Studies on the Second Derivertive Automatic Titration. I.:Automatic Titrator, Type AT-I, and Determir ation of a Main Factor Affecting Titation Errors

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We designed a new automatic stop titration, using the second derivertive of the ordinary potentiometric titration curve, made by electrical second derivertive circuit, as a magnetic-cock-operatingsignal.<BR>Namely, the second derivertive voltage stands zero before the end point, and then it increases (or decreases) as the titration approaches to the end point, and at the end point it suddenly decreases (or increases) beyond the zero line, returning to zero line smoothly after the end point.<BR>So, if we use the second derivertive voltage as triggering signal, we can accomplish automatic stop titration, very easily.<BR>In this report, we descrive the second derivertive automatic titrator and the stochastic experiment of determinating the main factor affecting the titration errors. The main factor has been proved to be titration speed, and the other factors, time constant of derivertive circuit, position of electrode and presence of input filter, have only less effect to titration errors.<BR>The original paper of this report was presented before the meeting of the society of the Japan Society for Analytical Chemistry, Tokyo, October 24, 1953.
社団法人日本分析化学会の論文