A simple and rapid spectrophotometeric procedure has been established for quantization of Ni(II) at trace levels. The reagent isonicotinohydroxamic acid (INHA) reacts with nickel(II) at pH < 10 and form a 1:2 lemon green complex. The complex has a maximum absorption at 610 nm with the molar absorptivity of 1.44x10 L molcm. Beer’s law is obeyed over the range of 0.32-4.80 μgmL. The Sandell’s sen...

The biguanide concentration of polyhexamethylene biguanide hydrochloride (PHMB-HCl) was measured by non-aqueous titration with HClO4, argentometric titration, the Kjeldhal method, and colloidal titration. The summation value of non-aqueous titration and argentometric titration corresponded to two titrable nitrogens in five nitrogens per one unit of PHMB-HCl, and consisted with the result of the...

Quantitative determination of Br?nsted acid sites in acidic mordenite samples with varying proton concentrations has been studied using aqueous conductometric titration method. Conductometric titration of the ammonium form of mordenite with sodium hydroxide is feasible and the results indicate potential number of Br?nsted acid sites. However, Br?nsted acid sites concentration in acidic mordenit...

objective: garlic is a plant has been used as a flavor, and anti-microbial and anti-diarrheal agent. infectious bronchitis virus (ibv) is a coronavirus. the available vaccines against ibv cannot cover new variants. this study evaluated the inhibitory effects of garlic extract on ibv.  materials and methods: the constituents of garlic extract were detected by gas chromatography. this study was d...