Long-term degradation effect on the molecular composition of black carbon in Brazilian Cerrado soils was written by Justi, Marina;Schellekens, Judith;de Camargo, Plinio Barbosa;Vidal-Torrado, Pablo. And the article was included in Organic Geochemistry in 2017.SDS of cas: 19064-65-4 This article mentions the following:
The effect of long term degradation on soil black carbon (BC) is important for correctly interpreting the role of BC in the global carbon cycle and in biochar studies. To address this, we studied three soil profiles (0-2 m depth, > 9000 yr) in undisturbed Brazilian Cerrado vegetation naturally affected by wildfires. The mol. composition of several soil organic matter (OM) pools was studied using anal. pyrolysis. Other analyses included general chem. and phys. characteristics and micromorphol. The soil OM fractions included the free light fraction (FLF; particulate OM), the occluded light fraction (OLF; particulate OM within aggregates), the 0.1 M NaOH extractable OM (EXT; comparable with the combined humic acid and fulvic acid fractions) and the remaining residue (RES; treated with HF/HCl; comparable with the humin fraction). Although each fraction represents a continuum of material, they were assigned a different degradation level. The light fractions represent relatively intact BC (i.e. charcoal) of which the OLF is more degraded than the FLF, the EXT contains more decomposed material and the RES represents residual OM that is difficult to decompose The largest contribution to the total soil OM was from RES and EXT, together accounting for > 80% of the total soil C. The relative contribution from BC-associated pyrolysis products was generally large for all fractions (between 5% and 57%) and showed an increase with depth in the OLF and RES. Based on factor anal. exclusively applied to BC-associated pyrolysis products from all four OM fractions, two BC degradation indexes were extracted: Index 1, reflecting depolymerization and relative enrichment of N, and Index 2, reflecting a relative increase in condensed structures. Both indexes gradually increased with depth for all fractions, except FLF. Based on these indexes, we selected some simple ratios that showed good correlation with them (r2 > 0.7). For Index 1, reflecting depolymerization, adequate ratios for all fractions included benzene/indene and benzene/C1 naphthalenes. For Index 2, reflecting the relative accumulation of condensed BC, adequate ratios for all fractions included biphenyl/C2-benzene, fluorene/C2-benzene and 4-ring PAHs/C2-benzene. In the experiment, the researchers used many compounds, for example, 3-Methoxypyridazine (cas: 19064-65-4SDS of cas: 19064-65-4).
3-Methoxypyridazine (cas: 19064-65-4) belongs to pyridazine derivatives. Pyridazine-based compounds continued to be a great source of biologically active compounds as evidenced by the number of publications which emerged in 2021. Pyridazine compounds have attracted interest in various fields like medicinal, industrial, and agricultural research as they are used for numerous biological activities and other applications.SDS of cas: 19064-65-4
Referemce:
Pyridazine – Wikipedia,
Pyridazine | C4H4N2 – PubChem