Natural organic matter in the Nordic Countries (NOMiNiC): 1. TOC intercalibration 2. Physico-chemical characteristics of DOM

Summary

This report consists of to parts: 1. DOM intercalibration. 25 chemical laboratories in the Nordic countries determined the amount of organic and inorganic carbon in a set of 10 samples that included natural and synthetic fresh and isolated sample material. The results have been statistically interpreted by means of e.g. Youlden analysis. 2. Physico-chemical characterisation of Nordic DOM. DOM in spring and fall precipitation, throughfall, soil water and surface water from 5 Nordic sites has been determined for their main physical and chemical characteristics. DOM in surface waters have been reverse osmosis isolated and are being determined for numerous characteristics. The largest variation in the characteristics of DOM is between seasons and between the various water compartments in a site.