the possibility of application of 4-nitrocatechol (4-nc) - tetrazolium salt - organic solventsystems for liquid-liquid extraction-spectrophotometric vanadium (iv and v) speciation wasstudied. six commercially available tetrazolium salts (2,3,5-triphenyltetrazolium chloride (ttc),3-(2-naphtyl)-2,5-diphenyltetrazolium chloride (tetrazolium violet, tv); 3-(4,5-dimethyl-2-thiazol)-2,5-diphenyltetra...

A simple procedure for the quantitative determination of Ceftriaxone pure substance by spectrophotometric method in its kinetic modification using Caro’s acid has been developed and validated. The scheme chemical transformation with reaction potassium caroate proposed. appearance a new wave gives possibility developing Ceftriaxone. obtained results accuracy precision are as follows: RSD = 1.63-...

tidepressants, a group of drugs widely used for treating depressive diseases. Its chemical structure is shown in Fig. 1. Most existing methods for the determination of nortriptyline in bulk, pharmaceutical formulations and biological samples have been reviewed. Among other methods described for the assay of this drug are direct UV-spectrophotometry, derivatives spectrophotometry, fluorimetry an...

a sensitive and selective extraction - spectrophotometric method for the determination of trace amounts of palladium is reported. the method is based on quantitative extraction of brownish tetrabutylammoium tetraiodopalladium (ii) ion pair into a small valume of chloroform at ph 1.3-12.0, followed by spectrophotometric measurements. the beer's law is obeyed over the range 0.02-1.09 mgml-1 at 44...

The metal ions constituents in plants reliable for determination of their medicinal, nutritional and toxicity properties. A novel, simple and accurate spectrophotometric method was developed for the simultaneous determination of Ag+, Cu2+ and Ni2+ ions in different medicinal plants without prior separation steps. This method was based on the different kinetic characteristics between the reactio...