Chemical hazard safety risk analysis method and device in import and export food

Abstract

The invention discloses a method and a device for analyzing safety risks of chemical hazards in import and export food. The method comprises the following steps: acquiring a detection result set; calculating a limit value ratio of each detection result in the detection result set; screening the detection results of which the limit ratio is greater than 1 and calculating the ratio of the detection results of which the limit ratio is greater than 1 to the total number of the detection results in the detection result set to obtain a risk probability; according to the chemical acute toxicity grading assignment and toxicity classification assignment corresponding to the import and export food, obtaining a potential health hazard score; according to the exposure evaluation result, the probability of occurrence of the health damage is obtained according to the specific value assignment of the target population exposure quantity and the health guidance value and the proportion assignment of the population with the individual exposure quantity exceeding the health guidance value; according to the potential health risk score Hds and the health damage occurrence possibility score, obtaining a health risk score and a grade; and determining a food safety risk score and a grade according to the health risk score and the risk probability. The analysis accuracy can be improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of food safety, and in particular relates to a method and device for analyzing the safety risks of chemical hazards in imported and exported foods. Background Art

[0002] The safety of imported and exported food is an important responsibility of the customs to strictly control the national security, and it is also an important issue related to the national economy and people's livelihood. Conducting risk analysis on food safety helps food consumers understand the hazards of food safety, and provides a theoretical basis for the customs to supervise imported and exported food and formulate and modify food safety supervision measures.

[0003] Chemical hazards are a common hazard in food safety, including pesticide residues, heavy metals, food additives, illegal food additives and other food hazards caused by the environment or human factors. Laboratories can use testing methods to obtain the test results of chemical hazards in food, and compare them with the limit values ​​of food safety standards to assess the extent of the hazard. However, this method is only based on individual hazard assessment and is not representative.

[0004] The "Technical Guidelines for Health Risk Grading of Chemicals in Food" issued by the National Food Safety Risk Assessment Center uses the potential hazard level of chemical hazards and the possibility of health damage to calculate scores, and divides the levels by scores to determine the hazard level of chemicals in food. However, the potential hazard level of this method is based on toxicological indicators, and the possibility of health damage is based on dietary exposure assessment data. The two scores are calculated based on relatively static data, without specific laboratory test results and lack of dynamic updates. Imported and exported foods are highly regional, and the grading of health risks cannot reflect the specificity of chemical hazards in imported and exported foods.

[0005] The patent with application number "CN114444949A" discloses "a food safety risk analysis and early warning method", which calculates the severity of the hazard of the combination of the hazard and the food category to be evaluated according to the toxicological value of the hazard and the dietary intake of the food category to be evaluated, and calculates the probability of hazard occurrence according to the unqualified rate of the hazard content in the food category, and evaluates the food safety risk according to the severity of the hazard and the probability of hazard occurrence. In this method, when the unqualified rate of the hazard is converted into the probability of hazard occurrence, when the unqualified rate is greater than 5%, the uniform conversion value is 5. The converted result cannot truly reflect the safety risk of food with a high unqualified rate, and this method can only analyze the risk level of a single chemical hazard in food. When multiple chemical hazards appear in food, there is a lack of comprehensive analysis methods.

[0006] However, the analysis accuracy of the existing scheme needs to be further improved. Summary of the invention

[0007] In order to solve the problem of poor analysis accuracy of the existing methods, the present invention proposes a method and device for analyzing the safety risk of chemical hazards in imported and exported foods, which can improve the accuracy of the analysis.

[0008] The objective of the present invention is achieved through the following technical solutions:

[0009] The first aspect of the present invention discloses a method for analyzing the safety risk of chemical hazards in imported and exported food, comprising the following steps:

[0010] Acquire a test result set of chemical hazard indicators of an imported or exported food within a period of time, wherein the test result set includes at least one test result;

[0011] Calculate the ratio of each test result in the test result set to the risk threshold to obtain the limit value ratio, where the risk threshold is the limit value specified in the national food safety standard, the safety risk reference value given in the food safety assessment report, or is determined based on the exposure assessment;

[0012] Filter the test results whose limit value ratio is greater than 1 and calculate the ratio of the test results whose limit value ratio is greater than 1 to the total number of test results in the test result set to obtain the risk probability S;

