Spectroscopic analysis sulphur

Table 98) correlated with the Hammett acidity function H0 rather than with log [ROH]/[R+]377. However, subsequent spectroscopic analysis and colligative property measurements showed that anils are present in strong sulphuric acid entirely as the monoprotonated species and since reaction is not instantaneous, it must be occurring on some other species, assumed to be diprotonated. For this to be true a plot of log rate versus the acidity function H+ would have to be linear the values of H+ were not known in this medium but were considered to parallel... 

Shaw S, Lowry GV, Kim CS, Rytuba JJ, Brown GE Jr (2002b) Particle-facilitated mercury transport from New Idria and Sulphur Bank mercury mine tailings. 2. Microscopic and spectroscopic analysis. Environ Sci Technol (submitted)... 

The ionised sulphate group makes carotenoid sulphates strongly polar. This results in significant solubility in water with values up to 0.4 mg/ml. The high polarity and solubility properties determine the choice of isolation procedure. Special methods are employed and detailed isolation procedures available [68]. The isolation methods include column chromatography on Sephadex or silica, TLC and reversed phase HPLC. Sulphur analysis is also desirable. Further characterisation is carried out by spectroscopic methods. 

A classic method is to digest the PHB-containing cell culture with sodium hypochlorite and measure the turbidity of the suspension produced by release of the polymer granules. Alternatively the polymer can be extracted into chloroform solution and its infrared absorbance at 1728 cm determined quantitatively. Another spectroscopic method involves hydrolysing and dehydrating the polymer to crotonic acid with concentrated sulphuric acid and assaying this by conventional quantitative UV analysis. ... 

Althiomycin is a sulphur-containing antibiotic that was first isolated from Streptomyces althioticus in 1957, whose structure has now been shown to be (16) by chemical and spectroscopic methods and by the unequivocal formulation of a derivative, bisanhydroalthiomycin, by A -ray crystallographic analysis. ... 

---