Characteristics of Heavy Metal Pollution of Coix Seed and Soil from Its Producing Area in Guizhou Province

Cen Ruxiang; Zhang Wang; Wei Xiaolao; Fu Tianling; He Tengbing

doi:10.13961/j.cnki.stbctb.2021.01.015

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Characteristics of Heavy Metal Pollution of Coix Seed and Soil from Its Producing Area in Guizhou Province

- Characteristics of Heavy Metal Pollution of Coix Seed and Soil from Its Producing Area in Guizhou Province
- Bulletin of Soiland Water Conservation Vol. 41, Issue 1, Pages: 103-111(2021)
- 作者机构：
  
  1. 贵州大学农学院,贵州,贵阳,550025
  2. 贵州大学新农村发展研究院,贵州,贵阳,550025
  3. 贵州省山地畜禽养殖污染控制与资源化技术工程实验室,贵州,贵阳,550025
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2021.01.015
  CLC： X825
- Published：2021
- 稿件说明：
移动端阅览
Cen Ruxiang, Zhang Wang, Wei Xiaolao, et al. Characteristics of Heavy Metal Pollution of Coix Seed and Soil from Its Producing Area in Guizhou Province[J]. Bulletin of Soiland Water Conservation, 2021, 41(1): 103-111.
DOI：

Cen Ruxiang, Zhang Wang, Wei Xiaolao, et al. Characteristics of Heavy Metal Pollution of Coix Seed and Soil from Its Producing Area in Guizhou Province[J]. Bulletin of Soiland Water Conservation, 2021, 41(1): 103-111. DOI： 10.13961/j.cnki.stbctb.2021.01.015.

摘要

[目的] 探明黔产薏苡仁及其产地土壤重金属污染特征，为黔产薏苡仁产业可持续发展及其产地土壤重金属防控提供科学依据。[方法] 以黔西南薏苡仁及其产地土壤为供试样品，分析测定土壤pH值、有机质、阳离子交换量（CEC）和5种重金属元素镉（Cd）、铅（Pb）、锌（Zn）、铜（Cu）、镍（Ni）的含量，运用GIS和单因子污染风险评价等方法，探讨土壤重金属空间分布和土壤重金属污染对薏苡仁品质安全的影响。[结果] ①土壤中5种重金属Cd，Pb，Zn，Cu和Ni含量范围分别为0.01~1.35，10.09~34.70，80.39~236.36，22.54~131.42，26.75~137.76 mg/kg，其中，Cd，Cu和Ni的最大值均高于国家现行标准（GB15 618-2018），表明研究区土壤中主要存在一定范围的Cd，Cu和Ni污染风险；综合污染指数为1.94，污染等级为轻度污染。②薏苡仁中Cd，Pb，Zn，Cu和Ni含量范围分别为未检测到~0.027，0.179~1.348，42.615~58.961，10.028~16.244，0.552~5.045 mg/kg，Cd未超标，而Pb，Zn，Cu和Ni均有不同程度的超标，超标率依次为90%，25%，75%和30%；薏苡仁对Pb具有很强的累积效应。[结论] 通过同步采集土壤样品和对应的薏苡仁样品，分析结果能更好地评估土壤重金属污染对薏苡仁品质安全的影响。

Abstract

[Objective] The heavy metal pollution of Coix seed and soil in its producing area were studied to provide a scientific basis for the sustainable development of the Guizhou Coix seed industry and the prevention and control of heavy metals in the soil of its origin.[Methods] The Coix seed and the soil of its producing area were used as the test samples. The soil pH value

organic matter

cation exchange capacity

and five heavy metal elements

such as cadmium (Cd)

lead (Pb)

zinc (Zn)

copper (Cu)

and nickel (Ni) were determined using geographic information system and single-factor pollution risk assessment methods to explore the spatial distribution of soil heavy metals and the impact of soil heavy metal pollution on the quality and safety of Coix seeds.[Results] ① The Cd

and Ni contents in the soil ranged from 0.01 to 1.35

10.09 to 34.70

80.39 to 236.36

22.54 to 131.42

and 26.75 to 137.76 mg/kg

respectively

of which the maximum values of Cd

and Ni were higher than the current national standard (GB15618-2018)

indicating that there was a certain range of Cd

and Ni pollution risk in the soil in the study area. The comprehensive pollution index was 1.94

and the pollution level was light pollution. ② The contents of Cd

and Ni in the Coix seed ranged from not detected to 0.027

0.179 to 1.348

42.615 to 58.961

10.028 to 16.244

and 0.552 to 5.045 mg/kg

respectively. Cd did not exceed the standard

while Pb

and Ni exceeded the standard by varying degrees

with the exceeding rates being 90%

25%

75%

and 30%

respectively. Coix seed had a strong cumulative effect of Pb.[Conclusion] By simultaneously collecting soil samples and corresponding Coix seed samples

the analysis results can be used to evaluate the impact of soil heavy metal pollution on the quality and safety of Coix seed.

关键词

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