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DETERMINATION OF LOW CONCENTRATIONS OF INORGANIC CARBON IN LAKE WATER
Author(s) -
JOHNSON MURRAY G.,
MICHALSKI MICHAEL F. P.
Publication year - 1970
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.1970.15.3.0481
Subject(s) - total inorganic carbon , carbon fibers , bicarbonate , titration , chemistry , dissolved organic carbon , environmental chemistry , total organic carbon , mineralogy , inorganic chemistry , carbon dioxide , materials science , organic chemistry , composite number , composite material
A method is described for isolation and concentration of inorganic carbon (bicarbonate and free CO 2 ) for the accurate and precise (to 0.1 mg C liter −1 ) analysis required in the determination of primary productivity by the 14 C method in extremely soft waters. Lake water was acidified to pH 3.0 and inorganic carbon was absorbed quantitatively in base (about 0.02 n NaOH) in a rubber balloon suspended within the sample bottle. Inorganic carbon in the absorbant was analyzed by back‐titration with acid and with a carbon analyzer; results of the two methods differed by only 6.5%. Improved precision may be achieved by increasing the ratio of lake water to absorbant.