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A method for monitoring the input and output balance of cultivated land cadmium

An input-output and balance technology, applied in the field of monitoring the cadmium input-output balance of cultivated land, can solve the problem that the dynamic change of soil cadmium content cannot be reflected, the influence of input or output cannot be excluded, and the contribution of cadmium pollution of cultivated land cannot be accurately monitored and evaluated. question

Inactive Publication Date: 2019-01-18
HUNAN AGRI BIOTECH RES CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the above monitoring methods have provided a large amount of data with reference value for the investigation of the source and pollution status of cadmium pollution in the national cultivated land, they have the following defects and deficiencies: (1) When the cultivated land soil has external cadmium pollution input, at the same time There is also the output of cadmium. By detecting the total cadmium content of the soil or planted crops, it can only reflect the increase or decrease of the soil cadmium content, and cannot reflect the dynamic changes of the input and output of the soil cadmium content.
(2) There are some deficiencies in using the total cadmium content of plants as an indicator of the severity of soil cadmium pollution. For example, the cadmium content of plants is easily affected by environmental factors such as soil physical and chemical properties, plant species and varieties, and cannot accurately reflect soil cadmium. (3) When monitoring the impact of a single pollution source, such as the aforementioned sewage irrigation and phosphate fertilizer, on the change of cadmium content in cultivated land, it is impossible to rule out the influence of other factors on the input or output of cadmium in cultivated land, and it is impossible to accurately monitor and evaluate a certain pollution source. Contribution of various pollution sources to cadmium pollution in cultivated land

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0040] 1. The solution of the labeled isotope Cd-111 reagent to be used is evenly sprayed on the powdery soil that has been ground and passed through a 20-mesh sieve in advance (the soil is obtained from the soil of the target cultivated land for testing, and is dried, ground, sieved, and quantified. ), further mix well, and the content of Cd-111 added with labeled isotopes can be controlled within the range of 0.1-1.0 mgCd-111 / kg. soil.

[0041] 2. Put the marked soil into a non-leak garden barrel with a height of more than 50cm and a diameter of about 20cm or other culture pots that are convenient for test operations. The amount of soil added to each pot is 15-20kg. After the soil settles and compacts, the thickness of the soil layer is about The soil isotope labeling is completed after soaking in water for at least 2 months to ensure that the soil and the labeled isotope are completely mixed evenly.

[0042] 3. At the same time when soil marking is completed, 15-20 kg of po...

Embodiment

[0070] 1. Soil isotope labeling: take several kg of soil from the tillage layer in the area to be monitored, dry it, crush it and sieve it. Then, weigh 15kg of the soil to be tested, take an acidic aqueous solution containing 15mg 97.21% Cd-111 reagent, evenly spray it on the soil, mix well while spraying, and transfer all of them into a 20cm diameter, high In a 52cm barrel-shaped PVC pot, rinse the container used for mixing soil with a small amount of water several times to exclude cadmium from the container and affect the accuracy of the data; pour the lotion into the PVC pot, add water to soak it up Soil, keep the water surface more than 1cm above the soil surface, soak for at least 2 months, and stir several times during the soaking period to ensure that the soil in the pot is evenly marked. In this way, more than 4 repeated pots were set up, and the soil in one of the repeated pots was taken as the initial soil sample-CKS control.

[0071] 2. At the end of September 2015...

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PUM

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Abstract

The present invention provides a method for monitoring the balance of cadmium input and output in cultivated land. Based on the principle that cadmium in nature is composed of 8 isotopes, and the abundance of each cadmium isotope in nature is constant, a method containing 8 kinds of cadmium is used. Any high-purity cadmium isotope material of the isotope is labeled on the soil to be tested, and plants are planted on the labeled soil to be monitored to obtain four samples, and the labeled cadmium isotope and the cadmium isotope not contained in the labeled material are measured. The amount can quantify the input and output of cadmium in pot soil, and can be used for long-term monitoring of the degree of soil cadmium external cadmium pollution and the balance and growth pattern of cadmium input and output; using the abundance of labeled cadmium isotopes in crops grown on labeled soil Changes can also more accurately reflect the actual contribution of cadmium input from external sources to cadmium pollution in crops and agricultural products, so as to monitor the input-output balance relationship of cadmium pollution in the soil to be monitored and the actual contribution rate of external cadmium pollution to cadmium pollution in crops and agricultural products.

Description

technical field [0001] The invention relates to the technical field of soil environment monitoring, and more particularly, to a method for monitoring the balance of cadmium input and output in cultivated land. Background technique [0002] Heavy metal pollution in soil has become a serious environmental problem affecting the quality and safety of agricultural products, among which cadmium pollution bears the brunt of the problem. The control of heavy metal pollution represented by cadmium has been highly valued by the Ministry of Agriculture, the Ministry of Science and Technology, and even the Central Committee of the Communist Party of China. It is urgent to study and formulate a feasible cadmium pollution control plan. The key to soil cadmium pollution control is to control and reduce source pollution. At present, the biggest dilemma facing basic research on cadmium pollution control is that although various sources of soil cadmium pollution have been basically understoo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/24
CPCG01N33/24G01N33/245
Inventor 彭伟正刘璐杨斌詹庆才陈静萍
Owner HUNAN AGRI BIOTECH RES CENT