Reduction of Isolation Period of Coal Humic Acids | Science Publications

American Journal of Applied Sciences

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