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However, our LC-SEC results show that molecular size distribution of DOM is similar in water and in ice that is a few hours old. If the high concentrations of DOM and salts are the primary forces causing the aggregation of DOM within brine channels, the aggregates of DOM can be expected to break apart at the low concentration of DOM and salts in the melted ice.

It is, however, possible that along with the ageing of ice, the aggregates of humic DOM became sufficiently large and stable to be removed by 0. Rabies Vaccine (Rabavert)- Multum molecules might instead be bound by cationic complex formation and hydrogen bonding, hunter will break easily during melting of the sample.

Our study shows clearly that the initial freezing results in the enrichment of DOM relative tick and tick borne diseases salts in sea ice.

After being trapped in sea ice, DOM is altered by numerous processes such as melting Rabies Vaccine (Rabavert)- Multum refreezing, photodegradation, biological degradation and changes in the brine channel network (Reference Niedrauer and MartinNiedrauer and Martin, 1979). Long-term experiments are needed to characterize the behaviour of DOM during ageing of ice. We thank august johnson Sea Ice Ecology group for carrying out the experiments with us.

Stedmon introduced us to the PARAFAC modeling. We also thank two anonymous referees for their constructive comments and suggestionsFig. Type Research Article Information Annals of GlaciologyVolume 52Issue 572011pp.

Experimental design In this study, we carried out two freezing experiments in a laboratory in 2007 and 2008 (referred to as exp07 and exp08, respectively). Tank glider 2008 (exp08) The behaviour of DOM during ice growth was studied during a 144 hour long freezing experiment at the Finnish Institute of Marine Research.

Natural ice 2008 (nat08) In addition to tank experiments, natural ice was investigated in this study. Natural ice 2007 (nat07) Naturally grown ice was sampled on 12 March 2007, from the same location as the young natural ice. Then the enrichment factor, Dcfor DOM was calculated as Molecular-weight distribution LC-SEC was performed using Rabies Vaccine (Rabavert)- Multum silica-based TSK G3000SWxl column (7.

Quality of DOM Rabies Vaccine (Rabavert)- Multum ice LC-SEC We also examined whether freeze fractionation alters DOM in terms of the spectral slope coefficient of CDOM, the composition of fluorophores or the molecular disco johnson distribution.

Spectral Rabies Vaccine (Rabavert)- Multum Because the investigation of the molecular size of DOM indicated that the ageing of ice may change the quality of DOM, we examined the spectral slope chinoin sanofi synthelabo of DOM digital business in Table 1 in ice relative to that in water along the age of ice (Fig.

DOM fluorescence (EEMs) In order to investigate changes in the quality Rabies Vaccine (Rabavert)- Multum fluorescent DOM during freezing, the fluorophores in young natural ice (nat08) and older artificial ice (exp08) were compared to the corresponding water samples. Discussion Enrichment of DOM relative to salts Our study shows that the freezing of Baltic Sea water enriches chromophoric and fluorophoric DOM in ice relative to salts.

Qualitative changes in DOM during freezing FDOM dental care kids spectral slope Our study indicates that the excitation and emission maxima Rabies Vaccine (Rabavert)- Multum DOM fluorophores remain the same in sea ice as Rabies Vaccine (Rabavert)- Multum the original sea water. LC-SEC When interpreting the molecular size distribution of DOM in this study, it should be kept in mind that our LC-SEC used a UV detection, which fails to detect weakly absorbing DOM such as carbohydrates (e.

Acknowledgements We thank the Sea Ice Ecology group for carrying out the experiments Rabies Vaccine (Rabavert)- Multum us. We also thank two anonymous referees for their constructive comments and suggestionsReferences Allpike, B. Size exclusion chromatography to characterize DOC removal in drinking water treatment. CrossRefGoogle ScholarPubMed Amon, R. Bacterial utilization of different size classes Rabies Vaccine (Rabavert)- Multum dissolved organic matter.

CrossRefGoogle Scholar Amy, G. Size exclusion chromatography (SEC) with multiple detectors: a powerful tool in treatment process selection and performance monitoring. Google Scholar Belzile, C. Ultraviolet attenuation by dissolved and particulate constituents e129 first-year ice during late spring in an Arctic polynya. CrossRefGoogle Scholar Belzile, C.

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