|An automated precise Winkler titration for determining dissolved oxygen on board ship|
|Furuya, K.; Harada, K. (1995). An automated precise Winkler titration for determining dissolved oxygen on board ship. J. Oceanogr. 51(3): 375-383|
|In: Journal of Oceanography. Springer: Tokyo. ISSN 0916-8370, more|
An automated titration for the Winkler method is presented for measuring primary productivity in the ocean. The system is based on a microcomputer-controlled titration with potentiometric endpoint detection. By the use of 0.005-N sodium thiosulfate as a titrant and a program designed to shorten the time for measuring, the method achieves a precision of 0.04% coefficient of variation with a range of 0.01 to 0.10% for six replicates of samples at oxygen concentration of 70 to 250 µM. It takes about four to five minutes to measure one sample.