DH Lee, SH Kim,
HS Shin - Journal of Soil and Groundwater …, 2015 - koreascience.kr
A sample of soil humic acid (HA) was divided by ultrafiltration (UF) into five fractions of
different molecular size (UF 1:> 300, UF 2: 100~ 300, UF 3: 30~ 100, UF 4: 10~ 30, UF 5: 1 …