Chemiluminescence vs. Kjeldahl determination of nitrogen in oil shale retort waters and organonitrogen compounds was written by Jones, Bonnie M.;Daughton, Christian G.. And the article was included in Analytical Chemistry in 1985.Reference of 934-48-5 This article mentions the following:
The applicability of combustion/chemiluminescent N determination to determining N in oil shale wastewaters and various representative chem. classes was demonstrated. Only azoxy compounds and those containing the pyrazole nucleus were not amenable to anal. The majority of 56 compounds tested yielded 90-110% of their theor. N content; enhanced recovery was found for N oxide salts. For 12 oil shale wastewaters, combustion/chemiluminescence gave total N values (1100-28,800 mg/L) that did not differ statistically (P > 0.10) from those obtained by the time-consuming wet-chem. Kjeldahl method. The relative standard deviations for 10 replicates of each wastewater were less than 3.5%. No matrix or solvent effects were found. In the experiment, the researchers used many compounds, for example, 3,5-Dimethyl-1H-pyrazole-1-carboxamide (cas: 934-48-5Reference of 934-48-5).
3,5-Dimethyl-1H-pyrazole-1-carboxamide (cas: 934-48-5) belongs to pyrazole derivatives. As is the case with imidazoles, the pyrazole ring offers many opportunities to create new multiring systems that incorporate this heterocycle. Pyrazole rings have been used as core components of several leading non-steroidal anti-inflammatory drugs (NSAIDs) and antihypertensive drugs. It has also been found to be useful as a bifunctional ligand for metal catalysis.Reference of 934-48-5
Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics