Analytical methods for determination of free metal ion concentration, labile species fraction and metal complexation capacity of environmental waters: A review

Pesavento, Maria; Alberti, Giancarla; Biesuz, Raffaela

doi:10.1016/j.aca.2008.10.046

Cited by 200 publications

(121 citation statements)

References 126 publications

Supporting

Mentioning

115

Contrasting

Unclassified

Order By: Relevance

“…Although the use of Hg is regulated in many countries, it is still used in several domestic and industrial applications, which has led to the accumulation of Hg residues in landfills, soils, and streams (Seco-Reigosa et al, 2014). As a result, the focus of numerous investigations has been on closely monitoring Hg present in the environment (Pesavento et al, 2009). Standard methods for Hg analysis include: cold vapor atomic absorption spectrometry (CVAAS) (EPA, 2007a) and inductively coupled plasma-mass spectrometry (ICP-MS) (EPA, 2007b).…”

Section: Introductionmentioning

confidence: 99%

Highly Selective Mercury Detection at Partially Oxidized Graphene/Poly(3,4-Ethylenedioxythiophene):Poly(Styrenesulfonate) Nanocomposite Film-Modified Electrode

et al. 2014

View full text Add to dashboard Cite

Partially oxidized graphene flakes (po-Gr) were obtained from graphite electrode by an electrochemical exfoliation method. As-produced po-Gr flakes were dispersed in water with the assistance of poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate) (PEDOT:PSS). The po-Gr flakes and the po-Gr/PEDOT:PSS nanocomposite (po-Gr/PEDOT:PSS) were characterized by Raman spectroscopy, Fourier transform-infrared spectroscopy (FT-IR), UV-Vis spectroscopy, X-ray diffraction (XRD), and scanning electron microscopy (SEM). In addition, we demonstrated the potential use of po-Gr/PEDOT:PSS electrode in electrochemical detection of mercury ions (Hg 2+ ) in water samples. The presence of po-Gr sheets in PEDOT:PSS film greatly enhanced the electrochemical response for Hg 2+ . Cyclic voltammetry measurements showed a well-defined Hg 2+ redox peaks with a cathodic peak at 0.23V, and an anodic peak at 0.42V. Using differential pulse stripping voltammetry, detection of Hg 2+ was achieved in the range of 0.2-14 µM (R 2 = 0.991), with a limit of detection of 0.19 µM for Hg 2+ . The electrode performed satisfactorily for sensitive and selective detection of Hg 2+ in real samples, and the po-Gr/PEDOT:PSS film remains stable on the electrode surface for repeated use.Therefore, our method is potentially suitable for routine Hg 2+ sensing in environmental water samples.

show abstract

Section: Introductionmentioning

confidence: 99%

Highly Selective Mercury Detection at Partially Oxidized Graphene/Poly(3,4-Ethylenedioxythiophene):Poly(Styrenesulfonate) Nanocomposite Film-Modified Electrode

et al. 2014

View full text Add to dashboard Cite

show abstract

“…Some excellent papers on methods for determining free metal ion concentration, labile species fraction, metal complexation capacity in waters, and sediment flux have been published [218,[249][250][251][252][253][254][255][256][257][258][259][260][261][262]. A wide range of biomimetic approaches exists [263].…”

Section: Tools For Experimental Designsmentioning

confidence: 99%

Assessing contaminated sediments in the context of multiple stressors

Burton

Johnston

2010

Enviro Toxic and Chemistry

145

View full text Add to dashboard Cite

Abstract-Sediments have a major role in ecosystem functioning but can also act as physical or chemical stressors. Anthropogenic activities may change the chemical constituency of sediments and the rate, frequency, and extent of sediment transport, deposition, and resuspension. The importance of sediments as stressors will depend on site ecosystem attributes and the magnitude and preponderance of co-occurring stressors. Contaminants are usually of greater ecological consequence in human-modified, depositional environments, where other anthropogenic stressors often co-occur. Risk assessments and restoration strategies should better consider the role of chemical contamination in the context of multiple stressors. There have been numerous advances in the temporal and spatial characterization of stressor exposures and quantification of biological responses. Contaminated sediments causing biological impairment tend to be patchy, whereas more pervasive anthropogenic stressors, such as alterations to habitat and flow, physical disturbance, and nutrient addition, may drive large-scale ecosystem responses. A systematic assessment of relevant ecosystem attributes and reference conditions can assist in understanding the importance of sediments in the context of other stressors. Experimental manipulations then allow for the controlled study of dominant stressors and the establishment of causal links. This approach will result in more effective management of watersheds and waterways. Environ. Toxicol. Chem. 2010;29:262529: -264329: . # 2010

show abstract

“…[5,6] Chemical speciation can be determined analytically and, in principle at least, this is the most reliable approach. However, direct measurements require considerable effort, either in terms of sampling and laboratory analysis [7] or in the development and maintenance of in situ techniques, [8] and of course cannot provide predictions of future conditions. To address these limitations, therefore, chemical speciation modelling is an essential complementary activity, offering the possibility to address 'what if ' questions, and explain current conditions and forecast future ones, at different spatial scales.…”

Section: Introductionmentioning

confidence: 99%

Metal speciation from stream to open ocean: modelling v. measurement

Tipping¹,

Lofts²,

Stockdale³

2016

Environ. Chem.

View full text Add to dashboard Cite

Environmental context. The chemical speciation of metals strongly influences their transport, fate and bioavailability in natural waters. Analytical measurement and modelling both play important roles in understanding speciation, while modelling is also needed for prediction. Here, we analyse a large set of data for fresh waters, estuarine and coastal waters, and open ocean water, to examine how well measurements and modelling predictions agree.Abstract. We compiled a data set of ,2000 published metal speciation measurements made on samples of fresh waters, estuarine and coastal waters, and open ocean waters. For each sample, we applied the chemical speciation model WHAM7 to calculate the equilibrium free metal ion concentrations, [M] (mol L À1 ), amounts of metal bound by dissolved organic matter (DOM), n (mol g À1 ), and their ratio n/[M] (L g À1 ), which is a kind of 'local' partition coefficient. Comparison of the measured and predicted speciation variables for the whole data set showed that agreements are best for fresh waters,

show abstract

Analytical methods for determination of free metal ion concentration, labile species fraction and metal complexation capacity of environmental waters: A review

Cited by 200 publications

References 126 publications

Highly Selective Mercury Detection at Partially Oxidized Graphene/Poly(3,4-Ethylenedioxythiophene):Poly(Styrenesulfonate) Nanocomposite Film-Modified Electrode

Highly Selective Mercury Detection at Partially Oxidized Graphene/Poly(3,4-Ethylenedioxythiophene):Poly(Styrenesulfonate) Nanocomposite Film-Modified Electrode

Assessing contaminated sediments in the context of multiple stressors

Metal speciation from stream to open ocean: modelling v. measurement

Contact Info

Product

Resources

About