[0013] The potential health hazard score H is obtained based on the acute toxicity classification value Ha and the toxicity classification value Hb of the chemicals corresponding to the imported and exported foods. ds ;

[0014] Using the exposure assessment results, the probability score P of health damage is obtained based on the ratio of the target population exposure to the health guidance value, Pa, and the proportion of the population whose individual exposure exceeds the health guidance value, Pb. ds ;

[0015] According to the potential health risk score H ds and the probability score of health damage occurrence P ds Obtain health risk score HRS and level;

[0016] Determine the food safety risk score FRS and level according to the health risk score HRS and the risk probability S;

[0017] According to the weight of each chemical hazard index W t The comprehensive food safety risk score and level are obtained. The second aspect of the present invention discloses a device for analyzing the safety risk of chemical hazards in imported and exported foods, comprising a memory and a controller that are sequentially connected in communication, the memory storing a computer program, and the controller being used to read the computer program and execute the method for analyzing the safety risk of chemical hazards in imported and exported foods described in the first aspect.

[0018] The beneficial effects of the present invention are:

[0019] 1. The present invention obtains a food safety risk score based on the risk probability determined by the experimental detection data and the health risk score determined based on the existing information, which has high accuracy and strong pertinence.

[0020] 2. The risk probability determined by the present invention based on the experimental detection data is dynamic data, which can reflect the dynamic changes of chemical hazard risks and help customs to adjust the risk supervision measures of imported and exported food in a timely manner. 3. The present invention is not only suitable for the calculation of a single chemical hazard index, but also suitable for the monitoring of exported food with multiple chemical hazard indicators.

[0021] 4. Using limit value ratios to assess the probability of food safety risks can be used to conduct food safety risk analysis for the same food from the same region exported to different countries with different chemical hazard limit requirements. This has the advantages of being comprehensive and integrated. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 Flow chart of the method of the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0028] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use, or the positions or positional relationships commonly understood by those skilled in the art, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] The first aspect of the present invention discloses a method for analyzing the safety risk of chemical hazards in imported and exported food. Figure 1 As shown, it includes step S11 to step S18. It should be noted that the step identifiers in this solution are only for the convenience of explaining the method and do not constitute a limitation on the sequence. The sequence of each step is based on its language description and the sequence of each signal.

[0031] Step S11, obtaining a test result set of chemical hazard indicators of an import and export product within a period of time, wherein the test result set includes at least one test result.

[0032] The test results of multiple chemical hazard indicators can be obtained within a period of time i , and get the detection result set B, B={X1,X2,X3,X4······X n}, n is the total number of valid test results.

[0033] Specifically, the data in the test result set can be processed as follows: calculate the ratio of the number of test results in the test result set that are less than the minimum limit LOD that the test method can quantitatively detect to the total number of test results; if the ratio is less than or equal to 60%, update the test results in the test result set that are less than the minimum limit LOD that the test method can quantitatively detect to 0.5*LOD; if the ratio is greater than 60%, update the test results in the test result set that are less than the minimum limit LOD that the test method can quantitatively detect to 0 and LOD. That is, if A in the test result set B i <The number of LOD is n1, that is, when n1 / n≤60%, X i =0.5*LOD; when n1 / n>60%, X i1 =0,X i2 =LOD.

[0034] In order to facilitate the understanding of the solution method, a specific implementation method is now given as an example for illustration.

[0035] Taking the test results of four pollutants, namely lead, cadmium, arsenic and mercury, i.e. chemical hazard indicators, in exported porcini and their products as an example, 217 valid lead test results, 230 valid cadmium test results, 149 valid arsenic test results and 156 valid mercury test results were obtained within a period of time. The minimum limit LOD of lead, cadmium, arsenic and mercury in the test method is 0.05mg / kg, 0.003mg / kg, 0.005mg / kg and 0.003mg / kg respectively. The undetected results in the test results of cadmium, arsenic and mercury are all less than 60%, and the undetected results are marked as half of the quantitative limit. The undetected results in the lead test results are 60.83%, and the undetected results are assigned 0mg / kg and 0.05mg / kg. The specific monitoring data and key parameter values ​​are shown in Table 1.

[0036] Table 1 Safety risk analysis parameters of boletus contaminants

[0037]

[0038] Step S12, calculate the ratio of each test result in the test result set to the risk threshold to obtain a limit value ratio, where the risk threshold is the limit value specified in the national food safety standard, the safety risk reference value given in the food safety assessment report, or is determined based on exposure assessment.

