Affiliation:
1. Department of Chemistry, Sikkim Manipal Institute of Technology, Sikkim Manipal University, Majitar, Rangpo-737136, India
2. Department of Soil Science & Agricultural Chemistry, Uttar Banga Krishi Viswa Vidyalaya, Pundibari-736165, India
Abstract
Humic acid and fulvic acid extracted from soils of cultivated areas, collected from Majitar, Darjeeling
and Pundibari cities were first isolated, purified and then characterized for the physico-chemical
properties (oxidizable organic carbon, electrical conductivity, pH, phosphorus, nitrogen, potassium,
CEC, etc.). The physico-chemical studies showed that soils were neutral to acidic but are independent
of altitude. Organic carbon, available phosphorus, nitrogen were higher with soil of Majitar city. The
total acidity, carboxylic group, phenolic -OH group were higher in fulvic acid than in humic acid.
Further, both acids were characterized by potentiometric titration, viscometric measurement, surface
tension and spectral analysis. The humification index (E4/E6) of fulvic acid was relatively higher than
humic acid. The highest molecular weight of humic acid and fulvic acid were recorded 13645.83 and
1465.54, respectively.
Publisher
Asian Journal of Chemistry
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