Remediation and Safe Production of cd Contaminated Soil Via Multiple Cropping HyperaccumulatorSolanum nigrum L. and Low Accumulation Chinese Cabbage

Abstract

Multiple crop experiment of hyperaccumulator Solanum nigrum L. with low accumulation Chinese cabbage Fenyuanxin 3 were conducted in a cadmium (Cd) contaminated vegetable field. In the first round, the average removal rate of S. nigrum to Cd was about 10% without assisted phytoextraction reagent addition for the top soil (0-20 cm) with Cd concentration at 0.53-0.97 mg kg(-1) after its grew 90 days. As for assisted phytoextraction reagent added plots, efficiency of Cd remediation might reach at 20%. However, in the second round, Cd concentration in Chinese cabbage was edible, even in the plots with assisted phytoextraction reagent added. Thus, multiple cropping hyperaccumulator with low accumulation crop could normally remediate contaminated soil and produce crop (obtain economic benefit) in one year, which may be one practical pathway of phytoremediating heavy metal contaminated soil in the future.

The influence of compost and nitrilotriacetic acid on mercury phytoextraction by Lepidium sativum L.

“…33 However, the study of Niu et al demonstrated that the removal rate for Cd hyperaccumulating species Solanum nigrum cultivated for 90 days was equal to an average of 11% in unassisted phytoextraction and increased twice for the process assisted by combined use of glycine, glutamic acid and cysteine. 60 In the present study the pot experiment took only 7 days. This short period of time enabled Hg to be removed at a rate of almost 20% for the process assisted by compost + NTA.…”

Phytoextraction of cadmium-contaminated soil and potential of regenerated tobacco biomass for recovery of cadmium

“…Two approaches were used to determine phytoextraction efficiency: (1) Cd removal efficiency from the top soil (0–20 cm) expressed in terms of the decline percentage of overall soil concentration 42 ; and (2) Cd removal efficiency from top soil in a theoretical case, calculated as % of soil metal removed by one crop = (plant metal concentration × biomass)/(soil metal concentration × soil mass in the rooting zone) × 100 43 , 44 . For comparative purposes, these two methods were adopted in this study to evaluate the phytoextraction efficiency of Cd from soil by regenerated tobacco.…”

Mine spoil remediation via biochar addition to immobilise potentially toxic elements and promote plant growth for phytostabilisation

“…Broadhurst and Chaney 2016). Co-cropping with hyperaccumulating plants may, however, provide more potential here for achieving both spoil stabilisation and phytoremediation because it would combine the biomass, surface coverage and below-ground exudates of ryegrass with the hyperaccumulating capacity of species such as yellowtuft (Alyssum murale) or black nightshade (Solanum nigrum) (Broadhurst and Chaney 2016;Niu et al 2015). Even so, phytoremediation is at best a very long term strategy, with some estimates for the time taken to achieve remediation success put at decades to hundreds or even thousands of years (Tschan et al 2009;Suman et al 2018).…”