Organic matter decomposition before arsenic speciation analysis of water sample - "Soft decomposition" using nano-photocatalysts.
Chemosphere
; 207: 481-488, 2018 Sep.
Article
in En
| MEDLINE
| ID: mdl-29807347
ABSTRACT
The applicability of photolysis in the speciation analysis of arsenic is investigated. The use of nano scale semiconductors (Fe2O3/WO3/Fe2O3 at pH 6) as an active film during solar light irradiation of a water sample, containing some surfactants (SDS), results in the simplification of the organic matter and gives no speciation change in the arsenic. The reproducibility of active layer is shown to be high and the surface roughness of each photoactive sample and photocurrent do not differ by more than 6 and less than 8%, respectively. The procedure of sample pretreatment caused a minimum (8-10%) amount of speciation change, whilst the irradiation is no longer that 2â¯h. The study indicates that "soft decomposition" can be performed for as long as 4â¯h, and still give photostable arsenates (III) and methylarsenate species. However, the saturation of the water sample with Ar is required (to reduce the oxygen content) for the longer the decomposition time being applied.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Organic Chemicals
/
Photolysis
/
Arsenic
/
Water Pollutants, Chemical
/
Humic Substances
Language:
En
Journal:
Chemosphere
Year:
2018
Document type:
Article
Affiliation country:
Poland