[0039] Among them, the risk threshold Q can be given according to the limit value specified in the national food safety standards of the corresponding country or in the food safety assessment report. If there is no corresponding empirical parameter, the safety risk reference value can be determined through exposure assessment.

[0040] The limit value ratio of the i-th detection result is calculated according to the following formula: the limit value ratio set E = {C1, C2, C3, C4······C i},

[0041]

[0042] Step S13, screening the test results whose limit value ratio is greater than 1 and calculating the ratio of the test results whose limit value ratio is greater than 1 to the total number of test results in the test result set to obtain the risk probability.

[0043] Specifically, if the limit ratio is greater than 1, it means that the monitoring result exceeds the risk limit. At this time, the set of risk detection results R is R = {C1, C2, C3, C4······C p}, p is the number of test results whose limit ratio C is greater than 1.

[0044] Then the risk probability S is:

[0045]

[0046] When there are multiple chemical hazard indicators in the same export product, the comprehensive risk probability of multiple indicators is calculated based on the following formula, where t represents the total number of chemical hazard indicators in the same export product.

[0047] S 总 =S1+S2+S3+······+S t ;

[0048] The risk weight of a single chemical hazard indicator in the same export product is calculated according to the following formula:

[0049]

[0050] In order to facilitate the monitoring of the product status of export products, at this time, the interval of 0 to 1 can also be divided into multiple intervals according to the interval width H of equal width, and the limit ratio set contained in each interval is G H ={C1,C2,C3,C4······C m}, m is the number of test results in the corresponding interval segment; then calculate the ratio of the total number of test results in each interval segment to the total number of test results in the test result set to obtain the interval probability, where the interval probability Y is:

[0051]

[0052] Finally, the interval probability distribution diagram is drawn with the limit ratio as the horizontal axis and the interval probability as the vertical axis.

[0053] Step S14: derive the potential health hazard score H according to the chemical acute toxicity classification value Ha and toxicity classification value Hb corresponding to the export product.ds .

[0054] The potential health hazard score is determined based on the acute toxicity grade assignment Ha and the toxicity classification assignment Hb.

[0055] Ha classification is assigned by searching the oral LD50 of chemicals 50 Based on the acute toxicology data, the acute toxicity classification of chemicals is determined according to the "Acute Oral Toxicity Test GB 15193.3" (Draft for Comments) standard of my country, and the effect index Ha is assigned a value, see Table 2.

[0056] Table 2 Acute toxicity rating table

[0057]

[0058] Retrieve data on carcinogenicity, mutagenicity, reproductive / developmental toxicity, neurotoxicity, and subchronic and chronic toxicity of chemicals, and refer to the classification standards of the International Agency for Research on Cancer (IARC) carcinogens, the European Union (EU) mutagenicity, the EU reproductive toxicity (including developmental toxicity) classification, the U.S. Environmental Protection Agency (EPA) neurotoxicity, and the World Health Organization (WHO) Globally Harmonized System of Classification and Labelling of Chemicals (GHS) to determine the classification and value assignment of the Hb index of chemicals, see Table 3-7.

[0059] Generally, chemicals in food may have multiple toxicities at the same time, and the highest level of toxicity among all toxicities should be selected based on the principle of conservatism to assign Hb values. For substances with uncertain health effects or unclassified substances, Hb is assigned a value of 1.

[0060] Table 3 Carcinogen classification table

[0061]

[0062] Table 4 Mutagenicity Grading Table

[0063]

[0064]

[0065] Table 5 Reproductive / developmental toxicity classification assignment table

[0066]

[0067] Table 6 Neurotoxicity grading table

[0068]

[0069] Table 7 Subchronic / chronic toxicity classification assignment table

[0070]

[0071] Based on the scores or levels of Ha and Hb, the potential health hazard score H is calculated using the weighted average method. ds , the weight coefficients of Ha and Hb are preferably both 0.5, and the weight values ​​can be adjusted appropriately in special cases. When the weight coefficients of Ha and Hb are both 0.5, the calculation formula is as follows. When the score is a fraction, the result is rounded up.

[0072]

[0073] The grade scores are 1-5, and the corresponding potential health damage levels are "Ⅰ", "Ⅱ", "Ⅲ", "Ⅳ" and "V" respectively.

