Copolymer 6 has been observed to be a good extractant
for all the metal picrate salts used.
13, in the pH range in which Dy is discharged, 100% of the trace elements are present on the acid side instead of the extractant
side and therefore, the Dy recovery solution does not contain any trace elements.
Due to the low rate of diffusion, the process is carried out for a long time; therefore, the loss of the extractant
is possible as a result of evaporation.
Regression models correlating the amount of solubilized potassium (dependent variable) versus contact time for each extractant
at both temperatures were generated at SISVAR (Ferreira, 2011).
ex,t2]--oil and extractant
volumes at respective extraction temperatures t1 and t2.
Five grams of each soil sample were extracted with a 25 mL aliquot of the Mehlich-3 extractant
In earlier studies the extractant
properties of some crown ether macrocycles carrying oxygen nitrogen and sulfur donors has been investigated and the results disclosed selective crown ethers for some transition metal cations such as Ag+ and Hg2+.
This is due to high partition coefficient of the zinc between feed and extractant
phases which reduces mass transfer resistance in the organic phase.
5 64 9 27 (1) pH in water; (2) Colorimetry; (3) Mehlich-1 extractant
; (4) KCl extractant
(1 [mol L.
The amount of ascorbic acid was determined by the AOAC (1984) method modified by Benassi and Antunes (1988), using oxalic acid as extractant
It is well known that the ultrasonic frequency, ultrasonic power, extraction temperature, extraction time, extractant
type and dosage have a significant effect on oil yield during the ultrasonic extraction of oil shale by organic solvent .
Nevertheless, such results can be controversial because the removal process is also strongly influenced by many other factors, such as the matrix composition, the chemical properties of the extractant
, the concentration and pH of the extracting solution and the temperature.