Method for analyzing cadmium element pollution in rice seeds

Abstract

The invention discloses a method for analyzing cadmium element pollution in rice seeds. The method comprises the following steps: I, testing Cd isotope ratios deltaA, deltaB and deltat of a pollutionsource A and a pollution source B in soil and rice seeds respectively; II, calculating a contribution rate fA of the pollution source A to the cadmium element in the rice seeds according to a source analysis equation (1) as shown in the specification, wherein in the equation, deltat is a cadmium element isotope ratio in rice seeds to be analyzed; alpha is a cadmium element isotope fractionation coefficient in soil to rice seeds; deltaA is the cadmium element isotope ratio in the pollution source A; deltaB is the cadmium element isotope ratio of the pollution source B; and the rice seeds to beanalyzed are harvested from the soil. By adopting the method, isotope ratios in different pollution sources and rice seeds are introduced into equations, and together with correction of the fractionation coefficient alpha, quantitative analysis on the source of cadmium pollution in the rice seeds can be precisely implemented, and the contribution rates of different pollution sources to cadmium inrice seeds can be confirmed.

Description

technical field [0001] The invention belongs to the technical field of food safety and relates to a method for analyzing the source of cadmium element pollution in rice grains. Background technique [0002] With the development of industrial mining industry, my country's environment, especially heavy metal pollution in cultivated soil, is gradually exposed. According to the survey results of the Ministry of Environmental Protection and the Ministry of Land and Resources, the rate of cadmium (Cd) in my country's soil exceeds the standard by about 7%, of which heavy cadmium The proportion of pollution points is 0.5%. Cadmium content in about 10%-20% rice grains (ie rice) exceeds the standard. Analyzing the sources of cadmium pollution in rice grains is a prerequisite for controlling cadmium pollution in rice. [0003] There are 8 isotopes of Cd element in the environment, which are 106 Cd, 108 Cd, 110 Cd, 111 Cd, 112 Cd, 113 Cd, 114 Cd and 116 Cd, because the cadmium ...

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Problems solved by technology

[0006] However, because the determination of Cd isotope in rice grains is relatively complicated, and there is a fractionation effect between the Cd isotope in rice grains and the Cd isotope in soil, that is, due to the selective absorption of rice, the Cd isotope in soil and the isotope in rice grains There will be differences in the ratio, and the result of Cd isotope traceability will be biased if the fractionation coefficient is not considered

For these reasons, there is still no isotope tracer-based method for determining the source of Cd pollution in rice grains (including other crops)

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