This can be explained by the 2 : 1 layer structure of smectite, in which the Al octahedron sheet is not exposed to the extractant
during the initial extraction phase.
This is due to high partition coefficient of the zinc between feed and extractant
phases which reduces mass transfer resistance in the organic phase.
In addition, the total dosage of extractant
had a significant influence on the oil yield.
concentrations resulted in more heavy metal extraction.
Fe/Mn oxide-bound metals were then extracted from the residue with 6 hr equilibration of extractants
and sediment samples at 100[degrees]C in a hot water-bath shaker.
40 Table 4: BCR sequential extraction procedure used for heavy metal fractionation Step Metal pools Extractant
Agitation time [B.
Aluminum forms were extracted using extractant
such as 1M potassium chloride (pH 5.
02N HCl as extractant
and measuring the extracted P colorimerically by the molybdenum blue method .
The petroleum industry uses methanol as a mercaptan extractant
in the treatment of crude and Methanol is also finding increasing use as a component of oil well fracturing fluids.
Topics include extracting radioactive elements by calixarenes, the simultaneous removal of radionuclides by extractant
mixtures, the radiolysis of solvents used in nuclear fuel reprocessing, automating extraction chromagraphic and ion-exchange separations for radiochemical analysis and monitoring, and neoteric solvents as the basis for alternative approaches to separating actinides and fission products.
The number of extractable peaks increases, and for each extractant
, unique peaks are observed.
The extraction was carried out in polypropylene bottles by shaking 4 g of ash with the extractant