[0074] Taking the example in step S11, the rat oral LD ​​of each pollutant is retrieved 50 Toxicological data, including the oral LD50 of lead in rats 50 The value of Ha is 3, which is 125 mg / kg. Lead is a Class 2B carcinogen, and its value of Hb is 3. The value of H for potential health damage is calculated to be 3, which is Grade III. 50 The value of Hb is 4. The value of Hb is 3, which is the level of III. The oral LD50 of arsenic in rats is 2330 mg / kg, and the value of Ha is 2. Cadmium is a chronic or cumulative poison, and it belongs to the subchronic / chronic toxicity category 1 according to Table 6, and the value of Hb is 4. The potential health damage grade score H is calculated to be 3, and the grade is level III. 50 The H value is 763 mg / kg, and the Ha value is 2. Arsenic is a Class 1 carcinogen, and the Hb value is 5. The potential health damage grade H is calculated to be 4, and the grade is IV. Among the various forms of mercury, methylmercury is the most harmful, and its oral LD50 in rats is 1. 50 It is 25 mg / kg, and Ha is assigned a value of 4; mercury is a cumulative toxin, and according to Table 6, it belongs to the first category of subchronic / chronic toxicity, and Hb is assigned a value of 4; the potential health damage level score H is calculated to be 4, and the level is IV.

[0075] Step S15, determine the ratio of the target population exposure to the health guidance value Pa according to the ratio of the target population exposure to the health guidance value, and determine the proportion of the population whose individual exposure exceeds the health guidance value Pb according to the proportion of the population whose individual exposure exceeds the health guidance value.

[0076] Among them, the Pa grading assignment uses the exposure assessment results to assign a value to the indicator Pa based on the ratio of the target population's exposure to the health guidance value. See Table 8 for details.

[0077] Table 8 Ratio of exposure to target population and health guidance value

[0078]

[0079] When evaluating the chronic toxicity of chemicals, the average exposure is used to describe the exposure of the entire population or age group, and the high-end exposure is used to describe the exposure of the high-end consumer group; when evaluating the acute toxicity of chemicals, the extreme exposure is used to describe the exposure of the target population.

[0080] Using the exposure assessment results, the indicator Pb is assigned a value based on the proportion of the population whose individual exposure exceeds the health guidance value, see Table 9.

[0081] Table 9 Grading and assignment of proportion of population whose individual exposure exceeds health guidance value

[0082]

[0083] Step S16: Determine the probability score of health damage occurrence based on Pa and Pb.

[0084] Based on the indicators Pa and Pb, the weighted average method is used to calculate the probability score of health damage. The weight coefficients of Pa and Pb are preferably both 0.5, and the weight values ​​can be adjusted appropriately in special cases. When the weight coefficients of Pa and Pb are both 0.5, the probability score of health damage P ds The calculation formula is as follows: When the score is a fraction, the result is rounded up.

[0085]

[0086] The grade scores range from 1 to 5, and the corresponding levels of likelihood of health damage are “Ⅰ”, “Ⅱ”, “Ⅲ”, “Ⅳ” and “Ⅴ” respectively.

[0087] In the case of lack of data, such as emergency risk assessment, it may not be possible to obtain the proportion of the population whose individual exposure exceeds the health guidance value, and it is impossible to assign a value to Pb. In this case, the weight coefficient can be adjusted, that is, the weight coefficient of Pb is 0, and the weight coefficient of Pa is 1. The possibility of health damage is determined based on the ratio of the target population exposure to the health guidance value Pa.

[0088] For example, according to the results of the Preliminary Risk Assessment of Dietary Cadmium Exposure of Chinese Residents (No. 2011-001), the average dietary cadmium intake of the entire population is 20.3 μg / kg bw per month, accounting for 81.2% of the PTMI (25 μg / kg bw), and Pa is assigned a value of 4; the dietary lead exposure of the entire population is 33 μg / kg bw per month, accounting for 33% of the PTMI (100 μg / kg bw), and Pa is assigned a value of 2; the arsenic exposure of the entire population is about 15 μg / kg bw per month, accounting for 25% of the PTMI (60 μg / kg bw), and Pa is assigned a value of 2; the mercury exposure of the entire population is 0.444 μg / kg bw per week, accounting for 11.6% of the PTWI (4 μg / kg bw), and Pa is assigned a value of 2; due to the lack of data on the proportion of the population whose individual exposure exceeds the health guidance value, the weights of Pa and Pb are adjusted to 1 and 0, respectively, so that the health damage occurrence possibility score P=Pa.

