A method for evaluating the restoration effect of construction land based on health risks

Abstract

The present invention discloses a method for evaluating the effect of construction land restoration based on health risks, which includes: step s1: taking heavy metal contaminated soil and determining the amount of heavy metal elements in the contaminated soil; step s2: analyzing the morphological composition of heavy metals in the soil; step s3: calculating the content of heavy metals in the contaminated soil entering the human body through different pathways every day; step s4: comparing the amount of a single heavy metal acid-soluble state entering the human body before restoration with the human body's daily tolerance value for a single metal, and making corresponding judgments; step s5: taking the restored soil and analyzing the morphological composition of heavy metals in the soil; step s6: calculating and judging whether the restoration target is achieved. The present invention introduces a single heavy metal daily tolerance value for the human body, abandons carcinogenic and non-carcinogenic factors, makes the evaluation process more convenient, and makes the evaluation results more intuitive.

Description

Technical Field

[0001] The present invention relates to the technical field of evaluating the treatment of heavy metal pollution in soil of construction land, and in particular to a method for evaluating the restoration effect of construction land based on health risks. Background Art

[0002] my country's construction land pollution control work started relatively late, and there is a lack of experience and relevant evaluation methods for evaluating the effect of heavy metal pollution control in construction land soil. At present, the safety of construction land is generally based on the "control value" in the "Standards for Risk Control of Soil Pollution in Construction Land", and the control of individual heavy metals is implemented to specific values. In fact, although the heavy metal content in some construction land exceeds the "control value", its heavy metal form is stable and will not affect the human body; on the contrary, the heavy metal content in some construction land is lower than the "control value", but the acid-soluble state is high, which will still affect human health. Among the commonly used soil remediation technologies, solidification / stabilization technology stands out with its advantages of rapidity, high efficiency, economy, and wide application range, and has become the most important remediation technology for heavy metal contaminated land in my country. However, solidification / stabilization technology only converts heavy metal pollutants in the soil into other forms, which exist more stably in the soil, and does not change the content of heavy metals in the soil. Therefore, for these two situations, using the "control value" of construction land as a standard can neither determine whether the soil should be repaired nor whether the soil after solidification / stabilization repair is safe. In the evaluation of construction land restoration, the toxic leaching reduction rate is often used to judge the restoration effect, but it is not linked to human health and cannot reflect whether the restored land will threaten the surrounding residents. Therefore, it is particularly important to use human health as the evaluation standard.

[0003] my country mainly uses the "Technical Guidelines for Risk Assessment of Soil Pollution in Construction Land (HJ 25.3--2019)" as a human health risk assessment method for heavy metal contaminated soil. This assessment method mainly calculates the potential health risks of contaminated soil based on the carcinogenic and non-carcinogenic effects of heavy metal pollutants after exposure to various exposure pathways. The harm of heavy metals to the human body mainly depends on the bioavailability, that is, the amount of acid-soluble state. This method does not consider the harm of heavy metal forms in the soil to the human body during calculation, that is, whether the soil needs to be repaired; CN112285320.A makes improvements on the former, by constructing a functional relationship between heavy metal leaching concentration, acid-soluble state concentration and pH, to achieve a dynamic assessment of the human risk of heavy metal contaminated soil remediation and reuse under different pH environmental conditions. It takes into account the decisive role of the acid-soluble state on human health during calculation and applies it. However, it does not make a judgment on whether the soil before restoration needs restoration; and relatively speaking, when carcinogenic and non-carcinogenic effects are used as the medium, the calculation is cumbersome, the process is complicated, and the results are presented in the form of hazard index, which cannot intuitively reflect the threat level of the restored soil to human health. Therefore, it is urgent to develop a human health risk assessment method for the restoration of construction land that can quickly determine whether the construction land needs restoration and does not use carcinogenic and non-carcinogenic effects as the medium, making the process more convenient and the results more intuitive. Summary of the invention

[0004] The present invention provides a method for evaluating the effect of construction land restoration based on health risks. One of the technical problems it aims to solve is that when the existing technology uses carcinogenic and non-carcinogenic effects as media, the calculation is cumbersome, the process is complicated, and the results are presented in the form of a hazard index, which cannot intuitively reflect the degree of threat to human health posed by the restored soil.

