditions. [41] Up to 40%-60% of dissolved Al returned to the solution as pH reached the values of 8.5 to 9.0. The adsorption of Al on TiO 2 and VC was then investigated at pH 3.0, 4.0, and 9.0 ( Figure 1B).…”

Section: Effect Of Ph On the Solubility And Adsorptionmentioning

confidence: 99%

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Removal of aluminum from alkaline aqueous solution by adsorption on Degussa P25 TiO₂ and vermiculite concrete‐supported ferric oxyhydroxide

2019

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The current investigation on aluminum adsorption from an aqueous solution originated from the need to implement a water treatment technology that would decrease the prohibitive aluminum concentrations in the groundwater of the Khibiny Alkaline Massif (Kola Peninsula), which is limiting the use of this water source as a source for the household water supply in the area. TiO2 and vermiculite concrete‐supported ferric oxyhydroxide (VC) were used as adsorbents to remove aluminum from the alkaline aqueous solution, considering the water‐specific natural conditions of the Khibiny aquifer. The effects of pH, initial aluminum concentration, contact time, adsorbent dose, and ions present in Khibiny groundwater were investigated. The results showed that the adsorption kinetics followed the pseudo‐second order model, and the equilibrium data were described well by Langmuir and Freundlich isotherm models. The aluminum adsorption on TiO2 exhibited a dramatically higher adsorption rate compared to VC; the adsorption equilibrium was reached in 30 and 240 minutes, respectively, while the maximum TiO2 and VC adsorption capacities were similar and had values of 6.85 and 6.75 mg g−1 as the results of laboratory tests revealed. It was shown that when these two adsorbents worked jointly the capacity reached 8.28 mg g−1 within 60 minutes at pH 9.0. No apparent significant effects on aluminum removal by adsorbents tested in the presence of SO42−, NO3−, and Cl− were observed. The obtained outcomes identify a possible approach and reliable foundation for water treatment technology to solve the problem of elevated aluminum concentrations in the household water of the Khibiny Alkaline Massif area as well as within other locations where the solution of this problem can improve living conditions or industrial technologies.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Effect Of Ph On the Solubility And Adsorptionmentioning

confidence: 99%

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Removal of aluminum from alkaline aqueous solution by adsorption on Degussa P25 TiO₂ and vermiculite concrete‐supported ferric oxyhydroxide

2019

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“…(2)(3)(4) The environmental impact of Al is governed by its speciation rather than the total element concentration. (3,11) The monomeric forms of dissolved Al present at low pH (e.g. Al 3+ , Al(OH) 2+ and Al(OH) 2 + ) (1, 3,4,11) are considered toxic, whereas, complexation of dissolved Al species by organic matter has been shown to ameliorate toxicity.…”

Section: Introductionmentioning

confidence: 99%

“…Al 3+ , Al(OH) 2+ and Al(OH) 2 + ) (1, 3,4,11) are considered toxic, whereas, complexation of dissolved Al species by organic matter has been shown to ameliorate toxicity. (3,4,(12)(13)(14) The toxicity of Al(OH) 4 -, the dominant Al species present in alkaline waters, (1,3,4,11) remains unclear and evidence has been presented that both supports and rejects toxic effects. (4,(15)(16)(17)(18)(19) Generally, Al(OH) 4 is considered less toxic than the monomeric forms of Al.…”

Section: Introductionmentioning

confidence: 99%

DGT Measurement of Dissolved Aluminum Species in Waters: Comparing Chelex-100 and Titanium Dioxide-Based Adsorbents

Panther

Bennett

Teasdale

et al. 2012

Environ. Sci. Technol.

