Sulphur inorganic forms

In other reactions, cyanide functions rather simply as a nucleophile. The organic examples are numerous. Reaction at sulphur to form thiocyanate is a convenient inorganic example this occurs with thiosulphate tetrathionate and pentathionate, and with sulphur (Sg and Sg) itself The reactions which... 

The N.F, method uses digestion with sulphuric and nitric acids to obtain the mercury in the inorganic form before titrating with 0-lN thiocyanate as usual in the presence of nitric acid. 

The sites for complex formation in DMSO with inorganic salts depend remarkably on the nature of the metals involved in the salts. The alkali or alkali earth metallic salts form a complex with the oxygen atom in DMSO while Pd(II) or Pt(II) associates strongly at the sulphur atom. The IR frequency of the S—O bond of DMSO shifts to even lower wave numbers when associated with such metal cations as Li+, Na+ or Ca+ +34. On the other hand, in the case of Pd(II) or Pt(II), the S—O frequency appears at higher wave numbers, at around llOO-llAOcm 135. These different shifts for the S—O frequency afford a convenient diagnosis to determine whether the cation associates with the oxygen or the sulphur atom in DMSO. 

Electrolytes are used to promote the exhaustion of direct or reactive dyes on cellulosic fibres they may also be similarly used with vat or sulphur dyes in their leuco forms. In the case of anionic dyes on wool or nylon, however, their role is different as they are used to facilitate levelling rather than exhaustion. In these cases, addition of electrolyte decreases dye uptake due to the competitive absorption of inorganic anions by the fibre and a decrease in ionic attraction between dye and fibre. In most discussions of the effect of electrolyte on dye sorption, attention is given only to the ionic aspects of interaction. In most cases, this does not create a problem and so most adsorption isotherms of water-soluble dyes are interpreted on the basis of Langmuir or Donnan ionic interactions only. There are, however, some observed cases of apparently anomalous behaviour of dyes with respect to electrolytes that cannot be explained by ionic interactions alone. 

Landers et al. [97] and others [98] have described a wet digestion method for the determination of total sulphur in soils. In this method the sample (1.50-500mg) is placed in a digestion flask and heated in a sand bath to dryness at 250°C with 3ml of sodium hypobromite solution. The residue is resuspended with water, neutralized with formic acid, and then hydriodic acid reduction of the sample is followed to quantitatively recover the inorganic sulphate formed by wet oxidation. 

Ferredoxins (Fds) are widespread in the three domains of life and an abundance of sequence data and structural information are available for Fds isolated from several sources. In particular, the bacterial type Fds are small electron-transfer proteins that posses cubane xFe-yS clusters attached to the protein matrix by Fe ligation of Cys via a conserved consensus ligating sequence. The archaeal type ferredoxins are water-soluble electron acceptors for the acyl-coenzyme A forming 2-oxoacid/ferredoxin oxidoreductase, a key enzyme involved in the central archaeal metabolic pathways. Fds have been distinguished according to the number of iron and inorganic sulphur atoms, 2Fe-2S, 4Fe-4S/3Fe-4S (Fig. Ib-d) and Zn-containing Fds. 

While the sulphur values associated with gas, oil and bitumens are either in the form of H2S or organosulphur compounds coals can have significant inorganic sulphur values. This introduces the possibility of desulphurisation by chemical methods different from that required for removal of organic sulphur values. Nonetheless, the desulphurisation problems associated... 

The second part of the Traite consists mainly of tables of nomenclature of the compounds of these simple substances with oxygen, hydrogen, sulphur, and of their salts which are formed with all the known acids, inorganic or organic, together with such observations and comment upon the tables as is needed render them clear to the reader. 

---