Differentiation Between Humic and Non-Humic Substances Using Alkaline Extraction and Ultraviolet Spectroscopy.

ABSTRACT:

Background

Although humic substances are the principal ingredients in processed humic products, there has been no practical way to determine if a material is humified, allowing fake products to be used by farmers instead of genuine humic substances.

Objective

To develop a test method using conventional laboratory techniques to determine if a material is humified.

Method

A neutralized extract is prepared using the standardized extraction protocols specified in ISO 19822:2018(E). A portion of the extract is used to determine the concentration of dissolved organic matter on an ash-free basis. A portion of the remaining neutralized extract is diluted to a concentration of 30 mg/kg of dissolved organic matter and transferred to a quartz UV cuvette for ultraviolet-visible (

SUBMITTER: Mayhew L 

PROVIDER: S-EPMC10156414 | biostudies-literature | 2023 May

REPOSITORIES: biostudies-literature