Chemical speciation and distribution of potentially toxic elements in soilless cultivation of cucumber with sewage sludge biochar addition

Xie, Shengyu; Yu, Guangwei; Ma, Jianmin; Wang, Gang; Qichuan, Wang; You, Futian; Li, Jie; Yin, Wen; Li, Chunxing

doi:10.1016/j.envres.2020.110188

Cited by 19 publications

(12 citation statements)

References 67 publications

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“…5). These results indicate that corn growth has negative effects on the immobilization of PTEs, which was also observed in the soilless cultivation of plants (Xie et al 2020b). Throughout the growth stages, there were minor variations and the F4 fraction was the main chemical speciation of Cr and Pb in the soil, suggesting that these PTEs stably exist in soil and are adsorbed with difficulty by corn plants.…”

Section: Chemical Speciation Of Ptesupporting

confidence: 54%

“…In addition, the reduction in PTE bioaccumulation of SSB has been verified in other plants such as grass, Chinese cabbage, and tomato (Hossain et al 2010;Yu et al 2018;Yue et al 2017). In our previous study, we found that 5-10 wt% SSB is the suitable proportion to use in soilless cultivation, and only small amounts of the PTEs in biochar were taken up by cucumber plants (Xie et al 2020b). Nonetheless, the health risk associated with food consumption from applying SSB to agriculture needs further verification based on a field study.…”

Section: Introductionmentioning

confidence: 78%

“…The stem diameter was measured at a location 1 cm below the largest leaf. Further details have been described in our previous study (Xie et al 2020b). The dry weight of 100 niblets was measured and used as an important growth parameter.…”

Section: Analysis Methodsmentioning

confidence: 99%

“…The samples (0.5 g) were extracted in turn using 20 mL of acetic acid (0.11 mol/L), 20 mL of hydroxylamine hydrochloride (0.5 mol/L), 10 mL of hydrogen peroxide (30%) digestion, and 25 mL of ammonium acetate (1 mol/L). Detailed information has been reported in the previous study (Xie et al 2019(Xie et al , 2020b. Specifically, F1 is the fraction from acid-soluble or carbonate-combined metals, F2 is the fraction combined with iron and manganese oxides, F3 is the fraction associated with sulfur or organic matter, and F4 is the fraction bound to silicate minerals.…”

Section: Analysis Methodsmentioning

confidence: 99%

“…During the growth process, the soil concentrations of Cr, Ni, Cu, Zn, and As showed decreased trends, indicating that these PTEs migrated from soil into corn plants. Moreover, the concentrations of Mn, Cd, and Pb varied irregularly due to the synergy between organic matter decomposition and plant uptake (Li et al 2017;Xie et al 2020b). Minor differences were also observed between CK and other treatments with the addition of SSB at the maturity stage.…”

Section: Total Pte Concentrationsmentioning

confidence: 99%

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Moderate sewage sludge biochar application on alkaline soil for corn growth: a field study

Xie

Jiang

et al. 2021

Biochar

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In view of the risks induced by the inhibitory effects of applying impracticably large amounts of sewage sludge biochar (SSB) to the alkaline soil, this field study investigated the influence of moderate biochar amendments (0, 1500, 4500, and 9000 kg/hm2) on corn growth, alkaline soil properties, and the uptake of potentially toxic elements (PTEs). The results showed that applying more SSB would decrease the ammonium nitrogen concentration and increase the available phosphorus and potassium concentrations, which inhibited corn plant growth because of high background nutrient levels of the alkaline soil. When the alkaline soil was amended with 1500 kg/hm2 SSB, the dry weight of 100 niblets increased from 32.11 g in the control to 35.07 g. There was no significant variation in the total concentration of PTEs in the soil. The concentrations of Mn, Ni, Cu, and Zn in niblets decreased from 5.54, 0.83, 2.26, and 27.15 mg/kg in the control to 4.47, 0.62, 1.30, and 23.45 mg/kg, respectively. Accordingly, the health risk from corn consumption was significantly reduced. Furthermore, the combination of SSB and fertilizer improved corn growth and reduced the risk of consumption of PTEs. Therefore, considering the increase in corn fruit yield and the decrease in consumption risk, applying 1500 kg/hm2 of biochar to alkaline soils is a realistically achievable rate, which can broaden the utilization of SSB for remediation of different types of soil.

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Section: Chemical Speciation Of Ptesupporting

confidence: 54%