ISOLATION AND ANALYSIS OF LIGNIN-DERIVED PHENOLS IN AQUATIC HUMIC SUBSTANCES - IMPROVEMENTS ON THE PROCEDURES

Procedures for the extraction of aquatic humic substances and analysis of their lignin-derived phenols were assessed and altered to simplify and shorten XAD-8 resin cleaning, reduce losses due to sorption, and optimize oxidative release of phenols without increasing their transfo rmation. The revised cleaning procedures require 5 rather than 120 h a nd sorptive losses of humic acids were reduced 7%. Coefficients of var iation for individual phenols in the final method ranged from 1 to 11% . The method was used to analyze lignin-derived phenols in White Clay Creek watershed humics, Suwannee River humics (IHSS), and Lake Washing ton sediments. (C) 1998 Elsevier Science Ltd. All rights reserved.