| 摘要 |
PROBLEM TO BE SOLVED: To provide a lignin analyzing method which can obtain a lead-acid battery with long service life and less dispersion. SOLUTION: A lignin aqueous solution is regulated to an acid solution of pH of 3.0 by using a nitric acid aqueous solution, a sodium hydroxide solution is dripped as a titrant, and the electric potential difference titration is performed by using a test electrode for pH measurement. Lignin with close basic-acid nature is selected, and used for an expander for the lead-acid battery. |
