Organic sulfur data

The chemistry of both organic sulfur compounds and azaaromatic compounds has been widely investigated mainly for industrial purposes for many years, and vast amounts of data have been accumulated. However, many studies lack mechanistic support. 

The mechanism of mutagenesis by sulfur mustard (and other mustards) involves the alkylation of DNA. As a bifunctional alkylating agent, sulfur mustard causes cross-linkage of DNA strands, as well as monofunctional alkylation products.19 Sulfur mustard and nitrogen mustard have been used In mutation studies In a variety of organisms, but data on the relative frequencies of induction of different alky-... 

W.D. Good, "Correlation of Heat of Formation Data for Organic Sulfur Compounds , JPhysChem 65, 1430-32 (1961) 45) Fedo-... 

The principal use of forms of sulfur data is in connection with the cleaning of coal. Within certain limits, pyrite sulfur can be removed from coal by gravity separation methods, whereas organic sulfur cannot. Pyrite sulfur content can therefore be used to predict how much sulfur can be removed from the coal and to evaluate cleaning processes. If the pyrite sulfur occurs in layers, it can usually be removed efficiently. If it occurs as fine crystals dispersed throughout the coal, its removal is very difficult. 

Yurovskii (48) recognized the importance of elemental sulfur in the formation of pyritic and organic sulfur compounds and suggested that the elemental sulfur found in coal today is a primary substance formed during coal formation. However, this view is unsupported by recent data (47). 

Figure 3. Relationship between 834S value and organic sulfur content in Illinois Basin coals. Data are from the literature (112-115).

Figure 4. Comparison of isotopic composition of pyritic and organic sulfur in low- and high-sulfur coals in the Illinois Basin. Data are taken form Westgate and Anderson (113). Samples were collected from the top, middle, and base of the Herrin Coal at each mine.

Figure 11. Schematic showing the quantitative evolution of sulfur in lacustrine organic matter. Data from 1,16.-12.

The Microbial Mat. The "intermediate fraction of the extracts and pyrolysates of the kerogens of a modem and buried mat were analysed by GC with coupled FID and FPD and GC-MS. In the extract of the modem mat, two isomers of a C20 thiophenic isoprenoid (compounds I and II) already reported in the literature (11-12) are the most abundant organic sulfur compounds (Figure 5B). The "intermediate" fraction of the pyrolysate of the corresponding sample, is also dominated by the same two isomers of thiophenic isoprenoids that exhibit a similar internal ratio as in the extract. The presence of a third isomer was detected in smaller quantity (compound III)(13). Other thiophenic compounds are present in the sample and were tentatively identified using mass spectra data, GC retention time, and literature (14-16). They are similar to the compounds found in the "intermediate" fraction of the pyrolysate of the buried mat (Figure 5D). 

Examination of the data on forms of sulfur appears to substantiate processes implied by the data on total sulfur. With some exceptions, organic sulfur is more important, or of approximately equal importance in organic-rich samples, whereas... 

Sulfur NMR spectra have been obtained that represent the organic sulfur derived from the extraction residue of coal. This NMR data agrees very well with the GC-MS data. 

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