A review of chemical speciation techniques used for predicting dissolved copper bioavailability in seawater

2020 ◽  
Vol 17 (7) ◽  
pp. 469
Author(s):  
Paula Sánchez-Marín
Keyword(s):  
Chemical Speciation ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Coastal Areas ◽  
Toxicity Tests ◽  
Critical Examination ◽  
Dissolved Metals ◽  
Aquatic Life ◽  
Free Ion ◽  
Cu Bioavailability

Environmental contextCopper (Cu) is a metal of ecotoxicological concern in contaminated coastal areas. Cu present as the free ion is considered the most bioavailable fraction of the metal, and there is a need for the correct measurement or estimation of free Cu-ion concentrations in seawater. I review studies that have combined a biological measure of Cu bioavailability with chemical speciation measurements, and critically assess the ability of current methods to predict Cu bioavailability in contaminated coastal ecosystems. AbstractCopper (Cu) is an essential metal, but it is also toxic at concentrations reached in polluted coastal areas. In seawater, the speciation of this metal is largely controlled by the presence of dissolved organic matter (DOM), which binds Cu ions decreasing the concentration of inorganic and free forms of the metal. This is important to aquatic life, given that the bioavailability of dissolved metals is generally expected to be determined by the free ion concentration according to bioavailability models such as the free ion activity model and biotic ligand model (FIAM/BLM). The analytical determination of free metal concentrations in seawater is a challenging task that is needed (in combination with toxicity tests or other means of testing bioavailability) in order to test the applicability of the FIAM/BLM in particular systems and also for its application in monitoring and risk assessment of metals. This review summarises the studies that combine a biological measure of Cu bioavailability with the use of a chemical speciation technique for the measurement of Cu speciation in seawater, and it presents a critical examination of the results of those studies in order to determine which techniques are more suitable for the prediction of Cu bioavailability in seawater and to highlight research needs in the field. The technique showing the highest level of agreement with bioavailability data is anodic stripping voltammetry (ASV). Cathodic stripping voltammetry (CSV), aluminium hydroxide coated exchange resin (ALSA), and diffusion gradients in thin films (DGT) are also promising in this regard, although DGT slightly overestimates bioavailable Cu. More research is needed comparing the performance of different chemical speciation techniques with Cu bioavailability in seawater, especially at environmentally relevant concentrations of Cu.

Correlation of microplastic type and metal association: Croatian coast case study (Žirje Island)

2021 ◽  
Author(s):  
Hana Fajković ◽  
Neven Cukrov ◽  
Željko Kwokal ◽  
Kristina Pikelj ◽  
Laura Huljek ◽  
...  
Keyword(s):  
Metal Concentration ◽  
Anodic Stripping Voltammetry ◽  
Sampling Site ◽  
Mesh Size ◽  
Standard Addition ◽  
Stripping Voltammetry ◽  
Average Concentration ◽  
Dissolved Metals ◽  
Metal Concentrations ◽  
Pristine Area

<p>The aim of the study was to determine the correlation of metals on floating marine litter and weathered microplastic samples from the pristine area. Sampled were collected from the accumulated material on the natural beach in Mala Stupica Cove (Žirje Island, Croatia) in June 2020. In addition to weathered microplastic, the concentrations of dissolved metals in the seawater, at the same location were determined. According to these measurements, the sampling site can be considered pristine, with Cd and Pb concentrations as background values and Zn and Cu as elements that have no toxic effect, based on the classification proposed by Bakke et al., (2010). The metals of interest due to their high toxicity were Zn, Cd, Pb, and Cu.</p><p>After sampling, the collected material was sieved through a metal sieve with a 4 mesh size, resulting in 4 subsamples (>4 mm; 4-2 mm; 2-1 mm; 1-0.250 mm). The type of plastic particles from subsample >4 mm was determined by FTIR spectroscopy performed on Bruker Tensor 27 in the region from 400-4000 cm<sup>-1</sup>. On such defined particles and in the seawater sample, trace metal concentrations were determined by the electrochemical method differential pulse anodic stripping voltammetry (DPASV) with standard addition method by Metrohm Autolab modular potentiostat/galvanostat Autolab PGSTAT204. A static mercury drop electrode (SMDE) was used as the working electrode.</p><p>Plastic particles were isolated from additional two fractions (2-1 mm and 1-0.250 mm) as bulk samples, but without polystyrene, and the metal concentration was also determined using the same method. Due to the particle size, the type of plastic was not determined. Additional analyzes of metal concentrations on a defined and isolated polystyrene particles (PS) from a subsample (4-2 mm) and (2-1 mm) were also performed.</p><p>By analogy with sediment particles, one would expect smaller microplastic particles to have higher metal concentrations due to their larger specific surface area, but this was not observed in this study. The metal concentration varied with the type of plastic, and from the observed results, plastics could be ranked according to their affinity for the analyzed metals, as follows: polystyrene (PS)>Polypropylene (PP)>Low-density polyethylene (LDPE). According to an average concentration of all analyzed samples defined as LDPE, Zn could be single out as an element with around 7-time higher affinity for LDPE than other elements (Cd, Pb, and Cu). For samples defined as PP, the highest affinity is observed for Pb, even 30 times higher than in LDPE, followed by Zn and Cu, while Cd has similar values as in LDPE.  For PS samples affinity of all elements is higher in comparison with the LDPE and PP, as follows: Pb>Cu> Zn>Cd, with a concentration of Pb 2.5 times higher than in PP and even 88 times higher than in LDPE.</p><p> A general conclusion could be drawn, but the observed wide ranges indicate the need for additional research to determine the relationship between the degree and type of weathering with the associated metals.</p><p>This work has been fully supported by Croatian Science Foundation under the project lP-2019-04-5832.</p>

