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Application of Corrected Methods for High-Resolution XRF Core Scanning Elements in Lake Sediments

Authors :
Qi Liu
Lizeng Duan
Han Wu
Umar Ashraf
Wei Peng
Fengqin Chang
Yun Zhang
Hucai Zhang
Fengwen Liu
Xiaonan Zhang
Source :
Applied Sciences, Vol 10, Iss 8012, p 8012 (2020)
Publication Year :
2020
Publisher :
MDPI AG, 2020.

Abstract

Contemporary studies emphasize theoretical and analytical aspects of monitoring water quality within lacustrine settings. The X-ray fluorescence (XRF) core scanner provides the most rapid, non-destructive high-resolution elemental measurements for unprocessed sediments. However, the analytical precision of measured elemental composition may be offset due to water content and inhomogeneities in the physical properties of the sediment. A range of calibration approaches developed specifically for converting XRF scanning intensities to element fractions has been made available. Here, two lake sediment-cores retrieved from southwest China were used to evaluate the performance of various calibration methods. In particular, the influence of sediment properties on XRF scanning intensities was assessed by redundancy analyses (RDA) and the generalized additive model (GAM). The results demonstrate that for fine-grained sediments, the impact of grain size results in only minor deviations in the XRF scanning intensities. Water content of the lake sediment was shown to be the most important factor influencing the XRF scanning intensities, especially for light elements (e.g., Al to Fe). Significant decreases in XRF scanning intensities may occur when sediment water content is greater than 47%. We recommend testing the element fractions obtained via conventional techniques throughout the core and applying the multivariate log-ratio calibration for high-resolution XRF scanning elements within lake sediments.

Details

Language :
English
ISSN :
20763417
Volume :
10
Issue :
8012
Database :
OpenAIRE
Journal :
Applied Sciences
Accession number :
edsair.doi.dedup.....e4e97ccf721577f861b1ccfd14d2ad27