ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
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The rapid determination of lignin

G. Rendko

 

Abstract: To 0.4 g. of finely ground wood contg. 0.8 g. of unbleached cellulose in a 250-ml. flask with ground stopper add 72 ml. of concd. HCl and shake. After 15 min. add dropwise 3 ml. concd. H2SO4 and shake. Again after 15 min. add 20 ml. 0.14 N KBrO3 + KBr (4.176 g. KBrO3 + 30 g. KBr in 1 l.) and wet the stopper. After 30 min. add 2 g. KI in 25 ml. H2O and after 5 min. titrate with 0.1 N Na2S2O3 the excess iodine with starch as indicator (the amt. used is a). Dry matter, benzene-alc. ext., and ash are detd. The amt. used for the blank test is b. % lignin = {{[93.55(b - a)f] - 70.23en}/{n[100 - (h + e + p)]}} - 0.96, in which a = ml. of 0.1 N Na2S2O3 with factor f, b = ml. of 0.1 N Na2S2O3 with factor % lignin {{[93.55(b-a)f] -70.23en}/[n[100-(h +e + p)]}} -0.96 f for blank, f = factor 0.1 N Na2S2O3, n = wt. of the sample in g., e = % ext., h = % H2O, and p = % ash.

Full paper in Portable Document Format: 55-6a308.pdf (in Slovak)

 

Chemical Papers 5 (5-6) 308–322 (1951)

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