Th e acid liber ated th e wh ole of th e
tungstic acid from an equal volume of the tungstate, and practically all that was taken down by the pr otein precipitate leaving sufficient excess acid to give a filtrate with a pH between about 3.5 and 4.9 [21].
Zhang, "Catalytic conversion of cellulose to ethylene glycol over a low-cost binary catalyst of Raney Ni and
tungstic acid," ChemSusChem, vol.
De Jesus, "Synthesis and characterization of tungsten trioxide powders prepared from
tungstic acids," Materials Research Bulletin, vol.
Proteins in the blood were precipitated with
tungstic acid.
The standard protocols were followed for estimation of biochemical parameters viz., fasting blood sugar by GOD-POD method, total cholesterol by CHOD-PAP method, triglycerides by GPO-PAP method, HDL cholesterol by Phospho
tungstic acid method, LDL cholesterol, VLDL cholesterol were calculated by Fried-wield's formula and MDA by Thiobarbituric Acid (TBA) Reaction method and these parameters were determined by using spectrophotometer.
Sulfite reductase (SiR) activity was estimated by the coupled SiR/OASTL assay [24, 25] with the addition of NADPH and
tungstic acid [26].
By increasing the pH of the generator eluent, salts of
tungstic acid can be readily removed [15].
The stock solution above (2mL) was placed into a volumetric flask (25 mL capacity) with 10 mL distilled water and 2 mL phosphomolybdic
tungstic acid solution.
The residue (silica and
tungstic acid) was washed with a small volume of hot (1+99) H2SO4, followed by water; the volume was made up to the mark with deionized water.
The patentee produced the purified tungsten by placing
tungstic oxide in a gas furnace, allowing oxygen, carbon, and impurities to escape.