Abstract
Soil culture experiments were carried out to study the effects of the mixture of cadmium (Cd) hyperaccumulator straw (Solanum nigrum L., Amaranthus chinense L., and Siegesbeckia orientalis L.) and phosphate rock on soil pH, available Cd content and soil nutrients in Cd polluted soil. The results showed that: (1) The soil pH was increased to a certain extent by three kinds of compound materials. (2) The contents of available potassium (AK) and available phosphorus (AP) in soil were increased to a certain extent by the three compounding materials, but there was no significant effect on total nitrogen (TN). And 2% phosphate rock powder and 1% Amaranthus chinense L. had the greatest increase in AP, reaching 49.28%, and 2% phosphate rock powder and 1% Siegesbeckia orientalis L. had the greatest increase in AK, reaching 136.23%. (3) The available Cd content in soil was reduced by three kinds of compound materials. The decrease of available Cd was the greatest in 2% phosphate rock powder and 1% Solanum nigrum L. straw mixed, which was 12.71%. In summary, the combination of Cd hyperaccumulator straw and phosphate rock powder can effectively passivate Cd in soil and improve soil nutrient content, and 2% phosphate rock powder and 1% Solanum nigrum L. straw are the best.
Highlights
Cadmium (Cd) pollution in soil has become a global environmental problem
(2) The contents of available potassium (AK) and available phosphorus (AP) in soil were increased to a certain extent by the three compounding materials, but there was no significant effect on total nitrogen (TN)
2% phosphate rock powder and 1% Amaranthus chinense L. had the greatest increase in AP, reaching 49.28%, and 2% phosphate rock powder and 1% Siegesbeckia orientalis L. had the greatest increase in AK, reaching 136.23%. (3) The available Cd content in soil was reduced by three kinds of compound materials
Summary
Cadmium (Cd) pollution in soil has become a global environmental problem. In 2014, the Chinese Ministry of Environmental Protection and the Ministry of Land and Resources jointly issued a national soil pollution bulletin, which showed that the total over-standard rate of soil in China was 16.1% [1,2]. Hyperaccumulated plants which can enrich heavy metals in excess, are mainly used for phytoremediation at present, but there are few reports on the passivation remediation with the mixture of straw and phosphate rock powder. In this experiment, the straw of Solanum nigrum L., Amaranthus chinense L., Siegesbeckia orientalis L and phosphate rock powder were used as materials to study the passivation effect of hyperaccumulator straw and phosphate rock powder on Cd in polluted soil, in order to provide a theoretical basis for the in-situ passivation remediation technology of Cd polluted soil
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