Arti dan kegunaannya

These test methods measure the amount of carboxyl groups present in wood or lint pulp. The carboxyl group represents the surface charge of the pulp, which is a very important amount used in the paper industry.

ASTM D1926-2011 Metode Uji Standar Kandungan Karboksil Selulosa

Melangkah 1: Cakupan

1.1 These test methods include the determination of the carboxyl content or ion exchange capacity of cellulose from any source. Two test methods, sodium chloride-sodium bicarbonate method (1) and methylene blue method (2), are described. Test methods need to be used within their limitations, and it needs to be recognized that the accuracy of any method for determining carboxyl groups cannot be determined. In the lower carboxyl group value range, the sodium chloride-sodium bicarbonate method is less accurate. The methylene blue method can be used for the whole range of carboxyl group values. It is particularly useful at low ranges. It is not suitable for the determination of carboxyl groups in soluble carbohydrate materials. Although these test methods can be used to determine the ion exchange capacity of unbleached pulp, residual lignin will lead to uncertain errors, especially sulfonic acid groups in unbleached sulfite pulp (3).

1.2 Nilai yang dinyatakan dalam satuan SI dianggap sebagai nilai standar. Tidak ada satuan pengukuran lain yang disertakan dalam standar ini.

1.3 Standar ini tidak dimaksudkan untuk mengatasi semua masalah keselamatan, jika ada, terkait dengan penggunaannya. Pengguna standar ini bertanggung jawab untuk menetapkan praktik keselamatan dan kesehatan yang sesuai dan menentukan penerapan pembatasan peraturan sebelum digunakan..