| 姚苹,郭欣,王亚婷,钟钦梅,张世熔,何玉亭.柠檬酸强化低浓度EDTA对成都平原农田土壤铅和镉的淋洗效率[J].农业环境科学学报,2018,37(3):448-455. |
| 柠檬酸强化低浓度EDTA对成都平原农田土壤铅和镉的淋洗效率 |
| Study on leaching of lead and cadmium in farmland soils by citric acid-enhanced low concentration EDTA in the Chengdu Plain |
| 投稿时间：2017-08-10 |
| DOI：10.11654/jaes.2017-1086 |
| 中文关键词: 柠檬酸 EDTA Pb Cd 水稻土 紫色土 复合淋洗 |
| 英文关键词: citric acid EDTA Pb Cd paddy soil purple soil composite washing |
| 基金项目:国家科技支撑计划（2012BAD14B18-02） |
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| 中文摘要: |
| 为了寻找绿色高效的土壤重金属修复技术，研究了柠檬酸与低浓度EDTA不同组合方式对成都平原两类污染农田土壤中Pb和Cd的淋洗率，并测定了淋洗前后土壤中有机质和基础养分含量。结果表明，EDTA单独淋洗时对水稻土Pb、Cd的最高淋洗率为44.94%和88.32%，对紫色土Pb、Cd的最高淋洗率为48.48%和71.85%。柠檬酸单独淋洗时对水稻土Pb、Cd的最高淋洗率为24.71%和69.38%，对紫色土Pb、Cd的最高淋洗率为33.54%和59.77%。柠檬酸与低浓度EDTA复合淋洗效果均优于单独淋洗，其中先EDTA再柠檬酸淋洗组合效果最好。相较于EDTA单独淋洗，该组合方式将水稻土中Pb、Cd的淋洗率分别提高了6.07%和9.67%，将紫色土中Pb、Cd的淋洗率均提高了10.33%和14.73%。同时，复合淋洗还能减少10%以上的土壤有机质与基础养分的流失。综合淋洗效率和土壤有机质及养分的变化，先用EDTA淋洗再用柠檬酸淋洗是最佳淋洗组合。 |
| 英文摘要: |
| Heavy metals adversely affect the safety of farmland soils in the Chengdu Plain. In order to determine high-efficiency remediation technology for heavy metals in these soils, this study investigated the removal efficiency of Pb and Cd from paddy and purple soils through different washing methods using citric acid and low concentration ethylenediaminetetraacetic acid(EDTA), and further analyzed the concentrations of organic matter and nutrients in soil. The results showed that the single method using 0.02 mol·L-1 EDTA removed 44.94% of Pb and 88.32% of Cd from paddy soil, and 48.48% of Pb and 71.85% of Cd from purple soil. Similarly, the single method using 0.1 mol·L-1 citric acid removed 24.71% of Pb and 69.38% of Cd from paddy soil, and 33.54% of Pb and 59.77% of Cd from purple soil. Compared with the two single methods, the combined methods of citric acid with low-concentration EDTA had higher metal removal efficiency. In addition, the highest removal efficiency was derived from the washing method using EDTA followed by citric acid. This composited washing method enhanced the removal efficiency of Cd and Pb by 6.07% and 9.67% for paddy soil, respectively, and the same indicators for purple soil by 10.33% and 14.73% more than the single method of EDTA washing. Simultaneously, this washing method also reduced the loss of organic matter and nutrients from soils by over 10% more than the other methods. In summary, the method using EDTA followed by citric acid is the most suitable for the removal of the two heavy metals and for conserving organic matter and nutrients among all the studied washing methods. |
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