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| Content characteristics and correlation of organic carbon and heavy metals in aggregates of wastewater irrigation soil of Guiyang |
| Received:March 23, 2021 Revised:March 25, 2021 |
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| DOI：10.3969/j.issn.2095-1035.2021.05.006 |
| KeyWord:wastewater irrigation area; soil; aggregate; organic carbon; heavy metals; correlation |
| Author | Institution |
| LIU Wenzheng |
贵州省疾病预防控制中心 |
| JIA Yaqi |
贵州省环境科学研究设计院 |
| YING Zhong |
贵州省疾病预防控制中心 |
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| Abstract: |
| Organic carbon and heavy metal concentrations in different sizes of soil aggregates in wastewater irrigated vegetable soils of Guiyang were studied. Simultaneous determination of six heavy metals in soil by ICP-MS with microwave digestion. The concentration of organic carbon was measured in soil aggregates with different particle sizes by hydration heat potassium dichromate oxidation colorimetry. The correlation between organic carbon and heavy metals were analyzed in different sizes of soil aggregates in wastewater irrigated vegetable soils. Results showed that >2 mm soil aggregate was largest, being about 75%. The highest contents of heavy metals were distributed in the 0.25-0.5 mm aggregate for Cu, Zn, Cd and Pb, and in the 5-8 mm aggregate for Cr, while there was no difference among the concentration of As in different size aggregates. The content of different heavy metals decreased with increasing of the depth of soil layer. Heavy metal enrichment factors in polluted soil was Cu>Pb>Cd>Zn>Cr>As, the highest distribution factor of heavy metals were showed in the 0.25-0.5 mm aggregate for Cu, Zn, Cd and Pb, and the 5-8 mm particle size aggregates had the largest loading factor of heavy metals. The soil organic carbon content as a whole increased first and then decreased with the aggregate particle size increasing. The contents of Cu, Cd, Pb and As in different particle size aggregates were positively correlated with organic content (p<0.05). The highest significantly enriched of heavy metals were showed in the 5-8 mm aggregate for Cr and As in the wastewater irrigation soil. Cu, Zn, Cd, and Pb show significant enrichment characteristics in the 0.25-0.5 mm particle size aggregates. The six heavy metals have the highest mass load factors in the 5-8 mm particle size aggregates, indicating that the six heavy metals occupy the most contribution in the 5-8 mm particle size aggregates. |
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