QUANTITATIVE METHOD OF TRACE CALCIUM CONCENTRATION IN AQUEOUS SOLUTION

摘要

PROBLEM TO BE SOLVED: To provide a quantitative method that can easily and rapidly measure the concentration of a trace calcium component included in an aqueous solution at the occurrence site without requiring a large-sized and expensive dedicated device, does not deteriorate the peripheral environment, and has a high safety.;SOLUTION: A measurement method of measuring trace calcium in an aqueous solution for chloride alkaline electrolysis includes: a process (A) of performing absorptiometry by bringing a calcium concentration measurement liquid containing an indicator for chelate titration into contact with an aqueous solution to be measured; and a process (B) of performing absorptiometry using, as a blank aqueous solution, the indicator for chelate titration including an acetic acid type chelating agent in a salt water used for chloride alkaline electrolysis, and calculating the calcium concentration included in the aqueous solution to be measured.;SELECTED DRAWING: None;COPYRIGHT: (C)2016,JPO&INPIT