Method of measuring concentration of nonelectrolyte in electrolyte solution, method of preparing mixed solution containing electrolytes and nonelectrolytes and apparatus for preparing the solution

An apparatus for preparing a mixed solution containing at least one electrolyte and at least one nonelectrolyte, comprising:

• electrolyte storage means for storing the electrolyte;
• nonelectrolyte storage means for storing the nonelectrolyte;
• water supply means for supplying a predetermined amount of water;
• a preparation tank for holding and stirring to uniformly mix a set amount of the electrolyte supplied from said electrolyte storage means, a set amount of the nonelectrolyte supplied from said nonelectrolyte storage means and a set amount of the water supplied from said water supply means;
• and
• an electric conductivity meter for measuring the concentration of a water solution stirred and uniformly mixed in said preparation tank;
• wherein after an electrolyte water solution of a given concentration is prepared by supplying the electrolyte and the water into said preparation tank, a given amount of the nonelectrolyte is supplied incrementally from said nonelectrolyte storage means into said preparation tank to thereby prepare a mixed water solution, the concentration of the nonelectrolyte in the mixed water solution is continuously measured by said electric conductivity meter, and the supply of the nonelectrolyte from said nonelectrolyte storage means into said preparation tank is stopped when the value of the concentration reaches a given value.

An apparatus for preparing a mixed solution containing at least one electrolyte and at least one nonelectrolyte, comprising:

• electrolyte storage means for storing the electrolyte;
• nonelectrolyte storage means for storing the nonelectrolyte;
• water supply means for supplying a given amount of water;
• a first preparation tank for holding and stirring to uniformly mix a given amount of the electrolyte supplied from said electrolyte storage means and a given amount of the water supplied from said water supply means;
• a first electric conductivity meter for measuring the concentration of an electrolyte water solution stirred and uniformly mixed in said first preparation tank;
• a second preparation tank for holding and stirring to uniformly mix the electrolyte water solution of a given concentration supplied from said first preparation tank and a given amount of the nonelectrolyte supplied form said nonelectrolyte storage means;
• and
• a second conductivity meter for measuring the concentration of the nonelectrolyte in a mixed water solution stirred and uniformly mixed in said second preparation tank;
• wherein a mixed water solution is prepared by incrementally supplying a given amount of the nonelectrolyte from said nonelectrolyte storage means into said second preparation tank, the concentration of the nonelectrolyte in the mixed water solution is continuously measured by said second electric conductivity meter, and the supply of the nonelectrolyte from said nonelectrolyte storage means into said second preparation tank is stopped when the value of the concentration reaches a given value.