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Aluminum is acutely toxic, and elevated concentrations of dissolved Al can have detrimental effects on both terrestrial and aquatic ecosystems. Robust analytical methods that can determine environmentally relevant Al fractions accurately and efficiently are required by the environmental monitoring community. A simple, robust passive sampling method, the diffusive gradients in thin films (DGT) technique, was evaluated for the measurement of dissolved Al species in freshwater and marine water using either Chelex-100 or Metsorb (a titanium dioxide-based binding agent) as the adsorbent. Mass vs time DGT deployments at pH 5.05 (Al(3+) and Al(OH)(2+) dominate) and 8.35 (Al(OH)(4)(-) dominates) demonstrated linear uptake of Al (R(2) = 0.989 and 0.988, respectively) for Metsorb. Similar deployments of Chelex-DGT showed linear uptake at pH 5.05 (R(2) = 0.994); however, at pH 8.35 the mass of Al accumulated was 40-70% lower than predicted, suggesting that Chelex-100 is not suitable for Al measurements at high pH. The Metsorb-DGT measurement was independent of pH (5.0-8.5) and ionic strength (0.001-0.7 mol L(-1) NaNO(3)), whereas the Chelex-DGT measurement was only independent of ionic strength at pH 5.0. At pH 8.4, increasing ionic strength led to considerable underestimation (up to 67%) of Al concentration. Deployments of Metsorb-DGT (up to 4 days) in synthetic freshwater (pH range 5.4-8.1) and synthetic seawater (pH 8.15) resulted in linear mass uptakes, and the concentration measured by DGT agreed well with solution concentrations. Conversely, deployment of Chelex-DGT in synthetic seawater and freshwater (pH ≥7.7 Al(OH)(4)(-) dominant species) resulted in a decrease in accumulated mass with increasing deployment time. In situ field evaluations in fresh, estuarine, and marine waters confirmed that Metsorb-DGT was more accurate than Chelex-DGT for the measurement of dissolved Al in typical environmental waters.

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Flame and Graphite Furnace Atomic Absorption Spectrometry in Environmental Analysis

Sperling

2022

Encyclopedia of Analytical Chemistry

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Atomic absorption spectrometry (AAS) is a well‐established technique for the quantitative determination of elements in environmental materials at trace and ultratrace levels. AAS is an optical atomic spectrometric technique based on the measurement of the specific absorption originated from the free, unionized atoms in the gas phase. For transferring the analyte to free atoms, different types of atomizers are in use, out of which the flame and the graphite furnace are the most often used atomizers. Typical detection limits of flame AAS (FAAS) are of the order of 1–100 μg L −1 , making it a perfect tool for the determination of minor and trace elements, at least for contaminated samples. Graphite furnace AAS (GFAAS), offering detection limits which are about a factor of 20–200 lower than for FAAS, is the standard method for many trace elements especially for background values, and for unpolluted samples, such as freshwater and biological materials. AAS in its conventional configuration is a single element technique, which has to be used in a sequential mode when more than one element has to be determined. However, there are commercial instruments available, that can be used for the determination of six to eight elements simultaneously. While most manufacturers provide instruments working with line sources, one manufacturer has commercialized high‐resolution instruments working with continuum sources (HRCS‐AAS).

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The Speciation of Aluminum in Environmental Samples

Cited by 30 publications

References 167 publications

Removal of aluminum from alkaline aqueous solution by adsorption on Degussa P25 TiO₂ and vermiculite concrete‐supported ferric oxyhydroxide

Removal of aluminum from alkaline aqueous solution by adsorption on Degussa P25 TiO₂ and vermiculite concrete‐supported ferric oxyhydroxide

DGT Measurement of Dissolved Aluminum Species in Waters: Comparing Chelex-100 and Titanium Dioxide-Based Adsorbents

Flame and Graphite Furnace Atomic Absorption Spectrometry in Environmental Analysis

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The Speciation of Aluminum in Environmental Samples

Cited by 30 publications

References 167 publications

Removal of aluminum from alkaline aqueous solution by adsorption on Degussa P25 TiO2 and vermiculite concrete‐supported ferric oxyhydroxide

Removal of aluminum from alkaline aqueous solution by adsorption on Degussa P25 TiO2 and vermiculite concrete‐supported ferric oxyhydroxide

DGT Measurement of Dissolved Aluminum Species in Waters: Comparing Chelex-100 and Titanium Dioxide-Based Adsorbents

Flame and Graphite Furnace Atomic Absorption Spectrometry in Environmental Analysis

Contact Info

Product

Resources

About

Removal of aluminum from alkaline aqueous solution by adsorption on Degussa P25 TiO₂ and vermiculite concrete‐supported ferric oxyhydroxide

Removal of aluminum from alkaline aqueous solution by adsorption on Degussa P25 TiO₂ and vermiculite concrete‐supported ferric oxyhydroxide