[0005] In view of the above problems in the prior art, according to one aspect disclosed in the present invention, the present invention adopts the following technical solution:

[0006] A method for evaluating the restoration effect of construction land based on health risks, comprising:

[0007] Step s1: taking heavy metal contaminated soil and determining the amount of heavy metal elements in the contaminated soil;

[0008] Step s2: Analyze the morphological composition of heavy metals in the soil;

[0009] Step s3: Calculate the content of heavy metals in the contaminated soil that enter the human body through different pathways every day;

[0010] Step s4: Compare the amount of acid-soluble heavy metal that enters the human body before remediation with the daily tolerance value of the human body to the single metal to determine whether it exceeds the human body's tolerance range; if it exceeds the human body's tolerance range, remediate it; otherwise, it is safe soil and no remediation measures are required;

[0011] Step s5: taking the repaired soil and analyzing the form composition of heavy metals in the soil;

[0012] Step s6: Calculate the amount of single heavy metal acid-soluble state entering the human body after repair, and compare it with the human body's daily tolerance value for the single metal to determine whether it is lower than the human body's tolerance range. If it is lower, the repair effect is up to standard, otherwise it is unsafe and other means of repair are required.

[0013] In order to better realize the present invention, a further technical solution is:

[0014] Furthermore, in step s1, heavy metal contaminated soil is sampled by a five-point sampling method.

[0015] Furthermore, in the step s1, the heavy metal contaminated soil obtained by the five-point sampling method is mixed evenly and then the amount of heavy metal elements in the contaminated soil is determined by XRF.

[0016] Furthermore, in step s2, the morphological composition of heavy metals in the soil is analyzed using the BCR sequential extraction method.

[0017] Furthermore, in step s3, the amount of a single heavy metal entering the human body through skin contact is included, in mg:

[0018] W1=SAE×SSAR×ABS d ×ASS×10 -6 ;

[0019] SAE = 239 × H 0.417 ×BW 0.517 ×SER;

[0020] Where:

[0021] SAE is the exposed skin surface area of ​​the human body, in cm 2 ;

[0022] SSAR is the human skin surface adhesion coefficient, unit: mg / cm 2 ;

[0023] ABS d is the skin contact absorption efficiency factor, dimensionless;

[0024] ASS is the amount of acid-soluble heavy metals in the soil, in mg / kg;

[0025] H is the average height of the population, in cm;

[0026] BW is the average body weight of the population, in kg.

[0027] Furthermore, in step s3, the amount of a single heavy metal entering the human body through breathing every day is included, in mg:

[0028] W2=PM 10 ×DAIR×PIFA×(fspi×EFI+fspo×EFO)×ASS×10 -6 ;

[0029] Where:

[0030] PM 10 is the content of inhalable suspended particulate matter in the air, mg / m 3 ;

[0031] DAIR is the daily air breathing volume of the human body, m 3 / d;

[0032] PIFA is the proportion of inhaled soil particles retained in the body, dimensionless;

[0033] fspi is the proportion of soil particles in indoor air, dimensionless;

[0034] fspo is the proportion of soil particles in outdoor air, dimensionless;

[0035] EFI is the human exposure frequency indoors, in d;

[0036] EFO is the human body's exposure frequency outdoors, in d.

[0037] Furthermore, in step s3, the amount of a single heavy metal entering the human body through the oral cavity per day is included, in mg;

[0038] W3=OSIR×ABSo×ASS×10 -6 ;

[0039] Where:

[0040] OSIR is the daily soil intake of humans, mg;

[0041] ABSo is the absorption efficiency factor for oral intake, dimensionless;

[0042] The amount of a single heavy metal acid that enters the human body in soluble form is W1+W2+W3.

