Abstract
Crops, particularly in the Northeast region of Mexico, have to cope with increasing soil salinization due to irrigation. Chloride (Cl−) concentration has been strongly related to enhance cadmium (Cd) uptake by plants due to increased solubility in the soil solution. The effect of irrigation with slightly saline water from a local well was evaluated in this work on the accumulation and translocation of Cd in Swiss chard (Beta vulgaris L.) grown in soil historically amended with stabilized sewage sludge under a regime of phosphorus and zinc fertilization. A factorial pot experiment was conducted with two phosphate fertilizer levels (PF, 0 and 80 kg ha−1 dry soil, respectively), two Zn levels (0 and 7 kg ha−1 dry soil), and two sources of water for irrigation deionized water (DW) and slightly saline well water (WW) from an agricultural site. Additionally, a human risk assessment for Cd ingestion from plants was assessed. Results showed that Cl− salinity in the WW effectively mobilized soil Cd and increased its phytoavailability. A higher level of Cd was found in roots (46.41 mg kg−1) compared to shoots (10.75 mg kg−1). Although the total content of Cd in the edible parts of the Swiss chard irrigated with WW exceeded permissible recommended consumption limit, bioavailable cadmium in the aboveground parts of the plant in relation to the total cadmium content was in the range from 8 to 32 %. Therefore, human health risks might be overestimated when the total concentration is taken into account.
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Acknowledgments
This study was supported by the research fund of PROMEP and CONACYT through grants PROMEP/103.5/11/4330 and CONACYT-167372, respectively. The authors wish to thank M.Sc. Laura E. García-Campos for providing soil and assistance with soil characterization.
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Valdez-González, J.C., López-Chuken, U.J., Guzmán-Mar, J.L. et al. Saline irrigation and Zn amendment effect on Cd phytoavailability to Swiss chard (Beta vulgaris L.) grown on a long-term amended agricultural soil: a human risk assessment. Environ Sci Pollut Res 21, 5909–5916 (2014). https://doi.org/10.1007/s11356-014-2498-3
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DOI: https://doi.org/10.1007/s11356-014-2498-3