Oral bioaccessibility of inorganic contaminants in waste dusts generated by laterite Ni ore smelting

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F18%3A10393061" target="_blank" >RIV/00216208:11310/18:10393061 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1007/s10653-016-9875-4" target="_blank" >https://doi.org/10.1007/s10653-016-9875-4</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10653-016-9875-4" target="_blank" >10.1007/s10653-016-9875-4</a>

Result language

angličtina

Original language name

Oral bioaccessibility of inorganic contaminants in waste dusts generated by laterite Ni ore smelting

Original language description

The laterite Ni ore smelting operations in Niquelandia and Barro Alto (Goias State, Brazil) have produced large amounts of fine-grained smelting wastes, which have been stockpiled on dumps and in settling ponds. We investigated granulated slag dusts (n = 5) and fly ash samples (n = 4) with a special focus on their leaching behaviour in deionised water and on the in vitro bioaccessibility in a simulated gastric fluid, to assess the potential exposure risk for humans. Bulk chemical analyses indicated that both wastes contained significant amounts of contaminants: up to 2.6 wt% Ni, 7580 mg/kg Cr, and 508 mg/kg Co. In only one fly ash sample, after 24 h of leaching in deionised water, the concentrations of leached Ni exceeded the limit for hazardous waste according to EU legislation, whereas the other dusts were classified as inert wastes. Bioaccessible fractions (BAF) of the major contaminants (Ni, Co, and Cr) were quite low for the slag dusts and accounted for less than 2% of total concentrations. In contrast, BAF values were significantly higher for fly ash materials, which reached 13% for Ni and 19% for Co. Daily intakes via oral exposure, calculated for an adult (70 kg, dust ingestion rate of 50 mg/day), exceeded neither the tolerable daily intake (TDI) nor the background exposure limits for all of the studied contaminants. Only if a higher ingestion rate is assumed (e.g. 100 mg dust per day for workers in the smelter), the TDI limit for Ni recently defined by European Food Safety Authority (196 mu g/day) was exceeded (324 mu g/day) for one fly ash sample. Our data indicate that there is only a limited risk to human health related to the ingestion of dust materials generated by laterite Ni ore smelting operations if appropriate safety measures are adopted at the waste disposal sites and within the smelter facility.

Czech name

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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

10505 - Geology

Project

<a href="/en/project/GA13-17501S" target="_blank" >GA13-17501S: Reactivity of anthropogenic metal-bearing geomaterials in soils</a><br>

Continuities

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

Publication year

2018

Confidentiality

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

Name of the periodical

Environmental Geochemistry and Health

ISSN

0269-4042

e-ISSN

—

Volume of the periodical

40

Issue of the periodical within the volume

5

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

14

Pages from-to

1699-1712

UT code for WoS article

000452158700002

EID of the result in the Scopus database

2-s2.0-84987673732