The aim of this work is to develop methods for arsenic extraction in mining residues employing ultrasound assistance extraction and analyte determination by hydride generation ICP OES.
Unfortunately, due to the high cost and the lack of validated analytical methods for arsenic speciation, most arsenic exposure assessments have relied upon measurements of total arsenic from food items that do not differentiate between organic and inorganic arsenic.
The use of such methods for arsenic may be limited at present.
Methods for arsenic removal from water include oxidation, precipitation, coagulation, adsorption, nanofiltration, reverse osmosis, and even bioremediation [ 143].
There were individual papers on a) arsenic exposure routes and arsenic health effects; b) principles governing the effectiveness of water treatment methods for arsenic removal; c) disposal of arsenic-bearing residuals (spent sorptive media) from water treatment; and d) the link between arsenic exposure and coronary heart disease.
Further, XAFS spectroscopy, being a direct method for determining arsenic speciation coals, can also be used to assess the critical assumptions and inferences present in less direct methods of arsenic speciation based on sequential leaching and other fractionation methods.
The analytical results obtained by the present method for total arsenic in reference materials, orchard leaves (SRM 1571) and water samples GBW(E) 080390, agree well with the certified values.
We used standard reference material (SRM) 1568a, rice flour (National Institute of Standards and Technology, Gaithersburg, MD, USA) to validate the method for total arsenic measurements.
The coagulation along with filtration method for removing arsenic from contaminated sources is quite economic but often displayed lower efficiencies (<90%) [ 1].
