EJPAU 2005. Gołębiowska D. , Osuch M. , Mielnik L. , Bejger R. OPTICAL CHARACTERISTICS OF HUMIC ACIDS FROM BOTTOM SEDIMENTS OF LAKES WITH DIFFERENT MICTIC TYPES

Electronic Journal of Polish Agricultural Universities (EJPAU) founded by all Polish Agriculture Universities presents original papers and review articles relevant to all aspects of agricultural sciences. It is target for persons working both in science and industry,regulatory agencies or teaching in agricultural sector. Covered by IFIS Publishing (Food Science and Technology Abstracts), ELSEVIER Science - Food Science and Technology Program, CAS USA (Chemical Abstracts), CABI Publishing UK and ALPSP (Association of Learned and Professional Society Publisher - full membership). Presented in the Master List of Thomson ISI.

2005
Volume 8
Issue 2

Topic:

Environmental Development

ELECTRONIC
JOURNAL OF
POLISH
AGRICULTURAL
UNIVERSITIES

Gołębiowska D. , Osuch M. , Mielnik L. , Bejger R. 2005. OPTICAL CHARACTERISTICS OF HUMIC ACIDS FROM BOTTOM SEDIMENTS OF LAKES WITH DIFFERENT MICTIC TYPES, EJPAU 8(2), #27.
Available Online: http://www.ejpau.media.pl/volume8/issue2/abs-27.html

OPTICAL CHARACTERISTICS OF HUMIC ACIDS FROM BOTTOM SEDIMENTS OF LAKES WITH DIFFERENT MICTIC TYPES

Dorota Gołębiowska, Marta Osuch, Lilla Mielnik, Romualda Bejger
Department of Physics, University of Agricultural, Szczecin, Poland

ABSTRACT

Optical properties of humic substances (HS) from bottom sediments of two dimictic and meromictic lakes with similar depth (25 m and 29 m) and different thermal circulation and oxygen condition of their water were carried out. Dimictic Marta Lake (ML) and meromictic Czarne Lake (CL) are situated not wide apart, in Drawno National Park, North Poland. Optical analysis: differences UV-VIS - absorption spectra and fluorescence emission spectra were analysed for characterisation of humic acids (HA). HA were taken from bottom sediments of three thermal zones of lakes. All HA from profundal bottom sediments have a bigger UV absorption than HA from littoral. They testify lower degree of oxidative transformation of HA from profundal zone. It was assumed that fluorescence yield of HA from profundal of CL is a few times bigger, than this from profundal of ML. In all humic acids (HA) from profundal zone chromofor (l = 405 nm) and fluorofor (l = 480 nm) originated probably from reduced cytochrom c structure is present. Humic acids molecules are characterised by some exciting and emission centers, which testify their possibility of intermolecular transfer of energy. Coefficients (Kf=I_FL/A) proportional to FL yield were calculated. Observed difference of fluorescence yield level indicates the presence of a few time more fluorescent centers in HA from profundal of meromictic than dimictic lake.

Key words: humic acids, bottom sediments, UV-VIS absorption, fluorescence.

Dorota Gołębiowska
Department of Physics,
University of Agricultural, Szczecin, Poland
Papieża Pawła VI nr 3, 71-459 Szczecin, Poland
email: fizyka@agro.ar.szczecin.pl

Marta Osuch
Department of Physics,
University of Agricultural, Szczecin, Poland
Papieża Pawła VI nr 3, 71-459 Szczecin, Poland

Lilla Mielnik
Department of Physics,
University of Agricultural, Szczecin, Poland
Papieża Pawła VI nr 3, 71-459 Szczecin, Poland

Romualda Bejger
Department of Physics,
University of Agricultural, Szczecin, Poland
Papieża Pawła VI nr 3, 71-459 Szczecin, Poland

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