กระดาษและผลิตภัณฑ์กระดาษ
เอกสารมาตรฐาน
สหรัฐอเมริกา
TAPPI
T 237 cm-22
Carboxyl content of pulp
2022
4
offline
This method describes a procedure for the determination of the content of carboxyl groups in bleached and
delignified pulps. Lignin and lignin degradation products, especially sulfonic acid groups in sulfite pulps (1) interfere
with the determination of carboxyl content, and the method is not applicable to unbleached and semi-bleached pulps.