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Lignin, hydrogen peroxide determination

Methods. A typical hydrogen peroxide bleaching operation consists of treatment of a 20% HPL solution in 60-75% aqueous ethanol with 25-50% hydrogen peroxide (by weight) on lignin derivative at 80°C. The reaction medium is adjusted to pH 2 by the addition of HC1, or to pH >12-13 by NaOH. Color loss is determined by UV/VIS absorbance measurements on suitably diluted samples. [Pg.439]

Regarding exploitation of the isosbestic point in DWS for the analysis of turbid samples, a good example is the determination of hydrogen peroxide in wood pulp bleaching streams relying on peroxide association with the molybdate ion [22]. The influence of dispersed lignin in the pulp bleaching stream, a critical spectral interferent in the analytical procedure, was quantitatively circumvented. [Pg.106]

See other pages where Lignin, hydrogen peroxide determination is mentioned: [Pg.1471]    [Pg.1471]    [Pg.93]    [Pg.168]    [Pg.447]    [Pg.167]    [Pg.438]    [Pg.234]    [Pg.74]    [Pg.256]    [Pg.257]    [Pg.482]    [Pg.1289]    [Pg.487]    [Pg.282]    [Pg.114]    [Pg.445]    [Pg.75]   
See also in sourсe #XX -- [ Pg.627 , Pg.628 ]



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