| 张雪,刘笑生,沈露露,崔红标.老化作用对巨菌草茎生物炭内源铜镉活性的影响[J].农业环境科学学报,2020,39(3):563-571. |
| 老化作用对巨菌草茎生物炭内源铜镉活性的影响 |
| Effects of ageing on the availability of endogenous copper and cadmium in biochar derived from Pennisetum sp. Stems |
| 投稿时间：2019-09-12 |
| DOI：10.11654/jaes.2019-1009 |
| 中文关键词: 生物炭 内源重金属 形态 浸出毒性 老化作用 |
| 英文关键词: biochar endogenous heavy metal speciation leaching toxicity ageing effect |
| 基金项目:国家自然科学基金项目（41601340） |
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| 摘要点击次数: 1616 |
| 全文下载次数: 1611 |
| 中文摘要: |
| 为明确老化作用如何影响生物炭内源重金属活性，本研究以清洁区（红壤）和重金属污染区（九牛）种植的巨菌草（茎）所制备的生物炭为研究对象，采用TCLP和BCR连续提取法分析干湿交替（DW）、冻融循环（FT）及酸化（AF）老化前后生物炭内源铜（Cu）、镉（Cd）浸出毒性和形态分布，并运用风险评价指数RAC评估其潜在环境风险。结果表明：相较于干湿交替和酸化老化，冻融循环更显著地增加了生物炭内源Cu、Cd的浸出毒性，使九牛和红壤生物炭TCLP-Cu分别增加了50.6%和571%，TCLP-Cd增加了161%和620%。三种老化作用促进了九牛和红壤生物炭内源Cu、Cd从中间形态向酸溶态转化，增加了两种生物炭内源Cu、Cd的RAC值，且冻融对生物炭内源Cu、Cd的潜在风险影响最为显著。研究表明，老化作用增加了生物炭内源Cu、Cd的活性，提高了其潜在的生态风险。 |
| 英文摘要: |
| The effects of ageing on the availability of endogenous heavy metals in biochar are unclear. In this study, two biochars with different concentrations of endogenous Cu and Cd were produced from the stems of Pennisetum sp. that were planted in clean soil(Hongrang Station; HR)and polluted soil(Jiuniu Village; JN). After ageing using dry-wet cycles(DW), freeze-thaw cycles(FT), and acidification(AF), the leaching toxicity and speciation distribution of Cu and Cd in the two biochars were investigated using the toxicity characteristic leaching procedure(TCLP)and the method proposed by the Community Bureau of Reference(BCR), respectively. Meanwhile, the potential ecological risk of endogenous Cu and Cd in the two biochars was assessed using the risk assessment code(RAC). The results showed that the leachability of Cu and Cd in the two biochars after FT ageing were higher than those after DW and AF. The leachable contents of Cu in the JN and HR biochars after FT ageing were increased by 50.6% and 571%, respectively, and those of Cd were increased by 161% and 620%, respectively. Moreover, all the ageing processes promoted the transformation of Cu and Cd from the oxidizable and reducible fractions to the acid-soluble fraction and increased the RAC values of endogenous Cu and Cd in the two biochars. In particular, the FT ageing process was the most effective at increasing the potential risk of endogenous Cu and Cd in the two biochars. This study showed that the ageing processes increased the availability of endogenous Cu and Cd in the two biochars and enhanced their potential ecological risk. |
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