[0089] Step S17: Calculate the health risk level according to the probability score of the health damage and the potential health hazard score.

[0090] The health risk level HRS is determined using the risk matrix method.

[0091] The risk matrix is ​​a two-dimensional matrix model that arranges and displays risks by determining the scope of consequences and possibilities, and can intuitively display the distribution of food risks. The horizontal axis represents the degree or level (score) of potential health damage, and the vertical axis represents the level of possibility of health damage. The intersection of the two parameters on the model corresponds to the health risk score. The score can also be calculated according to the following formula:

[0092] HRS=H ds ×P ds .

[0093] The health risk score is a dimensionless value that quantitatively describes the risk of health damage caused by a certain hazard factor in food. The health risks of chemicals can be divided into three levels: low, medium and high based on the health risk score. The rules for dividing health risks at different levels refer to the risk score and risk matrix.

[0094] Table 10 Health risk level table

[0095]

[0096] Table 11 Risk Matrix

[0097]

[0098]

[0099] High risk means that the hazard in food poses a high risk of health damage to the population, and risk management measures need to be taken immediately. Medium risk means that a certain hazard in food poses a moderate risk of health damage to the population, and certain risk management measures need to be taken. Low risk means that a certain hazard in food poses a low risk of health damage to a certain population. Routine procedure management, no other risk management measures are required.

[0100] Taking the example in step S11, the health risk score of each pollutant is calculated with reference to the risk matrix, and the health risk level is determined. The results are shown in Table 12.

[0101] Table 12 Boletus health risk analysis and classification

[0102]

[0103] Step S18: Determine a food safety risk score based on the health risk score and the risk probability P.

[0104] Based on the health risk score and the food safety risk probability analysis, the food safety risk score is calculated. The calculation is shown as follows:

[0105] FRS = HRS x (1 + S).

[0106] If the product involves the detection of multiple chemical hazard indicators, the weight W of each chemical hazard indicator shall be used. t The comprehensive food safety risk score and level are obtained, that is, the food safety risk score is calculated according to the following formula:

[0107] FRS 总 =∑(FRS t ×W t ).

[0108] Based on the food safety risk score, determine the food safety risk level according to Table 13.

[0109] Table 13 Food safety risk level table

[0110]

[0111] For example, the food safety risk score is calculated and the food safety risk level is divided according to the risk probability calculation results of each pollutant in Table 12 of porcini and its products and the health risk level calculation results of each pollutant in Table 13. The food safety risk level of each pollutant lead, cadmium, arsenic and mercury in porcini and its products is medium risk, and the comprehensive risk level is also medium risk.

[0112] Table 14 Boletus safety risk analysis and classification

[0113] Table 17:Monitoring results and parameters of Boletus edulis

[0114]

[0115] The use of the above method is conducive to the effective supervision and regulation of imported and exported foods, which ensures the specificity of individual chemical hazards in food and conducts a comprehensive analysis of multiple chemical hazards, and can more comprehensively reflect the risk situation of chemical hazards in imported and exported foods.

[0116] The second aspect of the present invention discloses a device for analyzing the safety risk of chemical hazards in exported food, including a memory and a controller that are sequentially connected in communication, the memory storing a computer program, the controller being used to read the computer program and execute the method for analyzing the safety risk of chemical hazards in exported food described in the first aspect. Specifically, the memory may include, but is not limited to, a random access memory (RAM), a read-only memory (ROM), a flash memory, a first-in-first-out memory (FIFO) and or a first-in-last-out memory (FILO), etc.; the controller may not be limited to a microcontroller of the STM32F105 series. In addition, the computer device may also include, but is not limited to, a power supply unit, a display screen and other necessary components.

[0117] Specifically, the operating principle of the device provided in the second aspect is detailed in the first aspect and will not be repeated here.

[0118] Those skilled in the art will appreciate that the embodiments described herein are intended to help readers understand the principles of the present invention, and should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific variations and combinations that do not deviate from the essence of the present invention based on the technical revelations disclosed by the present invention, and these variations and combinations are still within the protection scope of the present invention.

