Vol. 8, Issue 6 (2020)
Ratio of elements in humic acids extracted from restored mine soil as a measure of quality of carbon sequestered
Author(s): Preeti Singh and AK Ghosh
Abstract: Mining land loses large amounts of C (carbon) due to loss of topsoil and mechanical mixing of soil horizons. Biological reclamation of this soil stimulates SOC sequestration. A chronosequence study consisting of 8, 14 and 25years old reclaimed mine soils under Azadirachta indica,Gmelina arborea, Dalbergia sissoo at Gevra, Chhattisgarh, India was initiated to quantify the composition and ratios of humic acid. Carbon content of humic acid was highest in the case of Azadirachta indica followed by Gmelina arborea and Dalbergia sissoo. It had increased from 34.95% to 41.94%, 16.31% to 28.65% and 18.50% to 21.16% for Azadirachta indica, Dalbergia sissoo and Gmelina arborea with increase in year of reclamation for surface soil. Humic acid nitrogen content was found highest in the case of Azadirachta indica followed by Dalbergia sissoo and Gmelina arborea. N (%) in humic acid ranged from 1.29 for Gmelina arborea and 2.65 for Azadirachta indica. Highest C/N ratio was observed in case of Gmelina arborea. The C/N ratios of HA fractions ranged from 30.91 in Gmelina arborea to 15.27 in Azadirachta indica plantations. In case of C/H ratio, it ranged from 6.26 to 15.01 in restored mine soils. Thus, C/H ratio was significantly differing with slightly wider ratios in increasing depths. From elemental composition, it is evident that HAs contained more C than N and H. From the results of experiment we can say that humic acid C and N content improved with increase in year of reclamation due to enrichment in TOC and process of humification.
DOI: 10.22271/chemi.2020.v8.i6s.10948
Pages: 1343-1346 | 411 Views 69 Downloads
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How to cite this article:
Preeti Singh, AK Ghosh. Ratio of elements in humic acids extracted from restored mine soil as a measure of quality of carbon sequestered. Int J Chem Stud 2020;8(6):1343-1346. DOI: 10.22271/chemi.2020.v8.i6s.10948
