The solubility of cupric and cuprous oxides was measured in water over the range 25 to 350 °C in the presence of various chemical agents (NaOH, NH3, B(OH)3, H3PO4, (OHCH2)3CNH2, (OHCH2)3CN(OHCH2CH3)2, HF3CSO3, HNO3 and mixtures thereof), and in steam to 400 °C as a function of pressure. Large discrepancies exist between the various experimental studies, especially at high temperatures for cupro...

The methyl, ethyl, propyl and butyl esters of the fatty acids of Thevetia peruviana seed oil were successfully prepared by the batch-esterification procedures. Various acid catalyst and various molar ratios of fatty acid to alcohol were investigated. H3PO4 was found to be ineffective to catalyze the esterification of the free fatty acid. HCl gas and conc. H2SO4 both proved very effective in cat...

Single-bubble sonoluminescence (SBSL) spectra in H2O show featureless continuum emission. From an acoustically driven, moving bubble in phosphoric acid (H3PO4), we observe very strong molecular emission from excited OH radicals (∼310  nm), which can be used as a spectroscopic thermometer by fitting the experimental SBSL spectra to the OH A 2Σ+ - X 2Π rovibronic transitions. The observed emissio...

Pine as a softwood and poplar hardwood pretreated with hydrochloric acid (HCl), phosphoric (H3PO4), hypophosphorous (H3PO2) are studied for the pyrolytic properties products in thermogravimetry (TG) fixed bed reactor. The pyrolysis performances pronouncedly distinguished due to compositional structural changes induced by pretreatments. Reduction mineral content biomass feedstocks pretreatment a...

Oil palm shell was used as a precursor for preparation of activated carbon using different chemical activations (potassium hydroxide (KOH), zinc chloride (ZNCl2), and phosphoric acid (H3PO4)). Each carbons (AC) mixed with nano-zinc oxide to form composite. From the gas sorption analyzer, it is showed that nitrogen adsorption isotherms show Type II ZnO/AC-KOH ZnO/AC-ZnCl2 corresponding micro- me...

With this method, picomole amounts of phenylalanine and tyrosine can be rapidly separated and directly measured by absorbance at 206 nm. As little as 25 microliters of serum or plasma suffices. Plasma is deproteinized and 20 microliters of the supernate, representing 1.8 microliters of plasma, is applied to a reversed-phase column and eluted isocratically with a solution containing methanol and...