The Fate of Some Metal Species: Lead, Cadmium, Zinc in Surface Water, during Biological Sand Filtration – Effect of Preozonation

1982 ◽  
Vol 14 (6-7) ◽  
pp. 641-653
Author(s):  
F Erb ◽  
D Delabre ◽  
J C L'Hopitault ◽  
A Philippo ◽  
P Thomas ◽  
...  
Keyword(s):  
Surface Water ◽  
Biological Treatment ◽  
Anodic Stripping Voltammetry ◽  
Chemical Species ◽  
Stripping Voltammetry ◽  
Absorption Spectrometry ◽  
Metal Species ◽  
Raw Water ◽  
Sand Filtration ◽  
Dissolved Metals

This study was performed to determine the elimination of the different chemical species of some toxic metals - zinc, lead, cadmium - during biological sand filtration on surface water containing humic material which is able to promote the complexation of metals. The effect of preozonation was examined. The metal speciation was realised by means of Atomic Absorption Spectrometry and Differential Pulse Anodic Stripping Voltammetry. The survey of organic matters was carried out by measuring TOC, UV absorption and fluorescence. The biological treatment of raw water is quite effective for the removal of particu-late metals. The data bring out an important decrease for dissolved metals - about 50 to 60 % with cadmium and lead - especially noteworthy for the labile complexed metals. The preozonation of raw water provides the redissolution of particulate cadmium and zinc which are converted to free metals and seem then to be more eliminated by biological filtration. Ozonation appears to improve the efficiency of biological treatment which usually gives higher yields of purification than floculation (aluminium sulfate) in the same conditions.

scholarly journals 8-Hydroxyquinoline-2-Carboxylic Acid as Possible Molybdophore: A Multi-Technique Approach to Define Its Chemical Speciation, Coordination and Sequestering Ability in Aqueous Solution

Biomolecules ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 930
Author(s):  
Katia Arena ◽  
Giuseppe Brancato ◽  
Francesco Cacciola ◽  
Francesco Crea ◽  
Salvatore Cataldo ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Chemical Speciation ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Essential Elements ◽  
Glass Electrode ◽  
Coordination Behavior ◽  
Spectrophotometric Titrations ◽  
High Concentrations

8-hydroxyquinoline-2-carboxylic acid (8-HQA) has been found in high concentrations (0.5–5.0 mmol·dm−3) in the gut of Noctuid larvae (and in a few other lepidopterans), in which it is proposed to act as a siderophore. Since it is known that many natural siderophores are also involved in the uptake and metabolism of other essential elements than iron, this study reports some results on the investigation of 8-HQA interactions with molybdate (MoO42−, i.e., the main molybdenum form in aqueous environments), in order to understand the possible role of this ligand as molybdophore. A multi-technique approach has been adopted, in order to derive a comprehensive set of information necessary to assess the chemical speciation of the 8-HQA/MoO42− system, as well as the coordination behavior and the sequestering ability of 8-HQA towards molybdate. Chemical speciation studies have been performed in KCl(aq) at I = 0.2 mol·dm−3 and T = 298.15 K by ISE-H+ (glass electrode) potentiometric and UV/Vis spectrophotometric titrations. CV (Cyclic Voltammetry), DP-ASV (Differential Pulse-Anodic Stripping Voltammetry), ESI-MS experiments and quantum mechanical calculations have been also performed to derive information about the nature and possible structure of species formed. These results are also compared with those reported for the 8-HQA/Fe3+ system in terms of chemical speciation and sequestering ability of 8-HQA.

