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The rice husk was mixed with phosphoric acid (50 wt%) in a mass ratio (rice husk to phosphoric acid) of 1 4, then the mixture was slightly agitated to ensure the penetration of the acid throughout, then the mixture was heated to 80°C for 1 h and left overnight at room temperature to help the appropriate wetting and impregnation of the precursor.
Serum was collected by using phthalate-free tubing and a heated pipette, mixed with phosphoric acid, and stored in a freezer.
Aliquots of the upper layer of the centrifuged urine sample were mixed with phosphoric acid and TBA reagent in an iced methanol glass tube and then boiled for 60 min. The mixture was then cooled in iced water for 5 min and centrifuged after the addition of methanol.
It was found in this work that silicotungstic acid hydrate could be mixed with phosphoric acid (H3PO4, 85%) to make a viscous paste material with high conductivity (10−2 S/cm at room temperature).
Zinc nitrate solution (0.1 mol L−1) was mixed with phosphoric acid, sodium di-hydrogen phosphate, or di-sodium hydrogen phosphate solution (0.1 mol L−1) in a molar ratio of Zn/P = 3/2 at room temperature for more than 1 h.
Similar(55)
In two parallel experiments, aliquots of 0.6 M DNPPA + 0.3 M TEP/kerosene were mixed with 9.2 M Egyptian phosphoric acid at room temperature at 70 °C, respectively for 15 days.
In brief, 160 μL of each homogenate was mixed with 960 μL of phosphoric acid (1%, v/v) followed by addition of 320 μL thiobarbituric acid solution (0.67%, w/w).
This was made by mixing the lead dioxide with phosphoric acid.
Briefly, 500 μl of tissue extract was mixed with 90 μl of concentrated phosphoric acid and then extracted with 3 ml of tert-butylmethyl ether (MTBE).
After separation, the organic phase was mixed with 75 μL of 100 mM phosphoric acid, and the aqueous phase was then separated and mixed with 20 μL methanol.
Briefly, 0.17 g of Whatman CF11 were slowly mixed with 10 mL of cold (4°C) phosphoric acid (85%), and left in contact for 5 minutes.
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