FIELD: chemistry.
SUBSTANCE: method of the determination of lignin in cellulose semi-products by chemical processing with the following separation of lignin and determination of its quantity consists in the fact that chemical processing of a cellulose semi-product is carried out with 1 ml of a reagent, which is prepared by mixing concentrated nitric acid and dioxane in a ratio of 1:1 by volume, at heating on a boiling water bath for 5 minutes, with the determination of lignin being realised by means of spectrophotometry at 340 nm after preliminary alkalisation and separation of the cellulose residue that does not dissolve.
EFFECT: simplification and acceleration of the analysis performance.
1 cl, 14 ex, 1 tbl
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF DETERMINING LIGNIN | 2013 |
|
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| METHOD FOR PRODUCING MICROCRYSTALLINE CELLULOSE | 2018 |
|
RU2684082C1 |
| METHOD OF MODIFYING LIGNIN | 2013 |
|
RU2524343C1 |
| REAGENT FOR HOMOGENEOUS NITRATION OF SULPHATE LIGNIN | 2015 |
|
RU2608145C1 |
