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Pore-water chemistry explains zinc phytotoxicity in soil

Kader, Mohammed ; Lamb, Dane T ; Correll, Ray ; Megharaj, Mallavarapu ; Naidu, Ravi

Ecotoxicology and Environmental Safety, December 2015, Vol.122, pp.252-259 [Tạp chí có phản biện]

ISSN: 0147-6513 ; E-ISSN: 1090-2414 ; DOI: 10.1016/j.ecoenv.2015.08.004

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  • Nhan đề:
    Pore-water chemistry explains zinc phytotoxicity in soil
  • Tác giả: Kader, Mohammed ; Lamb, Dane T ; Correll, Ray ; Megharaj, Mallavarapu ; Naidu, Ravi
  • Chủ đề: Soil Solution ; Soil Toxicology ; Dissolved Organic Carbon ; Plants ; Ecology ; Public Health
  • Là 1 phần của: Ecotoxicology and Environmental Safety, December 2015, Vol.122, pp.252-259
  • Mô tả: Zinc (Zn) is a widespread soil contaminant arising from a numerous anthropogenic sources. However, adequately predicting toxicity of Zn to ecological receptors remains difficult due to the complexity of soil characteristics. In this study, we examined solid–solution partitioning using pore-water data and toxicity of Zn to cucumber ( L.) in spiked soils. Pore-water effective concentration (EC , =10%, 20% and 50% reduction) values were negatively related to pH, indicating lower Zn pore water concentration were needed to cause phytotoxicity at high pH soils. Total dissolved zinc (Zn ) and free zinc (Zn ) in soil-pore water successfully described 78% and 80.3% of the variation in relative growth (%) in the full dataset. When the complete data set was used (10 soils), the estimated EC50 was 450 and 79.2 µM for Zn and Zn , respectively. Total added Zn, soil pore water pH (pH ) and dissolve organic carbon (DOC) were the best predictors of Zn and Zn in pore-water. The EC10 (total loading) values ranged from 179 to 5214 mg/kg, depending on soil type. Only pH measurements in soil were related to EC total Zn data. The strongest relationship to EC overall was pH , although pH and pH were in general related to Zn EC . Similarly, when a solution-only model was used to predict Zn in shoot, DOC was negatively related to Zn in shoot, indicating a reduction in uptake/ translocation of Zn from solution with increasing DOC.
  • Ngôn ngữ: English
  • Số nhận dạng: ISSN: 0147-6513 ; E-ISSN: 1090-2414 ; DOI: 10.1016/j.ecoenv.2015.08.004

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