Quality reference values of trace elements in Brazilian organosols

Area of Science:

• Environmental Science
• Soil Science
• Geochemistry

Background:

• Organosols are fragile soil types requiring monitoring.
• Natural background levels and quality reference values (QRVs) are essential for trace element assessment in organosols.
• Understanding trace element behavior is vital for soil health and environmental management.

Purpose of the Study:

• To determine QRVs for trace elements in Brazilian organosols.
• To correlate soil properties, specifically iron (Fe) and carbon (C) content, with trace element occurrence.
• To develop classification functions for grouping organosol samples based on trace element profiles.

Main Methods:

• Analysis of pseudo-total trace element content in 40 organic soil horizon samples from Brazil.
• Cluster analysis to group soil samples based on trace element concentrations.
• Identification of influential soil variables (Fe and C content) for classification functions.

Main Results:

• Three distinct groups of organosols were identified using cluster analysis.
• Iron (Fe) and Carbon (C) contents significantly influenced trace element concentrations.
• QRVs were proposed based on the 75th percentiles of the identified soil groups.

Conclusions:

• The proposed classification functions are effective for allocating new samples into established groups.
• These functions can potentially be used to estimate the degradation level of organosols.
• Establishing QRVs is critical for effective environmental monitoring of organosols.