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Method for quickly evaluating pollution of heavy metal in paddy soil

A heavy metal and paddy soil technology, which is applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problems of poor correlation of heavy metal enrichment, high detection limit, etc., achieve real-time pollution and widen the effect of application

Inactive Publication Date: 2015-02-18
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above problems, the technical problem to be solved by the present invention is how to avoid the problem of high detection limit when FPXRF measures the heavy metal content in the soil and the poor correlation between the heavy metal content in the soil and the heavy metal enrichment in the plant

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  • Method for quickly evaluating pollution of heavy metal in paddy soil
  • Method for quickly evaluating pollution of heavy metal in paddy soil
  • Method for quickly evaluating pollution of heavy metal in paddy soil

Examples

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Embodiment 1

[0025] The rice plants used in this example come from rice fields in Chenzhou, Hunan and Qiyang, and the content of heavy metal arsenic in the soil is 10 mg kg -1 to 90mg kg -1 . The measuring instrument is a portable X-ray fluorescence spectrometer (FPXRF), the model is XL3t series, and the production company is NITON Corporation of the United States.

[0026] The concrete steps of this embodiment are:

[0027] 1) Collect the rice root system and rhizosphere soil when they are mature and ready to be harvested, and the accumulation of iron film on heavy metals is not less than 90% of the total heavy metal content in the root system;

[0028] 2) Carry out soil removal, water washing, drying and shredding pretreatment on the above-mentioned rice root system; wherein, the drying step is to dry in an oven at 70°C for more than 96 hours, and the dry weight of the obtained sample is not less than 1.2g, and the particle size Not more than 1mm, thickness not less than 6.14mm;

[0...

Embodiment 2

[0037] The rice plants used in this example come from rice fields in Chenzhou, Hunan and Qiyang, and the content of heavy metal arsenic in the soil is 10 mg kg -1 to 90mg kg -1 . The measuring instrument is a portable X-ray fluorescence spectrometer (FPXRF), the model is XL3t series, and the production company is NITON Corporation of the United States.

[0038] The concrete steps of this embodiment are:

[0039] 1) Collect the rice root system and its stems, leaves and seeds when they are mature and ready to be harvested, and the accumulation of heavy metals in the iron film is not less than 90% of the total heavy metal content in the root system;

[0040] 2) Carry out soil removal, water washing, drying and shredding pretreatment on the above-mentioned rice root system; wherein, the drying step is to dry in an oven at 70°C for more than 96 hours, and the dry weight of the obtained sample is not less than 1.2g, and the particle size Not more than 1mm, thickness not less tha...

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Abstract

The invention discloses a method for quickly evaluating pollution of heavy metal in paddy soil. According to the method, the content of heavy metal in a paddy root system is measured by FPXRF (field portable X-ray fluorescence) so as to evaluate the pollution of the heavy metal in the paddy soil. The method comprises the following concrete steps: (1) pre-treating the acquired paddy root system; (2) performing extraction on the pre-treated paddy root system by a sodium hydrosulfite-sodium citrate-sodium bicarbonate process; (3) measuring the concentration of one or more heavy metal in extraction liquid by the FPXRF; (4) calculating the content of one or more heavy metal in the paddy root system according to the measurement value in the step (3), and further evaluating the pollution of the heavy metal in the paddy soil. The method has the characteristics of quickness, economy and high accuracy, and an effective evaluation method is provided for detecting food safety and soil heavy metal.

Description

technical field [0001] The invention belongs to the field of soil heavy metal pollution detection, and relates to a method for evaluating soil heavy metal pollution, in particular to a method for evaluating heavy metal pollution in paddy soil. Background technique [0002] Rice is the main food crop in China and throughout Asia. About 90% of the rice in the world is produced in Asia. China is the country with the largest rice production and rice consumption in Asian countries. However, heavy metals in the soil are commonly found in the main rice producing areas of our country. Heavy metals in paddy soil mainly enter the food chain through straw and rice, and then accumulate continuously to directly or indirectly endanger human health. Therefore, the assessment of arsenic contamination in paddy soil is one of the important tasks in food safety control and detection. The traditional evaluation methods for the effectiveness of heavy metals in paddy soil are: 1) point distribu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/223
Inventor 刘攀攀李宏陈正
Owner CHONGQING UNIV
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