Screening of on high efficiency passivators of heavy metal mercury and its rational application

doi:10.16178/j.issn.0528-9017.20230035

Abstract

Abstract:

Due to the increasing industrial activities, mining and smelting, misuse of pesticides and chemical fertilisers, the trend of metal contamination in agricultural soils is becoming increasingly serious due to many factors, such as the random disposal of waste piles. The aim is to prevent and control heavy metal mercury contamination in agricultural soils and to ensure the ecological safety of agricultural soils. Based on a literature review and previous research, five commercially available passivators were selected, and indoor soil culture simulations and field trials were used to screen for highly effective heavy metal Hg passivators and their appropriate application techniques. The application of soil passivation remediation materials in the soil culture simulation experiment promoted the conversion of free Hg to the stable state in the soil. The best results were obtained with the application of agricultural lime and seafoam (ratio 1:1), which was significantly lower than other passivators or combination formulations (P<0.05), and the application of organic passivators significantly improved rice growth indicators. The application of two ratios of passivators, agricultural lime and seafoam (ratio 1:1) and biochar and seafoam (ratio 1:1), was also effective in reducing the enrichment of Hg in rice seeds. The difference in passivation effect between the passivator treatments in the field trial was not significant (P>0.05). There was also no significant effect of the passivator treatments on rice growth indicators. No Hg enrichment was detected in the rice grains with the different passivators, indicating a high level of grain safety. Soil cultivation experiments and field trials showed that all five passivators and combination formulations significantly reduced the effective soil Hg content, with the best results achieved by applying agricultural lime and seafoam (ratio 1:1) at a rate of 3 000 kg·hm^-2.

Key words: agricultural soils, passivation, mercury activity, rational application, contamination remediation

CLC Number:

CHEN Zhenhua, ZHANG Xuefang. Screening of on high efficiency passivators of heavy metal mercury and its rational application[J]. Journal of Zhejiang Agricultural Sciences, 2025, 66(4): 1042-1047.

Figures/Tables 8

Table 1 Material inputs to passivator test plots

处理	材料	小区用量/kg
T1	农用石灰+海泡石	4
T2	生物质炭+海泡石	4
T3	腐殖酸复合钝化剂	6
T4	牡蛎壳为主要原料的土壤调理剂	4
CK	空白	0

Fig.1 Layout of the test plot for screening Hg passivator and rational application techniques

Fig.2 Effective Hg content of soil in the soil culture experiment

Fig.3 Effect of passivators on rice growth indicators under soil culture conditions

Table 2 Effect of passivators on Hg enrichment in rice seeds under soil culture conditions

处理	水稻籽粒Hg含量平均值/(mg·kg^-1)
CK	0.010
T	—
S	—
F	0.001
M	0.001
限定值	0.020

Fig.4 Effect of passivators on changes in the effective Hg content of soil under field conditions

Fig.5 Effect of passivators on rice growth indicators under field conditions

Table 3 Effect of passivated materials on Hg enrichment in rice seeds under field conditions

处理	水稻籽粒Hg含量平均值/(mg·kg^-1)
CK	0.004 9
T1	—
T2	—
T3	0.003 6
T4	0.003 2
限定值	0.020 0

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