意味と使い方

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 セルロースのカルボキシル含有量の標準試験方法

ステップ 1: 範囲

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 SI単位で表した値を標準値とする。. この規格には他の測定単位は含まれていません.

1.3 この規格は、すべての安全上の懸念に対処することを目的としたものではありません, もしあれば, その使用に関連する. 適切な安全衛生慣行を確立し、使用前に規制上の制限の適用可能性を判断することは、この規格のユーザーの責任です。.