[0043] Furthermore, in step s5, the morphological composition of heavy metals in the soil is analyzed using an improved BCR sequential extraction method.

[0044] Compared with the prior art, one of the beneficial effects of the present invention is:

[0045] The health risk-based construction land restoration effect evaluation method of the present invention can be used to compare the safety of soil after restoration by various solidification / stabilization methods, and provide guidance for the evaluation of the solidification / stabilization restoration effect of construction land; by determining the amount of acid-soluble heavy metals that enter the human body in the construction land before and after restoration, and comparing it with the daily tolerance value of the human body to a single metal, it is judged whether the land needs to be restored, and the restoration effect evaluation is made, thereby improving the scientificity, accuracy and effectiveness of the solidification / stabilization restoration effect of contaminated soil on construction land, and providing decision-making support for the pollution prevention and control restoration effect of construction land; compared with the prior art, it introduces the daily tolerance value of a single heavy metal by the human body, and abandons carcinogenic and non-carcinogenic factors, making the evaluation process more convenient and the evaluation results more intuitive, providing a new idea for the evaluation benchmark of the construction land restoration effect. DETAILED DESCRIPTION

[0046] The present invention is further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto.

[0047] A method for evaluating the restoration effect of construction land based on health risks, comprising:

[0048] Step s1: Take heavy metal contaminated soil and determine the amount of heavy metal elements in the contaminated soil.

[0049] Among them, it is preferred to sample the heavy metal contaminated soil by a five-point sampling method, and it is preferred to evenly mix the heavy metal contaminated soil sampled by the five-point sampling method and then use XRF to determine the amount of heavy metal elements in the contaminated soil.

[0050] Step s2: Analyze the morphological composition of heavy metals in the soil.

[0051] Among them, in this step, the BCR sequential extraction method can be preferably used to analyze the morphological composition of heavy metals in the soil.

[0052] Step s3: Calculate the amount of heavy metals in the contaminated soil that enter the human body through different pathways every day, referring to the Technical Guidelines for Risk Assessment of Soil Pollution in Construction Land (HJ 25.3-2019);

[0053] This step s3 includes:

[0054] 1) The amount of a single heavy metal that enters the human body through skin contact, in mg:

[0055] W1=SAE×SSAR×ABS d ×ASS×10 -6 ;

[0056] SAE = 239 × H 0.417 ×BW 0.517 ×SER;

[0057] Where:

[0058] SAE is the exposed skin surface area of ​​the human body, in cm 2 ;

[0059] SSAR is the human skin surface adhesion coefficient, unit: mg / cm 2 ;

[0060] ABS d is the skin contact absorption efficiency factor, dimensionless;

[0061] ASS is the amount of acid-soluble heavy metals in the soil, in mg / kg;

[0062] H is the average height of the population, in cm;

[0063] BW is the average body weight of the population, in kg.

[0064] 2) The amount of a single heavy metal that enters the human body through breathing every day, in mg:

[0065] W2=PM 10 ×DAIR×PIFA×(fspi×EFI+fspo×EFO)×ASS×10 -6 ;

[0066] Where:

[0067] PM 10 is the content of inhalable suspended particulate matter in the air, mg / m 3 ;

[0068] DAIR is the daily air breathing volume of the human body, m 3 / d;

[0069] PIFA is the proportion of inhaled soil particles retained in the body, dimensionless;

[0070] fspi is the proportion of soil particles in indoor air, dimensionless;

[0071] fspo is the proportion of soil particles in outdoor air, dimensionless;

[0072] EFI is the human exposure frequency indoors, in d;

[0073] EFO is the human body's exposure frequency outdoors, in d.

