G. Newcombe et al., INFLUENCE OF CHARACTERIZED NATURAL ORGANIC MATERIAL ON ACTIVATED CARBON ADSORPTION .1. CHARACTERIZATION OF CONCENTRATED RESERVOIR WATER, Water research, 31(5), 1997, pp. 965-972
Natural organic material (NOM) from Myponga Reservoir in South Austral
ia was concentrated and fractionated using ultrafiltration into nomina
l molecular weight fractions <500, 500-3000, 3000-10,000, 10,000-30,00
0 and >30,000. The fractions were characterised using how field-flow f
ractionation, C-13 NMR, colour determination and potentiometric titrat
ion. The ultrafiltration fractions displayed a gradual transformation
from highly coloured, highly branched,high carbohydrate structures to
compounds with a prevalence of long chain aliphatic carbon with much l
ower carbohydrate content and colour. There were no clear trends in th
e carboxyl content of the fractions, as determined by both NMR and tit
ration. Analysis of the titration data showed evidence of three distin
ct types of carboxyl groups and the same types of groups were present
in each fraction. (C) 1997 Elsevier Science Ltd.