Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Effect of Acid Treatment on Dissolved Organic Carbon Retention by a Spodic Horizon.
Author Vance, G. F. ; David, M. B. ;
CORP Author Illinois Univ. at Urbana-Champaign.;Corvallis Environmental Research Lab., OR.
Publisher c1989
Year Published 1989
Report Number EPA/600/J-89/300;
Stock Number PB90-196593
Additional Subjects Carbon ; Agronomy ; Acidification ; Sulfates ; Graphs(Charts) ; Forestry ; Reprints ;
Library Call Number Additional Info Location Last
NTIS  PB90-196593 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/15/1990
Collation 9p
Processes involving the movement of organic substances in forest soils are not well understood. The study was conducted to examine the role of acidic inputs on dissolved organic carbon (DOC) mobility, processes affecting the retention of DOC by a B horizon, and SO4(2-) adsorption. Using O and B horizon samples from a Spodosol collected in a forested watershed in Maine, acid solutions leached through O, B, and O over B(O/B) soils in small vacuum extractor columns were analyzed for DOC, DOC fractions, and anions. For the O and O/B columns, DOC in the leachates decreased (7550 to 3350 and 2380 to 850 micro mol C/L, respectively) with an increase in acidic inputs; for the B horizon, the reverse was the case (435 to 1570 micro mol C/L. The DOC in leachates from the O horizon was dominated by hydrophobic and hydrophilic acids (68 and 20% of DOC with no acid addition), which were altered by acidic inputs (46 and 36% of DOC at p(H(1+))=2). The hydrophobic acid percentage in leachates from O/B horizon columns decreased from 52 to 28%, whereas hydrophilic acids increased from 27 to 47% with H2O and p(H(1+))=2 treatments, respectively. Ionic strength adjustment (I=0.01) of treatment solutions reduced C solubilization in O and O/B horizon leachates, leading to lower DOC leaching.