Simultaneous determination of total nitrogen and total oxygen demand in aqueous samples

Chemiluminescence vs. Kjeldahl determination of nitrogen in oil shale retort waters and organonitrogen compounds

“…Snodgrass (12) reports that for fertilizer processing wastewater, the sum of total Kjeldahl nitrogen (TKN) and N03 N equals the total nitrogen (TN) yielded by combustion/chemiluminescent analysis (C/CL). Similarly, Clifford and McGaughey (10) report excellent agreement between C/CL and wet-chemical methods (i.e., sum of TKN, N03 N, and N02 N) for a domestic/industrial wastewater sample. For aqueous biological and clinical samples (rat urine and human urine and feces), Ward et al (13) find no significant difference between C/CL and a Kjeldahl method that uses a mixed CuS04/Se02 catalyst.…”

“…The response from inorganic nitrate and nitrite salts in this study was enhanced; apparent responses of 114% and 122% of actual nitrogen contents, respectively, were obtained. This is attributed to relatively higher efficiencies of conversion to NO because of the higher oxidation state of nitrogen oxide salts (10). This may be a serious drawback for the application of C/CL methods to agricultural wastewaters or biological samples.…”

A high-throughput assay to quantify protein hydrolysis in aerobic and anaerobic wastewater treatment processes

“…defined as 150 gTOD/d. TOD takes into account oxygen demand for carbon and nitrogen removal (CTOD=CBOD5 + 4.18CNH4-N, Clifford & McGaughey, 1982). This facility treats wastewater of domestic origin with a minor fraction of industrial discharge (<10%).…”