Abstract
Humic acid (HA) is usually defined in the soil and aquatic sciences as that fraction of base-soluble soil organic matter or dissolved organic matter (DOM) which is insoluble in acid. Stepwise titration of bulk DOM from four samples of bog pore water and stream water were undertaken to study the fractional precipitation of HA. Three independent methods: DOC analysis, absorbance measurements at 330 nm, and densitometry of photographic negatives of filters, were used to quantify the precipitation of HA. Half of the HA which would be precipitable at pH 2.0 can be precipitated at pH values from 3.4 to 4.6. These preliminary results have implications for the stability of DOM in waters that experience pH decreases, and for the capacity of DOM to complex metals.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
