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Titolo:
Simultaneous determination of TOC and TNb in surface and wastewater by optimised high temperature catalytic combustion
Autore:
Ammann, AA; Ruttimann, TB; Burgi, F;
Indirizzi:
Swiss Fed Inst Environm Sci & Technol, EAWAG, CH-8600 Dubendorf, Switzerland Swiss Fed Inst Environm Sci & Technol Dubendorf Switzerland CH-8600 land
Titolo Testata:
WATER RESEARCH
fascicolo: 14, volume: 34, anno: 2000,
pagine: 3573 - 3579
SICI:
0043-1354(200010)34:14<3573:SDOTAT>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
TOTAL DISSOLVED NITROGEN; OXIDATION TECHNIQUE; SEAWATER; DOC; WATERS;
Keywords:
total bound nitrogen (TNb); high temperature catalytic combustion; chemiluminescence detection; simultaneous determination of TOC and TNb; method comparison; surface and wastewater;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
21
Recensione:
Indirizzi per estratti:
Indirizzo: Ammann, AA Swiss Fed Inst Environm Sci & Technol, EAWAG, Uberlandstr 133, CH-8600 Dubendorf, Switzerland Swiss Fed Inst Environm Sci & Technol Uberlandstr 133 Dubendorf Switzerland CH-8600
Citazione:
A.A. Ammann et al., "Simultaneous determination of TOC and TNb in surface and wastewater by optimised high temperature catalytic combustion", WATER RES, 34(14), 2000, pp. 3573-3579

Abstract

Total nutrition parameters as e.g. total organic carbon (TOC) and total bound nitrogen (TNb) are indispensable to water quality and elemental nutrient balances. The recommended and most often applied wet chemical digestion for TNb measurement, however, is discouragingly labour intensive. Therefore,high temperature (690 degrees) catalytic (Pt/Al2O3) combustion (HTC) was investigated for simultaneous determination of TOC and TNb. Using commercially available instruments a fast and simple procedure was established by coupling a TOC-analyzer to a chemiluminescence detector (CLD) for determination of NOx gases in the combustion exhaust. Dissolved compounds as well as particulate matter were used to test carrier gases, hot zone fillings and injection Volumes influencing N-recovery rates. Injecting dissolved wastewatercomponents (e.g. ammonium, urea, antipyrine) direct onto the catalyst yielded low N-recovery rates (40-90%) depending on concentration. Instead of increasing the oven temperature the evaporation of injected sample solution was improved which resulted in quantitative recovery rates for all investigated compounds except hydrazine. A representative number of TNb Values from river and domestic wastewater obtained by HTC-CLD were compared to wet chemical digestion. No significant differences between the two methods were found. (C) 2000 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 11/07/20 alle ore 17:45:04