Cadmium (Cd) and Nickel (Ni) Distribution on Size-Fractioned Soil Humic Substance (SHS)
| Autor: | Yi-Lung Yeh, Teng-Pao Chiu, Wei-Shiang Huang, Sheng-Hsien Hsieh, Ting-Chien Chen |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
cadmium and nickel
Health Toxicology and Mutagenesis SHS separation lcsh:Medicine chemistry.chemical_element optical indicators 010501 environmental sciences complex mixtures 01 natural sciences Article Metal Soil Nickel Dissolved organic carbon Soil Pollutants Chemical composition Humic Substances multilinear regression 0105 earth and related environmental sciences soil humic substances (SHS) [Me]/[DOC] ratios Total organic carbon Cadmium lcsh:R Public Health Environmental and Occupational Health Agriculture 04 agricultural and veterinary sciences chemistry visual_art Soil water 040103 agronomy & agriculture visual_art.visual_art_medium 0401 agriculture forestry and fisheries Mass fraction Environmental Monitoring Nuclear chemistry |
| Zdroj: | International Journal of Environmental Research and Public Health Volume 16 Issue 18 International Journal of Environmental Research and Public Health, Vol 16, Iss 18, p 3398 (2019) |
| ISSN: | 1660-4601 |
| DOI: | 10.3390/ijerph16183398 |
| Popis: | Soil humic substances (SHS) are heterogeneous, complex mixtures, whose concentration, chemical composition, and structure affect the transport and distribution of heavy metals. This study investigated the distribution behavior of two heavy metals [cadmium (Cd) and nickel (Ni)] in high molecular weight SHS (HMHS, 1 kDa&ndash 0.45 &mu m) and low molecular weight SHS (LMHS, < 1 kDa) extracted from agricultural soils. The HMHS mass fractions were 45.1 ± 19.3%, 17.1 ± 6.7%, and 57.7 ± 18.5% for dissolved organic carbon (DOC), Cd, and Ni, respectively. The metal binding affinity, unit organic carbon binding with heavy metal ratios ([Me]/[DOC]), were between 0.41 ± 0.09 &mu mol/g-C and 7.29 ± 2.27 &mu mol/g-C. Cd preferred binding with LMHS (p < 0.001), while Ni preferred binding with HMHS (p < 0.001). The optical indicators SUVA254, SR, and FI were 3.16 ± 1.62 L/mg-C/m, 0.54 ± 0.18 and 1.57 ± 0.15, respectively for HMHS and 2.65 ± 1.25 L/mg-C/m, 0.40 ± 0.17, and 1.68 ± 0.12, respectively for LMHS. The HMHS contained more aromatic and lower FI values than LMHS. Multilinear regression showed a significant positive correlation between the measured predicted [Me]/[DOC] ratios (r = 0.52&ndash 0.72, p < 0.001). The results show that the optical indices can distinguish the chemical composition and structure of different size SHS and predict the binding ability of Me-SHS. |
| Databáze: | OpenAIRE |
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