ISO 21436:2020 PDF
Pulps — Determination of lignin content — Acid hydrolysis method
Pulps — Determination of lignin content — Acid hydrolysis method
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 12
- Дата публикации:
- 8 декабря 2020 г.
- Издание:
- ISO IS 21436 edition 1 version 1
- ICS:
- 85.040
The method is applicable to unbleached, bleached and semi-bleached wood pulp with a lignin content above 1 %. It is not generally intended for fully bleached chemical pulp, because the lignin content in these pulps is too low to be determined accurately.
Abstract
Overview
ISO 21436:2020 - "Pulps - Determination of lignin content - Acid hydrolysis method" specifies a laboratory procedure to measure total lignin in wood pulps using a two‑step sulfuric acid hydrolysis. The method is applicable to with lignin content above 1% and is not generally intended for fully bleached chemical pulps (lignin too low for accurate determination). The standard defines sample preparation, hydrolysis procedures, filtration, gravimetric determination of , and spectrophotometric measurement of (UV absorbance at 205 nm).
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