Digestion of Fly Ash for the Determination of Mercury, Arsenic and other Elements by ICP-OES and ICP-MS

Recovery of mercury from fly ash is as complete after leaching with Multiwave GO / Multiwave GO Plus using SmartVent technology as it is in closed vessels without venting capabilities. This report compares data for samples of fly ash, bottom ash and a reference material "Fly Ash" BCR - 176R.

Mercury and arsenic are difficult elements to be rou-tinely determined in fly ashes because of the possible losses as volatile elements. Evaluation of sample preparation methods, however, is hindered by the lack of reference materials certified for mercury.
For a vessel system using the SmartVent technology it is important to prove that a potentially volatile ele-ment as mercury can be completely recovered.
So the recoveries from acid leaching by Multiwave GO / Multiwave GO Plus with a rotor 12HVT50 are compared with a Multiwave 3000 system equipped with a rotor 8SXF1001. This is a completely sealed system that has, during its long time availability, prov-en to recover mercury and arsenic completely.
Reliable leaching for mercury, arsenic and other envi-ronmentally relevant elements can be achieved with pressure activated venting vessels of rotor 12HVT50 with Multiwave GO / Multiwave GO Plus in the same quality as with a hermetically sealed high pressure vessel.

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