Análise comparativa de métodos de determinação de matéria orgânica em sedimentos turfosos de um testemunho sedimentar no Refúgio de Vida Silvestre dos Campos de Palmas

Abstract

This research tested the analysis of the organic matter content of a classic peatland, using the indirect method of wet organic carbon oxidation, called the Walkley-Black method. For this, a survey of references was carried out together with the laboratory analysis carried out at the Chemistry Laboratory of the Federal University of Fronteira Sul, Campus Chapecó. The main objective of the study is to compare different methods for determining the organic matter content in peaty sediments, specifically evaluating the Walkley-Black method, and comparing it with the Ignition Weight Loss (PPI) and Peroxide Burning methods of Hydrogen (H2O2) carried out by Soave (2023), from a classic peat bog located in the Campos de Palmas Wildlife Refuge (REVIS dos Campos de Palmas). Laboratory analyzes of sedimentary samples revealed that all methods are effective, but present variations in the results obtained. The Walkley-Black method stood out for its sensitivity and detail in the variation of organic matter contents along depths. In contrast, the PPI and H2O2 firing methods presented consistent and highly correlated results. It is concluded that all methods studied are suitable for determining organic matter in peat sediments, offering highly correlated profiles, despite variations in absolute values. The choice of method must consider the specificities of the study and the available resources.