Selective complexometric determination of palladium, with thiourea as masking agent

A method is proposed for selective complexometric determination of palladium, thiourea being used as masking agent. An excess of EDTA is added and the surplus EDTA is back-titrated at pH 5-5.5 with lead nitrate, with Xylenol Orange as indicator. Thiourea is then added to decompose the palladium-EDTA complex and the liberated EDTA is again back-titrated with lead nitrate. The interference of various cations has been studied.     

Determination of Palladium Using Hydroxylamine Hydrochloride as Metal Precipitant

An analytical investigation on the quantitative reduction of palladium (II) to the metal with hydroxylamine hydrochloride in alkaline medium has been carried out. Accurate and reproducible results for the gravimetric determination of 3 to 30 mg of palladium have been recorded. Effects of various foreign metal ions on the determination have been studied.     

Selective complexometric determination of tin, with mercaptans as releasing agents

A method is proposed for selective complexometric determination of tin, mercaptans being used as releasing agents. To a solution containing tin and other cations, excess of EDTA is added and the surplus is back-titrated at pH 5-6 with lead nitrate (Xylenol Orange as indicator). Thioglycollic acid or mercaptopropionic acid is then added to decompose the tin-EDTA complex and the liberated EDTA is titrated with lead nitrate. The interference of various cations has been studied and the method has been employed for the estimation of tin in a variety of alloys.     

Products of Quasi-Involutions in Unitary Groups

Given a regular ^–-hermitian form on an n-dimensional vector space V over a commutative field K of characteristic 2 ( ). Call an element of the unitary group a quasi-involution if is a product of commuting quasi-symmetries (a quasi-symmetry is a unitary transformation with a regular (n–1)-dimensional fixed space). In the special case of an orthogonal group every quasi-involution is an involution. Result: every unitary element is a product of five quasi-involutions. If K is algebraically closed then three quasi-involutions suffice.     

Downstream targets of methyl CpG binding protein 2 and their abnormal expression in the frontal cortex of the human Rett syndrome brain

Background  

The Rett Syndrome (RTT) brain displays regional histopathology and volumetric reduction, with frontal cortex showing such abnormalities, whereas the occipital cortex is relatively less affected.     

Selective complexometric determination of mercury with thiocyanate as masking agent

A method is proposed for selective complexometrie determination of mercury, thiocyanate being used as masking agent. An excess of EDTA is added and the surplus is back-titrated at pH 5-6 with lead nitrate, Xylenol Orange or Methylthymol Blue being used as indicator. Thiocyanate is then added to decompose the mercury-EDTA complex and the liberated EDTA is titrated with lead nitrate. The interference of various cations has been studied.     

Selective complexometric determination of bismuth with mercaptans as masking agents, and its estimation in alloys

A method is proposed for selective complexometric determination of bismuth. To a solution containing bismuth and other cations, excess of EDTA is added and the surplus is back-titrated at pH 5-6 with lead nitrate (Xylenol Orange as indicator). Thioglycollic or mercaptopropionic acid is then added to decompose the bismuth-EDTA complex and the liberated EDTA is titrated with lead nitrate. The interference of various cations has been studied and the method employed to determine bismuth in a variety of alloys.     

Selective complexometric determination of palladium with thiosulphate as masking agent

A selective complexometric method is suggested for the determination of palladium, sodium thiosulphate being used as releasing agent. To a solution containing palladium and other cations, excess of EDTA is added and the surplus is back-titrated with lead nitrate solution at pH 5-5.5 in sodium acetate buffer with Xylenol Orange as indicator. EDTA equivalent to palladium is then released quantitatively with sodium thiosulphate and is titrated with the lead nitrate solution. The interference of various cations has been studied and the method applied for the analysis of alloys.