[0074] 3) The amount of a single heavy metal that enters the human body through the oral cavity every day, in mg;

[0075] W3=OSIR×ABSo×ASS×10 -6 ;

[0076] Where:

[0077] OSIR is the daily soil intake of humans, mg;

[0078] ABSo is the absorption efficiency factor for oral intake, dimensionless;

[0079] The amount of a single heavy metal acid that enters the human body in soluble form is W1+W2+W3.

[0080] Step s4: Compare the amount of acid-soluble heavy metal that enters the human body before remediation with the daily tolerance value of the human body to the single metal to determine whether it exceeds the human body's tolerance range; if it exceeds the human body's tolerance range, remediate it; otherwise, it is safe soil and no remediation measures are required;

[0081] Step s5: taking the repaired soil and analyzing the form composition of heavy metals in the soil;

[0082] Among them, in this step, the soil after solidification, stabilization and repair can be taken, and the improved BCR sequential extraction method is preferably used to analyze the morphological composition of heavy metals in the soil.

[0083] Step s6: Calculate the amount of single heavy metal acid-soluble state entering the human body after repair, referring to the method of W1+W2+W3 in the above embodiment, and compare it with the daily tolerance value of the human body to the single metal to determine whether it is lower than the human body tolerance range. If it is lower, the repair effect is up to standard, otherwise it is unsafe and other means of repair are required.

[0084] The following table shows the safe daily intake values ​​(tolerance values) of common heavy metal elements in construction land:

[0085] element Pb Ni Cd Cu Cr(6+) Maximum intake 78ug 600ug 50ug 2000ug 150ug

[0086] The following table shows the recommended values ​​for the first and second types of land use:

[0087]

[0088]

[0089] Example 1

[0090] Soil was obtained near a nonferrous metal smelting slag field in Sichuan, and its main chemical composition was determined by XRF. Taking Pb, Ni and Cd as examples, the contents of the three metals in the soil sample are shown in the table, which far exceed the heavy metal control values ​​of the second category of construction land. The acid-soluble contents of Pb, Ni and Cd were measured by BCR continuous extraction method, which were 11.2%, 10.6% and 17.6%, respectively, i.e. 412.16 mg / kg, 340.26 mg / kg and 62.48 mg / kg.

[0091] Table of Pb, Ni and Cd metal contents:

[0092] element Pb Ni Cd Content (mg / kg) 3680 3210 355

[0093] Evaluate the health risks of soil before restoration:

[0094] The amount of a single heavy metal pollutant that enters the human body through the skin every day:

[0095] W1=SAE×SSAR×ABS d ×ASS×10 -6

[0096] By SAE = 239 × H 0.417 ×BW 0.517 ×SER

[0097] SAE = 239 × 8.41 × 8.66 × 0.18 = 3130.67 cm 2

[0098] W1=3130.67×0.2×ABS d =626.13×ABS d ×ASS×10 -6

[0099] ABS corresponding to three metals: Pb, Ni and Cd d value:

[0100]

[0101]

[0102] Therefore, the amount of Pb, Ni and Cd that enter the human body through the skin every day are: 1.55ug, 0ug and 0.391ug respectively.

[0103] The amount of a single heavy metal entering the human body through breathing every day:

[0104] W2=PM 10 ×DAIR×PIFA×(fspi×EFI+fspo×EFO)×ASS×10 -6

[0105] W2=0.119×14.5×0.75×(0.8×0.5+0.5×0.17)×ASS×10 -6

[0106] The amount of Pb, Ni and Cd entering the human body through breathing are: 2.74ug, 2.26ug and 0.41ug respectively. The amount of a single heavy metal ingested by the human body through the mouth every day:

[0107] W3=OSIR×ABSo×ASS×10 -6

[0108] The amounts of Pb, Ni and Cd entering the human body through the oral cavity are 412.16ug, 340.26ug and 62.48ug respectively.

[0109] Therefore, the total amount of acid-soluble Pb, Ni and Cd entering the human body every day is calculated to be 416.5ug, 342.26ug and 63.281ug.

