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ASTM E1721-01

Historical Revision

Standard Test Method for Determination of Acid-Insoluble Residue in Biomass

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1.1 This test method covers determination of the acid-insoluble residue of hard and soft woods, herbaceous materials (such as switchgrass and sericea), agricultural residues (such as corn stover, wheat straw, and bagasse), wastepaper (such as office waste, boxboard, and newsprint), acid and alkaline pretreated biomass, and the solid fraction of fermentation residues. All results are reported relative to the 105C oven-dried weight of the sample.

1.2 The residue collected contains the acid-insoluble lignin and any condensed proteins from the original sample. An independent nitrogen analysis would be required to determine the acid-insoluble lignin content separate from the condensed protein fraction and is outside the scope of this test method.

1.3 A portion of the lignin in some biomass samples will remain soluble during this procedure. The total lignin in a biomass sample includes both acid-soluble lignin and lignin in the acid insoluble residue.

1.4 The values stated in SI units are to be regarded as the standard.

1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific hazards statements are given in Section 8 and Note 2 and Note 4.


The acid-insoluble residue content is used in conjunction with other assays to determine the total composition of biomass samples.

SDO ASTM: ASTM International
Document Number E1721
Publication Date Nov. 10, 2001
Language en - English
Page Count 3
Revision Level 01
Supercedes
Committee E48.05
Publish Date Document Id Type View
May 1, 2024 E1721-24 Revision
Nov. 10, 2001 E1721-95 Revision
Nov. 10, 2001 E1721-01 Revision
July 1, 2020 E1721-01R20 Reaffirmation
June 1, 2015 E1721-01R15 Reaffirmation
Nov. 1, 2009 E1721-01R09 Reaffirmation