In dry ashing procedures, the organic matter of a sample is decomposed at high temperatures and resulting ash is subsequently dissolved in a strong acid .
They include dry ashing, wet digestion, and microwave techniques frequently used in environmental analytical chemistry.
Seven used microwave mineralization in a closed system (Ia-Ig), and five applied wet digestion in open arrangement (II-VI), while three were based on dry ashing (VII-IX).
The best results with recoveries in the range 100 [+ or -] 5-103 [+ or -] 3% were obtained for the laborious and exceptionally used dry ashing methodology (VII).
Therefore, aim of this study was to compare three main digestion methods; microwave-assisted wet digestion, wet-acid digestion on hot plate and dry ashing mineralization in muffle furnace for the maximum recovery of Pb from 28 poultry feed samples of 7 commercial brands from Pakistan.
Prior to analysis, digestion was made using three main digestion procedures; dry ashing mineralization in muffle furnace, microwave-assisted wet digestion and wet- acid digestion on hot plate.
For dry ashing mineralization, 4 g of each sample were taken in porcelain crucible, placed in muffle furnace at 500 degC for 5 h.
The principal sample preparation methods used for V determination in petroleum and petroleum products by spectroanalytical techniques, besides direct analysis, are dilution with organic solvents, dilution in three-component systems (emulsion or micro-emulsion), dry ashing and wet acid digestion.
Dry ashing is used for the almost complete elimination of organic materials prior to analyte determination.
The sample preparation method used in this study for determination of V in asphaltite by spectroanalytical technique includes dry ashing and wet acid microwave digestion.
The sample preparation method was developed for V determination in asphaltite by spectroanalytical techniques, dry ashing (at 850[degrees]C) and wet acid digestion (HCl+HN[O.sub.3]+[H.sub.3]B[O.sub.3]).
Traditional dry ashing
test methods require hours in a muffle furnace to oxidize sample material.