[0110] Comparing the daily tolerance values ​​of Pb, Ni and Cd entering the human body of 78ug, 600ug and 50ug, it can be seen that the intake of Pb far exceeds the safety level, posing a huge threat to human health. The amount of Cd entering the human body also exceeds the maximum daily tolerance of the human body. Long-term accumulation will have an impact on human health. The Ni element is lower than the daily tolerance value of the human body and will not have an impact on the human body. It is therefore evaluated at the "control value" of construction land.

[0111] After the soil was repaired, the repaired soil samples were taken out using the five-point sampling method, and then the acid-soluble states of Pb, Ni and Cd were measured using the above-mentioned BCR continuous extraction method, which were reduced by 98.37%, 92.66% and 88.43%, i.e. 6.72 mg / kg, 24.23 mg / kg and 7.23 mg / kg, respectively.

[0112] The amounts of Pb, Ni and Cd entering the human body through breathing are 0.045ug, 0.166ug and 0.047ug respectively.

[0113] The amounts of Pb, Ni and Cd entering the human body through the mouth are 6.718ug, 24.975ug and 7.230ug respectively.

[0114] Therefore, the amount of Pb, Ni and Cd that enter the human body through the skin every day is: 0.025ug, 0ug and 0.037ug respectively.

[0115] Therefore, the total amount of Pb, Ni and Cd entering the human body every day is 6.788ug, 25.141ug and 7.314ug respectively.

[0116] From this, it can be judged that the Pb and Cd elements in the repaired soil will not affect human health and meet the repair standards.

[0117] The calculated bioavailability of heavy metals Pb, Ni and Cd after restoration (i.e., acid-soluble) were 59.98 mg / kg, 235.61 mg / kg and 44.62 mg / kg, respectively; the acid-soluble content of Pb was lower than the screening value of 800 mg / kg for Class II land, and the acid-soluble content of Cd was lower than the screening value of 65 mg / kg for Class II land.

[0118] Example 2

[0119] Construction land (second category) around a nickel mine in Huili, Sichuan was taken and mixed evenly. The nickel content in the soil was measured to be 6680 mg / kg. The acid-soluble Ni content was measured by the BCR sequential extraction method to be 21.7%, or 1149.56 mg / kg.

[0120] Evaluate the health risks of soil before restoration:

[0121] The amount of a single heavy metal pollutant that enters the human body through the skin every day:

[0122] W1=3130.67×0.2×ABS d ×ASS×10 -6 =626.13×ABS d ×ASS×10 -6 =0

[0123] The amount of a single heavy metal entering the human body through breathing every day:

[0124] W2=PM 10 ×DAIR×PIFA×(fspi×EFI+fspo×EFO)×ASS×10 -6

[0125] W2=0.119×14.5×0.75×(0.8×0.5+0.5×0.17)×ASS×10 -6 =7.22ug

[0126] Daily oral intake of a single heavy metal:

[0127] W3=OSIR×ABSo×ASS×10 -6

[0128] W3=100×1×1149.56×10 -6 =1149.56ug

[0129] The amount of Ni pollution entering the human body every day before repair is: W1+W2+W3=0+7.22+1149.56=1156.78ug

[0130] Compared with the maximum daily tolerance of nickel of 600ug for the human body, it can be seen that the Ni element in the soil of this construction land is unsafe and threatens human health.

[0131] After solidification / stabilization repair, the acid-soluble Ni content was measured by BCR sequential extraction method and decreased by 81.5%, i.e. 212.67 mg / kg.