Chemical Speciation of Dissolved Copper in Saginaw Bay, Lake Huron, with Square Wave Anodic Stripping Voltammetry

2002 ◽  
Vol 28 (3) ◽  
pp. 466-478 ◽  
Author(s):  
Ali Bazzi ◽  
John T. Lehman ◽  
Jerome O. Nriagu ◽  
Donna Hollandsworth ◽  
Nicholas Irish ◽  
...  
Keyword(s):  
Chemical Speciation ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Lake Huron ◽  
Saginaw Bay ◽  
Square Wave ◽  
Anodic Stripping

scholarly journals Facile Synthesized Novel Nanocomposites Modified Electrodes in the Trace Detection of Sulfamethoxazole

2021 ◽  
Author(s):  
Jongte Lalmalsawmi ◽  
Diwakar Tiwari
Keyword(s):  
Electrochemical Impedance ◽  
Anodic Stripping Voltammetry ◽  
Modified Electrodes ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Nanocomposite Material ◽  
The Novel ◽  
Trace Detection ◽  
Aquatic Life ◽  
Trace Measurement

Abstract Micro-pollutants, especially antibiotics contamination in water bodies, are a serious concern, and their detection at a low level is important for human health and even aquatic life at large. The present investigation aims to obtain the novel nanocomposite material precursor to clay and silane. The nanocomposite material is decorated with Ag or Au nanoparticles as obtained indigenously by a green route using natural phytochemicals. The materials were extensively characterized by advanced analytical methods. The nanocomposite materials (Ag(NP)/TCBN and Au(NP)/TCBN) are employed in the selective and efficient trace measurement of sulfamethoxazole (SMZ) in aqueous solutions using the differential pulse anodic stripping voltammetry. The cyclic voltammetric and electrochemical impedance spectroscopic methods showed an increased electroactive surface area as well as faster electron transfer reactions compared to the glassy carbon electrode (GCE). The DPASV measurements at the concentration range of 0.25 mg/L to 30.0 mg/L showed that the novel nanocomposites provide the LOD of 0.022 and 0.036 mg/L, respectively, for the Ag(NP)/TCBN/GCE and Au(NP)/TCBN/GCE for sulfamethoxazole. Further, the application of the method for the detection of sulfamethoxazole in real water samples resulted in an acceptable recovery percentage of 93.08 to 103.7.

Development of a deep-sea mercury sensor using in situ anodic stripping voltammetry

2015 ◽  
Vol 49 (6) ◽  
pp. 613-620 ◽  
Author(s):  
Masahiro Yamamoto ◽  
Hitoshi Kodamatani ◽  
Yuriko Kono ◽  
Akinori Takeuchi ◽  
Ken Takai ◽  
...  
Keyword(s):  
Deep Sea ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Anodic Stripping ◽  
Mercury Sensor

Voltammetric Detection of Tetrodotoxin Real-Time In Vivo of Mouse Organs using DNA-Immobilized Carbon Nanotube Sensors

2019 ◽  
Vol 15 (5) ◽  
pp. 567-574
Author(s):  
Huck Jun Hong ◽  
Suw Young Ly
Keyword(s):  
Carbon Nanotube ◽  
Real Time ◽  
Anticancer Agents ◽  
Cancer Metastasis ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Takifugu Rubripes ◽  
In Vivo Detection ◽  
Voltammetric Detection

Background: Tetrodotoxin (TTX) is a biosynthesized neurotoxin that exhibits powerful anticancer and analgesic abilities by inhibiting voltage-gated sodium channels that are crucial for cancer metastasis and pain delivery. However, for the toxin’s future medical applications to come true, accurate, inexpensive, and real-time in vivo detection of TTX remains as a fundamental step. Methods: In this study, highly purified TTX extracted from organs of Takifugu rubripes was injected and detected in vivo of mouse organs (liver, heart, and intestines) using Cyclic Voltammetry (CV) and Square Wave Anodic Stripping Voltammetry (SWASV) for the first time. In vivo detection of TTX was performed with auxiliary, reference, and working herring sperm DNA-immobilized carbon nanotube sensor systems. Results: DNA-immobilization and optimization of amplitude (V), stripping time (sec), increment (mV), and frequency (Hz) parameters for utilized sensors amplified detected peak currents, while highly sensitive in vivo detection limits, 3.43 µg L-1 for CV and 1.21 µg L-1 for SWASV, were attained. Developed sensors herein were confirmed to be more sensitive and selective than conventional graphite rodelectrodes modified likewise. A linear relationship was observed between injected TTX concentration and anodic spike peak height. Microscopic examination displayed coagulation and abnormalities in mouse organs, confirming the powerful neurotoxicity of extracted TTX. Conclusion: These results established the diagnostic measures for TTX detection regarding in vivo application of neurotoxin-deviated anticancer agents and analgesics, as well as TTX from food poisoning and environmental contamination.

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