ERROR SOURCES IN SIMULTANEOUS NITRATE NITRITE DETERMINATIONS USING COPPERISED CADMIUM AS NITRATE-REDUCING AGENT

Authors
NOVIC M TEZAK S PIHLAR B HUDNIK V
Citation
M. Novic et al., ERROR SOURCES IN SIMULTANEOUS NITRATE NITRITE DETERMINATIONS USING COPPERISED CADMIUM AS NITRATE-REDUCING AGENT, Fresenius' journal of analytical chemistry, 350(10-11), 1994, pp. 653-655
Citations number
8
Categorie Soggetti
Chemistry Analytical
Journal title
Fresenius' journal of analytical chemistry → ACNP
ISSN journal
09370633
Volume
350
Issue
10-11
Year of publication
1994
Pages
653 - 655
Database
ISI
SICI code
0937-0633(1994)350:10-11<653:ESISNN>2.0.ZU;2-1
Abstract
The accuracy of the nitrate determination by the standard method, base d on the reduction of nitrate to nitrite on copperised cadmium, has be en found to be highly dependent on an overreduction of nitrite, if pre sent in the sample. Using FIA, based on a two sample-loops injector an d one detector, the influence of the pH value of the carrier and the c ontact time of the sample plug with the reducing agent on the further reduction of nitrite, have been studied in detail and optimised to a c ontact time of 20 s and a pH value of 9.5.