Improved voltammetric methodology for chromium redox speciation in estuarine waters

Pađan, Jasmin; Marcinek, Saša; Cindrić, Ana Marija; Layglon, Nicolas; Lenoble, Véronique; Salaün, Pascal; Garnier, Cédric; Omanović, Dario

doi:10.1016/j.aca.2019.09.014

Cited by 21 publications

(11 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Under the conditions of small terrestrial and negligible anthropogenic input (Cindric et al, 2015;Legovic et al, 1994), photochemical and biological processes are expected to strongly affect DOM pool, while the permanent stratification could further influence DOM distribution and dynamics (Santinelli et al, 2013). While the Krka River estuary is in general well characterized on its hydrology, biological status and trace metals behavior (Cetinic et al, 2006;Cindric et al, 2015;Knežević et al, 2019;Legovic, 1991;Pađan et al, 2019a;Pađan et al, 2019b;Supraha et al, 2014;Svensen et al, 2007;Zutic and Legovic, 1987), the organic matter dynamics has been only sporadically studied and to the best of our knowledge, no information about CDOM and FDOM dynamics is reported. In this study, we investigated DOM dynamics in the Krka River estuary during two contrasting periods of the year; February 2019, characterized by low production and high riverine input…”

Section: Introductionmentioning

confidence: 99%

Dissolved organic matter dynamics in the pristine Krka River estuary (Croatia)

et al. 2020

Self Cite

View full text Add to dashboard Cite

In many estuarine systems, riverine discharge is the main source of dissolved organic matter (DOM). In contrast, karstic Krka River, with self-purifying ability, is characterized by very low DOM concentrations (~30 µM) and a diluting effect on DOM in the estuary. Interestingly, within the estuary a marked in-situ production is observed, particularly in summer. Pristine nature of the estuary makes it a natural laboratory to study the DOM dynamics, originated from 3 sources: the river the seawater and in-situ production. With this work we aim at reporting the first information on DOM dynamics in the Krka estuary in two contrasting seasons, winter and summer 2019. The quality of DOM was assessed using absorbance and fluorescence measurements coupled with PARAFAC analysis. During winter, the estuary is characterized by extremely low DOC concentrations, for which optical properties indicate that is mainly of terrestrial origin. In summer, due to the low riverine discharge and high temperature, DOC concentrations are higher than in winter and a marked increase in absorption and protein-like fluorescence is observed in the estuary. The permanent stratification determines DOC accumulation in the surface layer with values up to 147 µM, suggesting a decoupling between production and removal processes. Our work opens intriguing questions about the main processes responsible for DOC accumulation in this system and highlights the need of new studies combing chemical and biological information.

show abstract

Section: Introductionmentioning

confidence: 99%

Dissolved organic matter dynamics in the pristine Krka River estuary (Croatia)

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…Entry into seawater occurs either through natural [leaching from top soil and rocks] or anthropogenic sources [industrial establishments] (Oze et al, 2007;Tchounwou et al, 2012). Although their concentration in seawater remains very low [5.2 × 10 −6 mg/L -832 × 10 −6 mg/L], their toxic impact cannot simply be overlooked (Pađan et al, 2019). The determination of toxicity produced from such low concentrations of Cr (VI), along with a co-contaminant, such as nano-TiO 2 to marine organism is essential.…”

Section: Introductionmentioning

confidence: 99%

Combined effects of nano-TiO2 and hexavalent chromium towards marine crustacean Artemia salina

et al. 2020

View full text Add to dashboard Cite

There has been a significant increased concern of the impact of the toxicity of multiple contaminants in the marine environment. Thus, this study was aimed at determining whether the interaction between nano-TiO 2 and Cr(VI) would modulate their toxic effects with the marine crustacean, Artemia salina. Nano-TiO 2 agglomerated in artificial sea water (ASW) and readily formed micron-sized particles that settled down in the medium. The addition of Cr(VI) to nano-TiO 2 aggravated their agglomeration through sorption of Cr(VI) onto nano-TiO 2 . This was reflected by a decrease in the residual concentration of Cr in the suspension. Acute toxicity tests performed using pristine nano-TiO 2 (0.25, 0.5, 1, 2, and 4 mg/L) and Cr(VI) (0.125, 0.25, 0.5, and 1 mg/L) displayed a concentration dependent rise in the mortality of Artemia salina. To examine the effects of mixtures of nano-TiO 2 and Cr(VI) on Artemia salina, two groups of experiments were designed. The former group studied the toxic effect of nano-TiO 2 (0.5, 1, 2, and 4 mg/L) with a fixed concentration (0.125 mg/L) of Cr(VI). While the latter group studied the toxicity of Cr(VI) (0.25, 0.5, and 1 mg/L) with a fixed concentration (0.25 mg/L) of nano-TiO 2 . The toxic effects of nano-TiO 2 was not significantly reduced at a fixed concentration of Cr(VI) but in contrast, a significant reduction in the Cr(VI) toxicity by fixed concentration of nano-TiO 2 was observed. Toxicity data was well supported by an independent action model that proved the mode of action between nano-TiO 2 and Cr(VI) to be antagonistic. Furthermore, ROS generation and measurement of antioxidant enzyme activities were also in line with toxicity results. From this study, the modification of Cr(VI) toxicity at fixed concentration of nano-TiO 2 could have a huge impact on the reduction in Cr(VI) toxicity across trophic levels.

show abstract

“…Its environmental presence is related to industrial activities (e.g., tanneries, chromium ore processing plants, slag-soil systems or deposition of steel production waste on landfills) [7,[71][72][73][74]. In particular, Cr(VI) in natural water may occur in surface water near which chromite-bearing formations are observed [5] The differences in chromium speciation ratio (Cr(III)/Cr(VI)) may be a result of seasonal changes [75].…”

Section: Speciation Modeling Resultsmentioning

confidence: 99%

Inorganic Chromium Speciation in Geothermal Water of the Podhale Trough (Southern Poland) Used for Recreational Purposes

2020

View full text Add to dashboard Cite

The results of total chromium determination (by ICP-OES method) in samples collected from nine working wells named GW1–GW9, exploiting geothermal water from the Podhale Trough (southern part of Poland, near the Tatra Mountains), which is used for recreational purposes, were implemented for hydrogeochemical modeling to indicate dominating chromium speciation. The reliability of the results was determined by the application of a quality assurance/quality control program, both in the laboratory and during field work. Based on chromium speciation, the risk associated with the utilization of geothermal water was calculated. The outcome showed that the concentration of Cr(III) is almost equal to the total chromium concentration (1–2 µg∙L−1). Crtot concentrations were also used in a health risk assessment in the case of epidermal absorption (EDIderm) during bathing in thermal pools and four assumed scenarios in relation to the handling of geothermal water. The effect of the very low Crtot concentration in the analyzed water on health risk calculation was estimated as low (hazard quotient value <10−7). In the case of risk matrix analysis, the environmental risks were estimated as moderate, major and very severe, dependent on the assumed scenario.

show abstract

Improved voltammetric methodology for chromium redox speciation in estuarine waters

Cited by 21 publications

References 39 publications

Dissolved organic matter dynamics in the pristine Krka River estuary (Croatia)

Dissolved organic matter dynamics in the pristine Krka River estuary (Croatia)

Combined effects of nano-TiO2 and hexavalent chromium towards marine crustacean Artemia salina

Inorganic Chromium Speciation in Geothermal Water of the Podhale Trough (Southern Poland) Used for Recreational Purposes

Contact Info

Product

Resources

About