基于高分辨率模型的中国水稻籽粒中特定汞来源解析

IF 6.7 Q1 ENGINEERING, ENVIRONMENTAL
Yuying Cui, Qingru Wu, Kaiyun Liu, Shuxiao Wang*, Xun Wang, Tao Jiang, Bo Meng, Yurong Wu and Jia Guo, 
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引用次数: 3

摘要

食用稻米是人类接触汞的主要途径。为了追踪中国水稻颗粒汞的来源,采用单位细胞质量守恒法建立了网格分辨率为1 km × 1 km的水稻颗粒汞运移转化模型。2017年中国大米中模拟总汞(THg)和甲基汞(MeHg)浓度分别为0.08 ~ 243.6 μg/kg和0.03 ~ 238.6 μg/kg。全国稻米THg平均浓度的81.3%来自于大气汞沉降。然而,土壤的异质性,特别是土壤汞含量的变化,导致水稻THg在网格上分布较宽。全国稻米MeHg平均浓度的64.8%来自土壤汞。原位甲基化是水稻甲基汞浓度升高的主要途径。高汞输入和甲基化电位的耦合作用导致贵州部分网格及与周边省份交界的水稻MeHg极高。土壤有机质的空间变化对网格间甲基化电位有显著影响,特别是在东北地区。基于高分辨率的稻米THg浓度,我们确定了0.72%的网格为严重污染的THg网格(稻米THg >20μg /公斤)。这些网格主要对应有色金属冶炼、水泥熟料生产、汞和其他金属开采等人类活动的区域。因此,我们根据污染源的不同,提出了有针对性的控制水稻重污染的措施。此外,我们观察到不仅在中国,而且在世界其他地区,MeHg与THg比值的空间变化范围也很广,这突出了大米摄入的潜在风险。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Source Apportionment of Speciated Mercury in Chinese Rice Grain Using a High-Resolution Model

Source Apportionment of Speciated Mercury in Chinese Rice Grain Using a High-Resolution Model

Rice grain consumption is a primary pathway of human mercury exposure. To trace the source of rice grain mercury in China, we developed a rice paddy mercury transport and transformation model with a grid resolution of 1 km × 1 km by using the unit cell mass conservation method. The simulated total mercury (THg) and methylmercury (MeHg) concentrations in Chinese rice grain ranged from 0.08 to 243.6 and 0.03 to 238.6 μg/kg, respectively, in 2017. Approximately, 81.3% of the national average rice grain THg concentration was due to atmospheric mercury deposition. However, soil heterogeneity, especially the variation in soil mercury, led to the wide rice grain THg distribution across grids. Approximately, 64.8% of the national average rice grain MeHg concentration was due to soil mercury. In situ methylation was the main pathway via which the rice grain MeHg concentration was increased. The coupled impact of high mercury input and methylation potential led to extremely high rice grain MeHg in partial grids among Guizhou province and junctions with surrounding provinces. The spatial variation in soil organic matter significantly impacted the methylation potential among grids, especially in Northeast China. Based on the high-resolution rice grain THg concentration, we identified 0.72% of grids as heavily polluted THg grids (rice grain THg > 20 μg/kg). These grids mainly corresponded to areas in which the human activities of nonferrous metal smelting, cement clinker production, and mercury and other metal mining were conducted. Thus, we recommended measures that are targeted at the control of heavy pollution of rice grain by THg according to the pollution sources. In addition, we observed a wide spatial variation range of MeHg to THg ratios not only in China but also in other regions of the world, which highlights the potential risk of rice intake.

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来源期刊
ACS Environmental Au
ACS Environmental Au 环境科学-
CiteScore
7.10
自引率
0.00%
发文量
0
期刊介绍: ACS Environmental Au is an open access journal which publishes experimental research and theoretical results in all aspects of environmental science and technology both pure and applied. Short letters comprehensive articles reviews and perspectives are welcome in the following areas:Alternative EnergyAnthropogenic Impacts on Atmosphere Soil or WaterBiogeochemical CyclingBiomass or Wastes as ResourcesContaminants in Aquatic and Terrestrial EnvironmentsEnvironmental Data ScienceEcotoxicology and Public HealthEnergy and ClimateEnvironmental Modeling Processes and Measurement Methods and TechnologiesEnvironmental Nanotechnology and BiotechnologyGreen ChemistryGreen Manufacturing and EngineeringRisk assessment Regulatory Frameworks and Life-Cycle AssessmentsTreatment and Resource Recovery and Waste Management
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