[0132] Evaluating the health risks of remediated soils

[0133] The amount of a single heavy metal pollutant that enters the human body through the skin every day:

[0134] W1=3130.67×0.2×ABS d ×ASS×10 -6 =626.13×ABS d ×212.67×10 -6 =0

[0135] The amount of a single heavy metal entering the human body through breathing every day:

[0136] W2=PM 10 ×DAIR×PIFA×(fspi×EFI+fspo×EFO)×ASS×10 -6

[0137] W2=0.119×14.5×0.75×(0.8×0.5+0.5×0.17)×212.67×10 -6 =1.34ug

[0138] Daily oral intake of a single heavy metal:

[0139] W3=OSIR×ABSo×ASS×10 -6

[0140] W3=100×1×212.67×10 -6 =212.67ug

[0141] After repair, the amount of Ni pollution entering the human body every day is: W1+W2+W3=0+1.34+212.67=214.01ug

[0142] Compared with the maximum daily tolerance of nickel of 600ug for the human body, it can be seen that the Ni element in the repaired construction land is safe and will not threaten human health.

[0143] The acid-soluble content of Ni element after restoration is 212.67 mg / kg, which is lower than the screening value and control value of the second type of construction land.

[0144] Example 3

[0145] Soil from construction land (Type II) around a copper mine in Sichuan Province was obtained, and after evenly mixing, the Cu content in the soil was measured to be 8720 mg / kg. The acid-soluble state of Cu was measured by the BCR sequential extraction method to be 41.2%, i.e. 3592.64 mg / kg.

[0146] Evaluate the health risks of soil before restoration:

[0147] The amount of a single heavy metal pollutant that enters the human body through the skin every day:

[0148] W1=3130.67×0.2×ABS d ×ASS×10 -6 =626.13×ABS d ×3592.64×10 -6 =0

[0149] The amount of a single heavy metal entering the human body through breathing every day:

[0150] W2=PM 10 ×DAIR×PIFA×(fspi×EFI+fspo×EFO)×ASS×10 -6

[0151] W2=0.119×14.5×0.75×(0.8×0.5+0.5×0.17)×3592.64× 10 -6 =22.55ug

[0152] Daily oral intake of a single heavy metal:

[0153] W3=OSIR×ABSo×ASS×10 -6

[0154] W3=100×1×3592.64×10 -6 =3592.64ug

[0155] The amount of Cu pollution that enters the human body every day before repair is: W1+W2+W3=0+22.55+3592.64=3615.19ug

[0156] This is far greater than the human body's daily tolerance value of Cu, which is 2000ug, so the Cu element in it needs to be repaired.

[0157] After solidification / stabilization repair, the mixed soil was taken and the BCR sequential extraction method was used to measure the acid soluble state after repair, which was reduced by 72.36%, that is, 993.00 mg / kg.

[0158] Evaluating the health risks of remediated soils

[0159] The amount of a single heavy metal pollutant that enters the human body through the skin every day:

[0160] W1=3130.67×0.2×ABS d ×ASS×10 -6 =626.13×ABS d ×993×10 -6=0

[0161] The amount of a single heavy metal entering the human body through breathing every day:

[0162] W2=PM 10 ×DAIR×PIFA×(fspi×EFI+fspo×EFO)×ASS×10 -6

[0163] W2=0.119×14.5×0.75×(0.8×0.5+0.5×0.17)×993×10 -6 =6.26ug

[0164] Daily oral intake of a single heavy metal:

[0165] W3=OSIR×ABSo×ASS×10 -6

[0166] W3=100×1×993×10 -6 =993ug

[0167] After repair, the amount of Cu pollution entering the human body every day is: W1+W2+W3=0+6.26+993=999.26ug

[0168] This is lower than the human body's daily tolerance value of Cu, which is 2000ug, so it can be seen that the repair effect has reached the standard.

[0169] In summary, the evaluation method of the heavy metal pollution remediation effect of construction land soil of the present invention specifically involves the evaluation of the heavy metal content of the remediated soil on the health of the surrounding people. Compared with the previous technology, this method is more convenient and intuitive. It does not use carcinogenic and non-carcinogenic risks as the basis for judgment, but converts them into the daily maximum tolerance value of the human body to a single heavy metal, making the evaluation of the safety results of the remediated soil more intuitive. In addition, this method does not use the "control value" of construction land as the remediation standard, but refers to the human tolerance value to judge whether the contaminated construction land will cause harm to the human body, so as to decide whether to take remediation measures for it.

