Journal of Ecology and Rural Environment ›› 2019, Vol. 35 ›› Issue (4): 522-528.doi: 10.19741/j.issn.1673-4831.2018.0416

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Deactivation Effects of Deactivators on Cadmium and Plumbum Polluted Soil at Different Times

TIAN Xue1,2, ZHOU Wen-jun1,2, ZHANG Zheng-rui1,2, LI Jun-juan1,2, GAO Yu-hui1   

  1. Shenzhen Wenke Landscape Co. Ltd., Shenzhen 518026, China;
    2. Guangdong Provincial Landscape Architecture and Ecological Restoration Engineering Technology Research Center, Shenzhen 518026, China
  • Received:2018-07-17 Online:2019-04-25 Published:2019-04-25


The objective of this study is to identify deactivations and characteristics of 6 different deactivators on cadmium and plumbum in soil within 90 days. For this purpose, the passivation process and characteristic of cadmium and plumbum deactivators, which were prepared by sepiolite, attapulgite and lime, were studied by soil culture experiment in lab. The effects of constituents and proportions on passivation process and characteristic were also explored. The results indicated that the deactivating rate of Cd which was deactivated by deactivators[except sepiolite and lime(1:2)]increased with time, and the deactivating rate was more than 45% in the 90th day. During the 90 days, the deactivating rate of Pb which was deactivated by deactivators[except sepiolite and lime(1:2)]reached the maximum at the 90th day. At the same time, the deactivators which include attapulgite also had the high deactivating rates of Pb(>50%), which was more than 50%. In the single material treatment, the passivation effect of Cd and Pb which was deactivated by sepiolite was better than attapulgite. In the compound amendment treatments, the deactivating rate of Cd which was deactivated by deactivators[except sepiolite + lime(1:2)]were higher than Pb. And the passivation effect of deactivators which were prepared from clay mineral and lime by the rate of 1:2 was better than the one with rate of 2:1. The deactivation capability of deactivators on Pb excelled on Cd. The deactivation capability of the passivator which were prepared from attapulgite and lime by the rate of 1:2 had the strongest passivation abilities for both Cd and Pb. The order of capacity values was attapulgite + lime(1:2) > attapulgite=attapulgite + lime(2:1)=sepiolite > sepiolite + lime(1:2) > sepiolite + lime(2:1).

Key words: deactivators, cadmium, plumbum, soil, deactivation, heavy metal pollution

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