Dietary heavy metal chronic exposure assessment method based on beta binomial normal distribution

Abstract

The invention relates to a dietary heavy metal chronic exposure assessment method based on beta binomial normal distribution, and the method mainly comprises the steps: calculating the intake of pollutants of an investigated crowd in the number of days of investigation through the consumption data obtained through investigation and data obtained through literature retrieval or pollutant monitoring, and then building a linear random effect model, the variation of dietary survey is decomposed into intra-human variation and inter-human variation, the positive intake is calculated after the intra-human variation is removed, finally, the dietary frequency of the crowd is obtained through computer simulation and sampling, the dietary frequency is multiplied by the usual intake calculated in the first part, and the long-term intake level of the crowd intake pollutants is obtained. According to the method, a probability statistical method is adopted, the method can be applied to semi-probability or total probability calculation, and uncertainty and variability in the calculation process can be quantitatively counted.

Description

technical field [0001] The invention relates to the field of dietary heavy metal exposure assessment methods, in particular to a dietary heavy metal chronic exposure assessment method based on beta binomial normal distribution. Background technique [0002] Since ancient times, food safety has been a matter of people's livelihood that the country and people have been concerned about. With the development of science and technology in the world, this issue has also attracted the attention of people all over the world. Contamination by food chemicals is a common problem among pollutants. The mining of ores and the use of pesticides and fertilizers will lead to the residue of heavy metals such as lead, cadmium, arsenic, mercury, and copper on food, and eventually enter the body through diet and cause health damage to the human body. Dietary exposure assessment is an important way to conduct more systematic research on the effects of chemical pollutants on the human body. This ...

AI Technical Summary

Problems solved by technology

However, for the long-term exposure assessment of pollutants, the key is to obtain the annual dietary consumption data of the individual population, which is impossible to achieve in the current situation

Usually short-term intermittent (2 working days, 1 rest day) consumption survey data of 72 hours for 3 days is used for long-term exposure assessment of chemical pollutants. The main limitation is the large variability of short-term repeated measurement data. It will lead to greater intrapersonal variation than it actually is, overestimating the evaluation results

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