American Journal of Applied Sciences | |
Reduction of Isolation Period of Coal Humic Acids | Science Publications | |
Nik M.A. Majid1  Mohamadu B. Jalloh1  Claudia H.H. Chen1  Osumanu H. Ahmed1  | |
关键词: Coal; humic acids isolation; extraction period; fractionation period; | |
DOI : 10.3844/ajassp.2009.1327.1330 | |
学科分类:自然科学(综合) | |
来源: Science Publications | |
【 摘 要 】
Problem statement: The isolation of Humic Acids (HA) from coal is laborious, costly and time consuming. The extraction and fractionation periods of HA vary from 4 h to 7 days. Fractionation period ranges from 12-24 h. However, most studies use 24 h as extraction period and also 24 h as fractionation period. This study was conducted to investigate whether the isolation period for HA of coals could be reduced. Approach: Different extraction periods using 0.1 M NaOH (4, 8, 12, 16, 20 and 24 h) were tested. Samples were centrifuged (16,211 G for 15 min) at the end of each extraction period. The dark-colored supernatant liquor containing HA was decanted and the pH of solution was adjusted to 1.0 using 6 M HCl. After acidification, the fractionation periods evaluated were 4, 8, 12, 16, 20 and 24 h. The samples were transferred to a polyethylene bottle and centrifuged (16, 211 G for 10 min) after each fractionation period. The HA purification was done by suspending them in 50 mL distilled water and centrifuged (16,211 G for 10 min). HA samples were dried in an oven at 40
【 授权许可】
Unknown
【 预 览 】
Files | Size | Format | View |
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RO201911300036880ZK.pdf | 50KB | download |