Chromium isotope fractionations resulting from electroplating, chromating and anodizing: Implications for groundwater pollution studies

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F17%3A43914730" target="_blank" >RIV/60461373:22310/17:43914730 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00025798:_____/17:00000165 RIV/60460709:41330/17:73836

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.apgeochem.2017.03.009" target="_blank" >http://dx.doi.org/10.1016/j.apgeochem.2017.03.009</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.apgeochem.2017.03.009" target="_blank" >10.1016/j.apgeochem.2017.03.009</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Chromium isotope fractionations resulting from electroplating, chromating and anodizing: Implications for groundwater pollution studies

Popis výsledku v původním jazyce

A number of shallow aquifers in industrial regions have been polluted by toxic Cr(VI). At some sites, spontaneous reduction of dissolved Cr(VI) to insoluble Cr(III) has been observed. Precipitation of nontoxic Cr(III) is accompanied by a Cr isotope fractionation, with the residual Cr(VI) becoming enriched in the heavier isotope Cr-53, and depleted in the lighter isotope Cr-52. Thus far, delta Cr-53 values of the contamination source have been poorly constrained. These values are needed to quantify the extent of Cr(VI) reduction in the aquifers. We present delta Cr-53 values of solutions generated during Cr-electroplating, chromating and anodizing at nine industrial sites. The source chemical, CrO3, had a mean delta Cr-53 of 0.0%(0). A small-to-negligible Cr isotope fractionation was observed between the solutions of the plating baths and the source chemical. Across all sample types, the mean delta Cr-53(VI) value was 0.2%(0). The mean delta Cr-53(VI) value of contaminated groundwater in the same region, studied previously, was significantly higher (2.9%o), indicating Cr(VI) reduction. Based on low delta Cr-53(VI) values of plating baths and rinsewaters as potential contamination sources, and their low variability, we suggest that most aquifer delta Cr-53(VI) values higher than 1.0%(0) are a result of in-situ Cr(VI) reduction. (C) 2017 Published by Elsevier Ltd.

Název v anglickém jazyce

Chromium isotope fractionations resulting from electroplating, chromating and anodizing: Implications for groundwater pollution studies

Popis výsledku anglicky

A number of shallow aquifers in industrial regions have been polluted by toxic Cr(VI). At some sites, spontaneous reduction of dissolved Cr(VI) to insoluble Cr(III) has been observed. Precipitation of nontoxic Cr(III) is accompanied by a Cr isotope fractionation, with the residual Cr(VI) becoming enriched in the heavier isotope Cr-53, and depleted in the lighter isotope Cr-52. Thus far, delta Cr-53 values of the contamination source have been poorly constrained. These values are needed to quantify the extent of Cr(VI) reduction in the aquifers. We present delta Cr-53 values of solutions generated during Cr-electroplating, chromating and anodizing at nine industrial sites. The source chemical, CrO3, had a mean delta Cr-53 of 0.0%(0). A small-to-negligible Cr isotope fractionation was observed between the solutions of the plating baths and the source chemical. Across all sample types, the mean delta Cr-53(VI) value was 0.2%(0). The mean delta Cr-53(VI) value of contaminated groundwater in the same region, studied previously, was significantly higher (2.9%o), indicating Cr(VI) reduction. Based on low delta Cr-53(VI) values of plating baths and rinsewaters as potential contamination sources, and their low variability, we suggest that most aquifer delta Cr-53(VI) values higher than 1.0%(0) are a result of in-situ Cr(VI) reduction. (C) 2017 Published by Elsevier Ltd.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10511 - Environmental sciences (social aspects to be 5.7)

Projekt

<a href="/cs/project/GA15-21373S" target="_blank" >GA15-21373S: Izotopová hmotová bilance lokalit znečištěných chrómem podle poměru četnosti 53Cr/52Cr pevných a kapalných vzorků</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Applied Geochemistry

ISSN

0883-2927

e-ISSN

—

Svazek periodika

80

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

9

Strana od-do

134-142

Kód UT WoS článku

000400219000010

EID výsledku v databázi Scopus

2-s2.0-85016482843