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800B Effect of Iron-Manganese Bimetals on As and Heavy Metals Composite_Omitted_Soiled Soil Passivation and Its Ecological Effects

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This research by the Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, discussed the impact of iron-manganese bimetallic materials on the passivation and restoration of As and heavy metal complex contaminated soils and their ecological effects. Published in the important journal .


Through the indoor simulated culture experiment, the effects of iron-manganese bimetal (FMBO) on the passivation and ecological effects of three As and heavy metal composite contaminated soils were studied. The results showed that the effective content of As and heavy metals in the contaminated soil decreased gradually with the increase of FMBO in the range of 0%~5%. Compared with the control, under the condition of 5% addition, As, Pb, The effective concentration of Cd, Zn and Cu decreased by 93.7%~100%, 30.8%~57.8%, 81.3%~95.0%, 66.7%~95.3%, 55.8%~100%, respectively. According to the results of seed germination experiment, when the amount of FMBO added was 2.5%, FMBO could attenuate the growth and development of plants in contaminated soil; when the addition amount was 2.5%, the growth of wheat seeds cultured in contaminated soil leaching solution Optimal, seed germination rate, root length and plant height can reach 86%~92%, 7.25~9.09 cm and 8.62~9.91 cm, respectively, and when the amount of FMBO added reaches 5%, it inhibits seed germination and growth. . According to the results of soil microbial diversity analysis, the FMBO material reduced the Shannon-Werner diversity index of soil microbes and changed the community composition. Therefore, before the passivation and repair of heavy metal contaminated soil, it is necessary to consider both the passivation effect and the ecological effect, and determine the optimal addition amount of the repair material.






The addition of FMBO material can reduce the effective content of As and heavy metals in the composite contaminated soil, and reduce the environmental risk. In the range of 0%~2.5%, FMBO can attenuate the growth and development of plants in contaminated soil. When the addition amount reaches 5%, due to the release of Mn2+, the seed germination and Growth produces inhibition. FMBO materials reduce microbial diversity in the soil and change community composition.


The total amount of As and heavy metal elements in the soil was determined by microwave digestion [16]. Weigh 0.2000g of 100 mesh sieve sample in Teflon digestion tank, add 9 mL concentrated nitric acid and 3 mL hydrofluoric acid, soak for 30 min, then put into microwave digestion instrument (XH-800B, Beijing Xianghu Technology) in the middle of the solution.