The fate of Cr(VI) in contaminated aquifers 65 years after the first spillage of plating solutions: A δ53Cr study at four Central European sites

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F17%3A00000181" target="_blank" >RIV/00025798:_____/17:00000181 - isvavai.cz</a>

Result on the web

<a href="http://www.sciencedirect.com/science/article/pii/S0341816217302370" target="_blank" >http://www.sciencedirect.com/science/article/pii/S0341816217302370</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.catena.2017.07.004" target="_blank" >10.1016/j.catena.2017.07.004</a>

Result language

angličtina

Original language name

The fate of Cr(VI) in contaminated aquifers 65 years after the first spillage of plating solutions: A δ53Cr study at four Central European sites

Original language description

Chromium isotope systematics and concentrations of dissolved Cr were studied in shallow aquifers at four industrial sites in the Czech Republic, Central Europe. Chromium plating baths and wastewaters started to contaminate groundwater in the late 1940s. Since plating shops at all sites still operate, it was possible to determine the δ53Cr signatures of the plating baths. The mean δ53Cr values of the Cr plating baths, representing contamination sources, were 0.0 ‰ at Zlate Hory (ZH), 0.5 ‰ at Loucna nad Desnou (LD), 0.3 ‰ at Letnany (AV), and 0.1 ‰ at Velesin (JI). At all sites, groundwater Cr was isotopically heavier, compared to the contamination source, reflecting natural in-situ Cr(VI) reduction to insoluble Cr(III). The magnitude of the average positive isotope shift from the plating bath Cr(VI) to groundwater Craq, mostly residual Cr(VI), was 1.1 ‰, 1.3 ‰, 3.3 ‰ and 3.3 ‰ at ZH, LD, AV, and JI, respectively. The mean concentration of Craq was 0.43, 0.47, 2.38 and 4.32 mg L-1, respectively. AV and JI, the sites with lower residual Craq concentrations in groundwater, had higher δ53Cr values, suggesting higher rates/efficiency of Cr(VI) reduction, and of toxicity removal. Simple Rayleigh models indicated that as much as 60 % of Cr(VI) has been removed from the groundwater by spontaneous reduction at AV and JI. At ZH and LD, the same models indicated a 30 % Cr removal from the solution. Even if uncertainties in model application and Cr fractionation factors are considered, it appears that natural attenuation at Cr(VI)-polluted sites can improve groundwater quality by tens of percent in a relatively short period of time of several decades.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10618 - Ecology

Project

<a href="/en/project/GA15-21373S" target="_blank" >GA15-21373S: Isotope mass balance for chromium-contaminated sites based on 53Cr/52Cr ratios of solid and liquid samples</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Catena

ISSN

0341-8162

e-ISSN

—

Volume of the periodical

158

Issue of the periodical within the volume

November

Country of publishing house

DE - GERMANY

Number of pages

10

Pages from-to

371-380

UT code for WoS article

000412252200034

EID of the result in the Scopus database

2-s2.0-85026389493