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| Status and risk analysis of copper and zinc pollution in livestock manure |
| Received:February 20, 2020 |
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| KeyWord:livestock manure;copper;zinc;risk;threshold |
| Author Name | Affiliation | E-mail | | YUAN Kai | College of Resources and Environment, China Agricultural University, Beijing 100193, China | | | XIONG Su-ya | College of Resources and Environment, China Agricultural University, Beijing 100193, China | | | LIANG Jing | Weihai Soil and Solid Waste Pollution Prevention and Control Center, Shandong Province, Weihai 264200, China | | | LI Yan-ming | College of Resources and Environment, China Agricultural University, Beijing 100193, China | | | QIAO Yu-hui | College of Resources and Environment, China Agricultural University, Beijing 100193, China | qiaoyh@cau.edu.cn | | LI Hua-fen | College of Resources and Environment, China Agricultural University, Beijing 100193, China | | | CHEN Qing | College of Resources and Environment, China Agricultural University, Beijing 100193, China | |
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| Abstract: |
| To study the current situation regarding heavy metal Cu and Zn in livestock manure and the risk of soil pollution from the application thereof in China, data from previously published work and our own study was collected and used to analyze the content of Cu and Zn in livestock manure. A risk assessment model was established to predict the potential of soil Cu and Zn pollution with the application of livestock manure and estimate thresholds for Cu and Zn in livestock manure. The study indicated that the content of Cu and Zn in different livestock manure is quite different, and the content of Zn is higher than that of Cu. Pig manure has the highest Cu and Zn content, with median values of 406.9 mg·kg-1 and 671.3 mg·kg-1; sheep manure has the lowest Cu and Zn content, with median values of 28.7 mg·kg-1 and 101.1 mg·kg-1, respectively. The accumulation rate of Cu and Zn in soil is 12 080.0 g·hm-2·a-1 and 18 928.4 g·hm-2·a-1 respectively with the application of pig manure. The accumulation rate of Cu and Zn in soil with the application of poultry manure was 1 396.4 g·hm-2·a-1 and 7 978.1 g·hm-2·a-1, respectively. The risk of contamination from cow and sheep manure is low. According to the threshold calculated using our model, the threshold range of Cu is 80.8~2 256.6 mg·kg-1, and the threshold range of Zn is 1 322.4~20 040.9 mg·kg-1. The risk of pollution from manure is negatively related to its threshold; pig manure has the lowest threshold with the highest pollution risk, with threshold ranges for Cu and Zn of 80.8~163.2 mg·kg-1 and 1 322.4~1 972.8 mg·kg-1, respectively. |
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