Oral bioaccessibility of metal(loid)s in dust materials from mining areas of southern Namibia

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F19%3A73595560" target="_blank" >RIV/61989592:15310/19:73595560 - isvavai.cz</a>

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S0160412018323560" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0160412018323560</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.envint.2018.12.027" target="_blank" >10.1016/j.envint.2018.12.027</a>

Result language

angličtina

Original language name

Oral bioaccessibility of metal(loid)s in dust materials from mining areas of southern Namibia

Original language description

Ore mining and processing in semi-arid areas is responsible for the generation of metal(loid)-containing dust, which is easily transported by wind to the surrounding environment. To assess the human exposure to dust derived metal(loid)s (As, Cd, Cu, Pb, Sb, Zn), as well as the potential risks related to incidental dust ingestion, we studied mine tailing dust(n=8),slag dust(n=5) and smelter dust(n=4) from old mining and smelting sites in northern Namibia (Kombat, Berg Aukas, Tsumeb). In vitro bioaccessibility testing using extraction in simulated gastric fluid (SGF) was combined with determination of grain-size distributions, chemical and mineralogical characterization sand leaching tests conducted on original dust samples and separated PM10 fractions. The bulk and bioaccessible concentrations of the metal(loid)s were ranked as follows: mine tailing dusts &lt; slag dusts ≪ smelter dusts. Extremely high As and Pb bioaccessibilities in the smelter dusts were caused by the presence of highly soluble phases such as arsenolite (As2O3) and various metal-arsenates unstable under the acidic conditions of SGF. The exposure estimates calculated for an adult person of 70 kg at a dust ingestion rate of50mg/day indicated that As, Pb (and also Cd to a lesser extent) grossly exceeded tolerable daily intake limits for these contaminants in the case of slag and smelter dusts. The high risk for smelter dusts has been acknowledged, and the safety measures currently adopted by the smelter operator in Tsumeb are necessary to reduce the staff&apos;s exposure to contaminated dust. The exposure risk for the local population is only important at the unfenced disposal sites at Berg Aukas, where the PM10 exhibited high levels of bioaccessible Pb.

Czech name

—

Czech description

—

Type

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

CEP classification

—

OECD FORD branch

10511 - Environmental sciences (social aspects to be 5.7)

Project

<a href="/en/project/GA16-13142S" target="_blank" >GA16-13142S: Mining and processing of Cu, Pb, Zn and Co ores in Sub-Saharan Africa – natural geochemical laboratories for investigation of pollutant behaviours</a><br>

Continuities

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

Publication year

2019

Confidentiality

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

Name of the periodical

ENVIRONMENT INTERNATIONAL

ISSN

0160-4120

e-ISSN

—

Volume of the periodical

124

Issue of the periodical within the volume

MAR

Country of publishing house

US - UNITED STATES

Number of pages

11

Pages from-to

205-215

UT code for WoS article

000457122700021

EID of the result in the Scopus database

2-s2.0-85059839483