Nov 21, 1990 - Commercially available automatic titration systems were tested in 1988 for potentiometric titration of liberated iodine by the Winkler method of ...
Marine Biology108, 341-348 (1991)~
Marine Biology @ Springer-Verlag 1991
Automatic potentiometric determination of dissolved oxygen W. Gran~li a and E. Gran~li 2
1 Universityof Lund, Dept. of Ecology, Limnology,P.O. Box 65, S-221 00 Lund, Sweden z Universityof Lurid, Dept. of Ecology, Marine Ecology, P.O. Box 124, S-221 00 Lund, Sweden Date of final manuscript acceptance: November 21, 1990. Communicatedby O. Kinne, Oldendorf/Luhe
Abstract. Commercially available automatic titration
systems were tested in 1988 for potentiometric titration of liberated iodine by the Winkler method of oxygen determination. The potentiometric equivalence point was also compared to the manual starch end point. Finally the automatic method was used in order to estimate belowhalocline respiration in the Kattegat, Sweden. Standard deviations of 0.007 ml Oz 1-1 or 0.1 to 0.3% coefficients of variation (% standard deviation of the mean) were achieved when titrating 25 ml from replicate 60-ml oxygen bottles using the automatic method, or 50 ml manually. The precision for replicate titrations of 50-ml aliquots of 0.001 N K I O 3 was
