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Determination of submicromolar concentrations of ammonia in natural waters by a standard addition method using a gas‐sensing electrode 1
Author(s) -
Garside Christopher,
Hull Gretchen,
Murray Susan
Publication year - 1978
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1978.23.5.1073
Subject(s) - ammonia , calibration , detection limit , ammonia gas , standard solution , electrode , standard addition , chemistry , environmental science , environmental chemistry , analytical chemistry (journal) , chromatography , physics , organic chemistry , quantum mechanics
A standard addition technique using a gas‐sensing electrode with a modified electrode filling solution provides a rapid and convenient method suitable for both field and laboratory measurement of ammonia. The method has a detection limit of 0.2 µ M of NH 3 , a precision of ±0.1 µ M of NH 3 , and no measurable salt error. Calibration is stable for a period of days and analytical rates of 15 samples per hour are possible.