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Updated: Mar 28, 2026

Quantification of Humic and Fulvic Acids in Humate Ores, DOC, Humified Materials and Humic Substance-Containing Commercial Products
Published on: March 18, 2022
Evaluation of salinity effect on quantitative analysis of aquatic humic substances using nonionic DAX-8 resin
Morimaru Kida1, Toshiyuki Ohtsuka2, Taku Kato1
1Graduate School of Agricultural Science, Kobe University, 1 Rokkodai, Nada, Kobe, Hyogo 657-8501, Japan.
Abstract:
A nonionic macroporous resin, Amberlite(®) XAD-8, or its substitute, Supelite™ DAX-8, is used when isolating or quantifying aquatic humic substances (AHS). However, the effect of salinity on the adsorption behavior of AHS onto the resin is yet to be confirmed, rendering the possibility of salinity-induced changes in the values of quantified amounts or characteristics of AHS obtained from a salty system. To verify the results of quantification and isolation of AHS using the resin in different salinity systems, the effect of salinity on such quantitative analyses of AHS has been examined. It has been concluded that the salinity effect is in general trivial and will not hinder comparison of results regardless of sample solution salinity.
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