Reflectance UV-VIS and UV Resonance Raman spectroscopy in characterization of kraft pulps

Anni Lähdetie (Corresponding Author), Tiina Liitiä, Tarja Tamminen, Anna-Stiina Jääskeläinen

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)


Reflectance UV-Vis spectroscopy and UV resonance Raman (UVRR) spectroscopy are both nondestructive techniques that are applicable to study trace concentrations of lignin in-situ. In this study, unbleached and bleached softwood kraft pulps were analyzed by reflectance UV-Vis (k/s) and UVRR spectroscopy to follow lignin and hexenuronic acid (HexA) contents and structural changes in residual lignin. The height of the lignin band in the UV-Vis spectra (280 nm) correlated well with the lignin band in the UVRR spectra (1605 cm-1) for semi- or fully-bleached pulps. However, the correlation was much weaker for unbleached pulps. Also the results for hexenuronic acid content by UV-Vis (240 nm) and UVRR (1658 cm-1) methods correlated well for most of the pulps, but for unbleached or peroxide-bleached samples the interference from other structures affecting these bands was obvious.
Original languageEnglish
Pages (from-to)1600-1619
Number of pages20
Issue number4
Publication statusPublished - 2009
MoE publication typeA1 Journal article-refereed


  • Bleaching
  • Kraft pulps
  • UV resonance Raman (UVRR) spectroscopy
  • UV-Vis spectroscopy

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