Determination of sodium nitrate in sodium nitrite by selective ion electrode measurement

Gehring, Douglas G.; Dippel, W.A.; Boucher, Robert S.

doi:10.1021/ac50160a031

Cited by 10 publications

(1 citation statement)

References 5 publications

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“…As an example, results obtained on a sewage sample from a slaughterhouse can be cited. The sample contained 940 ppm NH4+, 12 ppm N02_, and 309 ppm N03~(determined by colorimetry). After carrying out successively the elimination and the reduction procedures, concentrations of 0.35 ppm NH4+, <0.05 ppm N02_, and 300 ppm N03~(measured as ammonia with the electrode) were found.…”

Section: Resultsmentioning

confidence: 99%

Determination of nitrate in water with an ammonia probe

Mertens¹,

Winkel²,

Massart³

1975

Anal. Chem.

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This article describes manual and automatic procedures for the determination of nitrates In water containing ammonia by means of an ammonia probe. The nitrates are determined by measuring the ammonia produced during a heterogeneous reduction by means of Devarda alloy powder. The yield of the nitrate reduction with the Devarda alloy was quantitative. The method shows good accuracy and reproducibility and can be applied in waters ranging from mineral water to sewage. Procedures for the elimination of excess ammonium and nitrite are proposed. Other reduction methods, which did not yield good results, are also discussed.

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Section: Resultsmentioning

confidence: 99%

Determination of nitrate in water with an ammonia probe

Mertens¹,

Winkel²,

Massart³

1975

Anal. Chem.

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The Determination of Nitrate in Mineral Waters by Potentiometry and U.V. Spectrophotometry

Mertens

Hassart

1973

Bulletin des Soc Chimique

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c e u t i s c h I n s t i t u u t , V r i j e U n i v e r s i t e i t Brussel Paardenstraat 67, B-1640 S i n t Genesius Rode Received 29.06.72 -Accepted 29.09.72 SUMMARY Procedures f o r t h e determination of n i t r a t e i n mineral water i n t h e 0,s -5 p.p.m. concentration range with t h e n i t r a t e s e l e c t i v e e l e c t r o d e and U.V. spectrophotometry are compared with a c l a s s i c a l c o l o r i m e t r i c procedure. Because t h e use of a calomel e l e c t r o d e and Hg-Hg2S04 e l e c t r o d e as reference e l e c t r o d e caused short-time f l u c t u a t i o n s , t h e p o t e n t i o m e t r i c determination was c a r r i e d out using a f l u o r i d e s e l e c t i v e e l e c t r o d e as reference e l e c t r o d e a f t e r a d d i t i o n of a f l u o r i d e s p i k e t o t h e s o l u t i o n . The U.V. method proved t o be r a p i d , p r e c i s e and a c c u r a t e . The potentiometric method was a l s o very r a p i d and although it gave acceptable r e s u l t s i n f i v e c a s e s out of s i x it i s i n f e r i o r t o t h e U.V. spectrophotometry i n t h e o t h e r aspects.

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