College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, China; Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, Liaoning, 110016, China; Key Laboratory of Original Agro-environmental Pollution Prevention and Control, Ministry of Agriculture/Tianjin Key Laboratory of Agro-environment and Safe-product, Tianjin, 300191, China.
College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, China.
Environ Pollut. 2021 Jan 15;269:116198. doi: 10.1016/j.envpol.2020.116198. Epub 2020 Dec 1.
Cadmium (Cd) and lead (Pb) are toxic heavy metals that impact human health and biodiversity. Removal of Cd/Pb from contaminated soils is a means for maintaining environmental sustainability and biodiversity. In this study, we applied a newly modified material fly ash (NA), zeolite (ZE), and fly ash (FA) to the paddy soils and evaluated the effects of Cd/Pb accumulation in rice via a one-year field experiment. The results showed that the application of NA and ZE enhanced the soil pH and nutrients to a large extent and reduced the availability of Cd/Pb in soil. The Cd and Pb concentrations in rice grains decreased by 32.8% and 62.9%, respectively, with the NA treatments. Similarly, the application of ZE reduced the Cd and Pb concentrations in rice grains by a factor of 27.9% and 63.5%, respectively, which indicates that the amendments can promote the transfer of Cd and Pb from acid-exchangeable fraction to oxidizable and residual fractions. The Cd/Pb showed a significant positive correlation to other metal ions and a negative correlation to the nutrients. Generally, the application of NA and ZE was effective in reducing Cd/Pb accumulation and improving rice yield. Moreover, the NA was more cost-effective than ZE. Hence, this study proves that NA may be a better amendment for remediation of Cd/Pb contaminated soils.
镉（Cd）和铅（Pb）是有毒重金属，会影响人类健康和生物多样性。从污染土壤中去除 Cd/Pb 是维持环境可持续性和生物多样性的一种手段。在这项研究中，我们将一种新改性材料粉煤灰（NA）、沸石（ZE）和粉煤灰（FA）应用于稻田土壤中，并通过为期一年的田间试验评估了 Cd/Pb 在水稻中的积累效应。结果表明，NA 和 ZE 的应用在很大程度上提高了土壤的 pH 值和养分含量，降低了土壤中 Cd/Pb 的有效性。NA 处理使稻米中 Cd 和 Pb 的浓度分别降低了 32.8%和 62.9%。同样，ZE 的应用使稻米中 Cd 和 Pb 的浓度分别降低了 27.9%和 63.5%，这表明这些改良剂可以促进 Cd 和 Pb 从可交换态向可氧化态和残渣态的转移。Cd/Pb 与其他金属离子呈显著正相关，与养分呈显著负相关。总的来说，NA 和 ZE 的应用能有效降低 Cd/Pb 的积累，提高水稻产量。此外，NA 的成本效益优于 ZE。因此，本研究证明 NA 可能是修复 Cd/Pb 污染土壤的更好的改良剂。
