The Changes of Mg2+ Mass Concentration in MgO NPs Suspension and Its Effects on the Growth of Wheat （Triticum aestivum L.） under Different pH

doi:10.19894/j.issn.1000-0518.210383

Chinese Journal of Applied Chemistry ›› 2022, Vol. 39 ›› Issue (9): 1401-1411.DOI: 10.19894/j.issn.1000-0518.210383

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The Changes of Mg²⁺ Mass Concentration in MgO NPs Suspension and Its Effects on the Growth of Wheat （Triticum aestivum L.） under Different pH

Jia-Xin GUO, Yang LIU, Chang-Shan XU(), Xiao-Nan LIU, Liang CHENG

Key Laboratory of UV-Emitting Materials and Technology，Ministry of Education，Northeast Normal University，Changchun 130024，China

Received:2021-07-30 Accepted:2022-04-21 Published:2022-09-01 Online:2022-09-08
Contact: Chang-Shan XU
About author:csxu@nenu.edu.cn
Supported by:
the National Natural Science Foundation of China(11374046)

Abstract

Abstract:

When MgO NPs are widely used， they will be leaked into the growth environment of plants. The pH value of the environment will also affect the release of metal ions from nanoparticles and their interaction with plants. In this study， wheat （Triticum aestivum L.）， which was largely planged in China， was chosen as the test subject for the investigation of the mass concentration changes of Mg²⁺ ions in MgO NPs suspension at different pH values and its effects on wheat growth via ion-selective microelectrod. The results showed that the mass concentration of Mg²⁺ gradually increased with time and stabilized after 48 h. Adjusting the pH value of the suspenstion to acidic values promoted the release of Mg²⁺. For the 80 mg/L MgO NPs suspension， the mass concentration of Mg²⁺at pH=6.5 was 24.31 mg/L， increased significantly as compared with that in the unadjusted suspension， 31.47 mg/L. At the same time， this adjustment also increased the absorption of Mg²⁺ by wheat， thereby， to a certain extent， reduced the inhibitory effect of MgO NPs on wheat growth.

Key words: MgO NPs, Mg²⁺, Wheat, Ion selective microelectrode, pH value

CLC Number:

O657.1

Jia-Xin GUO, Yang LIU, Chang-Shan XU, Xiao-Nan LIU, Liang CHENG. The Changes of Mg²⁺ Mass Concentration in MgO NPs Suspension and Its Effects on the Growth of Wheat （Triticum aestivum L.） under Different pH[J]. Chinese Journal of Applied Chemistry, 2022, 39(9): 1401-1411.

Figures/Tables 10

Fig.1 Changes of Mg2+ mass concentration in （A） uncultivated and （B） cultivated wheat at different mass concentrations of MgO NPs suspensions within 48 h

Fig.2 Fitting curves of Mg2+ release mass concentrations when MgO NPs suspension is 20 （A）， 50 （B）， 80 （C） and 100 mg/L （D） under uncultivated and cultivated wheat conditions

Fig.3 （A） Statistical diagram of the time t0 required for the Mg2+ mass concentration to reach saturation in the MgO NPs suspension with the mass concentration of 20， 50， 80 and 100 mg/L under uncultivated and cultivated wheat；（B） Statistic diagram of the mass concentration change rate of Mg2+ in first 4 h

Table 1 pH changes in DI water caused by the cultivation of wheat

时间

Time/h

0.5

pH值

pH value

Table 2 pH changes in MgO NPs （80 mg/L） suspension with/without wheat cultivated in it

时间

Time/h

0.5

pH （未培养小麦

uncultivated wheat）

pH （培养小麦

cultivated wheat）

Fig.4 （A） Average net growth and （B） average plant height of wheat germination stage treated with different mass concentrations of MgO NPs suspensions for 3 days；（C） Morphology of wheat treated with MgO NPs suspension for 3 days （The processing mass concentration is 0， 20， 40， 50， 60， 70， 80 and 100 mg/L， from left to right）

Fig.5 Statistical diagram of the average plant height of wheat after 7 days of treatment with MgO NPs suspensionNote： The illustration is the physiognomy of wheat plant height （from left to right： 0， 40， 60 and 80 mg/L）

Fig.6 Statistics of the net growth of the roots of wheat treated in different mass concentrations of Mg2+ solution for 3 days at the rooting stage

Fig.7 Changes of Mg2+ mass concentration in MgO NPs suspensions at different pH values in uncultivated （A） and cultivated （B） wheat within 48 h

Fig.8 At different pH values，（A） The net growth of wheat roots treated with MgO NPs suspension at a mass concentration of 80 mg/L；（B） wheat morphology after 3 days of cultivation

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The Changes of Mg²⁺ Mass Concentration in MgO NPs Suspension and Its Effects on the Growth of Wheat （Triticum aestivum L.） under Different pH

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