Geochemical Behaviors of Rare Earth Elements (REEs) in Karst Soils under Different Land-Use Types: A Case in Yinjiang Karst Catchment, Southwest China.

Ruiyin Han,Zhifang Xu

doi:10.3390/ijerph18020502

Abstract

The geochemical characteristics of rare earth elements (REEs) can be employed to identify the anthropogenic and natural influence on the distributions of REEs in soils. A total of 47 soil samples from the three soil profiles of the secondary forest land, abandoned cropland, and shrubland in the Yinjiang county of Guizhou province, southwest China, were collected to determine the contents and distribution of REEs in the soil environment. The total REEs (ΣREE) contents in different soil profiles are in the following sequence: secondary forest land (mean: 204.59 mg·kg−1) > abandoned cropland (mean: 186.67 mg·kg−1) > shrubland (mean: 139.50 mg·kg−1). The ratios of (La/Gd)N and (Gd/Yb)N ranged from 0.62 to 1.00 and 1.18 to 2.16, which indicated that the enrichment of the medium rare earth elements (MREEs) was more obvious than that of the light rare earth elements (LREEs) and the heavy rare earth elements (HREEs). The phenomenon could be attributed to the preferential absorption of MREEs by fine particles and the substitution of Ca2+ by MREEs. Most soil samples were characterized by the negative Ce anomalies (anomalies values: 0.30–1.10) and positive Eu anomalies (anomalies values: 0.43–2.90). The contents of REEs in the profiles of secondary forest land and shrubland were mainly regulated by soil pH and Fe contents while clay content and agricultural activities were the main controlling factors in the soil profile of abandoned cropland. This study highlights the role of agricultural activities in affecting the distributions of REEs in karst soils, which could provide some insights for the protection of the soil environment.

Highlights

Rare earth elements (REEs) usually comprise the 15 lanthanide elements from La to Lu, and these elements are similar in chemical properties [1,2]
Based on the atomic weight, REEs can be divided into the light rare earth elements (LREEs, from La to Sm), the medium rare earth elements (MREEs, from Eu to Dy), and the heavy rare earth elements (HREEs, from Ho to Lu) [3,4]
The REEs contents tend to increase with soil depth in spite of a positive peak in the soil horizons of 20–90 cm of the three soil profiles, which is related to the leaching loss during soil development [67]

Summary

Introduction

Rare earth elements (REEs) usually comprise the 15 lanthanide elements from La to Lu, and these elements are similar in chemical properties [1,2]. The fractionation of REEs is usually accompanied by the variations of environmental parameters due to the stable chemical properties of REEs in the soil environment [5]. With the changes in redox conditions [6,7,8]. The great Ce and Eu anomalies always occur with the increasing chemical activities, which can be used to denote the changes in soil environment reversely. Exogenous input can interfere with the geochemical behaviors of REEs (such as the enrichment or the fractionation of REEs) under natural conditions [10,11].

Methods

Results

Conclusion