Abstract
Thiocyanate (SCN−) is frequently detected in the environmental matrix due to various industrial activities such as the coking wastewater and gold mining operations, thus posing a potential threat to living organisms. In the present study, we conducted a hydroponic experiment to investigate the effects of ammonium (NH4+) and nitrate (NO3−) fertilization on uptake kinetics of SCN− by rice seedlings. Inhibition rate (IR) of relative growth was used as a response endpoint to quantify the adverse effect of SCN− exposure to rice seedlings. Uptake kinetics of SCN− by rice seedlings was estimated by Michaelis–Menten equation using MATLAB 2018b. The results showed that the IR values of SCN-treated young seedlings fed with NO3− at 57.4 mg/L (30%) were higher than that at 15.24 mg NH4+/L (30%). However, the IR value of SCN-treated seedlings fed with NH4+ at 35.56 (70%) and 50.8 mg/L (100%) were higher than those of 122.43 (70%) and 174.9 mg NO3−/L (100%). A linear uptake mode for SCN− uptake was observed in the N starvation treatment, whereas exponential curves for SCN− uptake were observed in other N fertilization treatments. The calculated Michaelis–Menten kinetics (i.e., Vmax and Km) for SCN− uptake by rice seedlings fed with NO3− were higher than those of NH4+ addition. In conclusion, NH4+ fertilization resulted in more negative impact on the uptake of SCN− by rice seedlings than NO3− treatments, thus mitigating the phytotoxicity of SCN− to rice seedlings.
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This work was financially supported by the National Natural Science Foundation of China (No: 41761094).
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XZY and YPL conceived and supervised the study. QZ and HZ conducted the chemical analysis. YXF contributed to the data analysis and figure preparation. YXF drifted the manuscript. XZY reviewed and edited the manuscript. All of the authors contributed to the final review of the manuscript.
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Xiao-Zhang Yu has received the Grants from the National Natural Science Foundation of China. The other authors Qing Zhang, Yu-Xi Feng, Hua Zhang and Yan-Peng Liang declare that they don’t have any conflict of interest.
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Zhang, Q., Feng, YX., Yu, XZ. et al. Effects of nitrogen fertilization on removal kinetics of thiocyanate (SCN−) in rice seedlings. Int. J. Environ. Sci. Technol. 17, 4291–4298 (2020). https://doi.org/10.1007/s13762-020-02769-y
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DOI: https://doi.org/10.1007/s13762-020-02769-y