Claims

1. A method for analyzing the safety risk of chemical hazards in imported and exported food, characterized in that: The following steps are involved: Acquire a test result set of chemical hazard indicators of an imported or exported food within a period of time, wherein the test result set includes at least one test result; Calculate the ratio of each test result in the test result set to the risk threshold to obtain the limit value ratio, where the risk threshold is the limit value specified in the national food safety standard, the safety risk reference value given in the food safety assessment report, or is determined based on the exposure assessment; Filter the test results whose limit value ratio is greater than 1 and calculate the ratio of the test results whose limit value ratio is greater than 1 to the total number of test results in the test result set to obtain the risk probability S; The potential health hazard score H is obtained based on the acute toxicity classification value Ha and the toxicity classification value Hb of the chemicals corresponding to the imported and exported foods. ds ; Using the exposure assessment results, the probability score P of health damage is obtained based on the ratio of the target population exposure to the health guidance value, Pa, and the proportion of the population whose individual exposure exceeds the health guidance value, Pb. ds ; According to the potential health risk score H ds and the probability score of health damage occurrence P ds Obtain health risk score HRS and level; Determine the food safety risk score FRS and level according to the health risk score HRS and the risk probability S; According to the weight of each chemical hazard index W t Obtain comprehensive food safety risk scores and levels.

2. The method for analyzing the safety risk of chemical hazards in imported and exported food according to claim 1, characterized in that: The method of obtaining a test result set of chemical hazard indicators of an imported or exported food within a period of time further includes: Calculate the ratio of the number of test results in the test result set that are less than the lowest limit LOD that can be quantitatively detected by the detection method to the total number of test results; If the ratio is less than or equal to 60%, the test results that are less than the minimum limit LOD that the test method can quantitatively detect are updated to 0.5*LOD; If the ratio is greater than 60%, the test results that are less than the minimum limit LOD that the detection method can quantitatively detect are updated to 0 and LOD.

3. The method for analyzing the safety risk of chemical hazards in imported and exported food according to claim 1, characterized in that: Calculate the ratio of each test result in the test result set to the risk threshold to obtain the limit ratio, followed by: The interval of 0 to 1 is divided into multiple interval segments according to the interval width of equal width, and the interval below the LOD and the interval whose limit ratio is greater than 1 form a complete interval segment, and the interval width is determined according to the corresponding confidence level; the ratio of the total number of test results in each interval segment to the total number of test results in the test result set is calculated to obtain the interval probability; With the limit ratio as the horizontal axis and the interval probability as the vertical axis, a probability distribution diagram of the generated interval is drawn.

4. The method for analyzing the safety risk of chemical hazards in imported and exported food according to claim 1, characterized in that: The potential health hazard score H is obtained based on the acute toxicity classification value Ha and the toxicity classification value Hb corresponding to the imported and exported food ds ,include: The acute toxicity classification value Ha and the toxicity classification value Hb are calculated using the weighted average method to obtain the potential health hazard score H ds and the corresponding levels.

5. The method for analyzing the safety risk of chemical hazards in imported and exported food according to claim 1, characterized in that: Determining the health risk level score based on Pa and Pb includes: The health risk grade P is calculated by weighted average method based on the ratio of target population exposure to health guidance value Pa and the proportion of population whose individual exposure exceeds health guidance value Pb. ds and the corresponding levels.

6. The method for analyzing the safety risk of chemical hazards in imported and exported food according to claim 1, characterized in that: The health risk level is calculated based on the probability score of health damage and the potential health hazard score, including: The health risk level is calculated by using the risk matrix method for the probability score of the health damage and the potential health hazard score.

7. The method for analyzing the safety risk of chemical hazards in imported and exported food according to claim 1, characterized in that: The weight W of each chemical hazard t Obtain comprehensive food safety risk scores and levels, including: When there are multiple chemical hazards in the same food, the total risk probability of the food is the sum of the risk probabilities of each individual chemical hazard, and the risk weight of a single chemical hazard in the same food is the ratio of the risk probability of that hazard to the total risk probability.

8. A device for analyzing the safety risk of chemical hazards in imported and exported food, comprising a memory and a controller that are sequentially connected in communication, wherein a computer program is stored in the memory, characterized in that: The controller is used to read the computer program and execute the method for analyzing the safety risks of chemical hazards in exported food described in the first aspect.

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