[0170] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0171] References to "one embodiment", "another embodiment", "embodiment", etc. in this specification refer to specific features, structures or characteristics described in conjunction with the embodiment as included in at least one embodiment generally described in this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Further, when a specific feature, structure or characteristic is described in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present invention.

[0172] Although the present invention is described herein with reference to a plurality of illustrative embodiments of the present invention, it should be understood that those skilled in the art may devise many other modifications and implementations that fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope of the present disclosure and claims, a variety of variations and improvements may be made to the components and / or layout of the subject combination layout. In addition to variations and improvements made to the components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. A method for evaluating the restoration effect of construction land based on health risks, characterized in that include: Step s1: taking heavy metal contaminated soil and determining the amount of heavy metal elements in the contaminated soil; Step s2: Analyze the morphological composition of heavy metals in the soil; Step s3: Calculate the amount of heavy metals in the contaminated soil that enter the human body through different pathways every day; step s3 includes the amount of a single heavy metal that enters the human body through skin contact, in mg: W1=SAE×SSAR×ABS d ×ASS×10 -6 ; SAE=239×H 0.417 ×BW 0.517 ×SER; Where: SAE is the exposed skin surface area of ​​the human body, in cm 2 ; SSAR is the human skin surface adhesion coefficient, unit: mg / cm 2 ; ABS d is the skin contact absorption efficiency factor, dimensionless; ASS is the amount of acid-soluble heavy metals in the soil, in mg / kg; H is the average height of the population, in cm; BW is the mean body weight of the population, in kg; In step s3, the amount of a single heavy metal entering the human body through breathing every day is included, in mg: W2=PM 10 ×DAIR×PIFA×(fspi×EFI+fspo×EFO)×ASS×10 -6 ; Where: PM 10 is the content of inhalable suspended particulate matter in the air, mg / m 3 ; DAIR is the daily air breathing volume of the human body, m 3 / d; PIFA is the proportion of inhaled soil particles retained in the body, dimensionless; fspi is the proportion of soil particles in indoor air, dimensionless; fspo is the proportion of soil particles in outdoor air, dimensionless; EFI is the human exposure frequency indoors, in d; EFO is the human body’s outdoor exposure frequency, in d; In step s3, the amount of a single heavy metal entering the human body through the oral cavity per day is included, in mg; <h2 style=";text-align:left;direction:ltr">W3 = OSIR × ABS × ASS × 10<h2 style=";text-align:left;direction:ltr"> -6 <h2 style=";text-align:left;direction:ltr"> ; Where: OSIR is the daily soil intake of humans, mg; ABSo is the absorption efficiency factor for oral intake, dimensionless; Then the amount of a single heavy metal acid that enters the human body in soluble form is W1+W2+W3; Step s4: Compare the amount of acid-soluble heavy metal that enters the human body before remediation with the daily tolerance value of the human body to the single metal to determine whether it exceeds the human body's tolerance range; if it exceeds the human body's tolerance range, remediate it; otherwise, it is safe soil and no remediation measures are required; Step s5: taking the repaired soil and analyzing the form composition of heavy metals in the soil; Step s6: Calculate the amount of single heavy metal acid-soluble state entering the human body after repair, and compare it with the human body's daily tolerance value for the single metal to determine whether it is lower than the human body's tolerance range. If it is lower, the repair effect is up to standard, otherwise it is unsafe and other means of repair are required.

2. The construction land restoration effect evaluation method based on health risk according to claim 1 is characterized in that In the step s1, heavy metal contaminated soil is sampled by a five-point sampling method.

3. The construction land restoration effect evaluation method based on health risks according to claim 2 is characterized in that In the step s1, the heavy metal contaminated soil obtained by the five-point sampling method is mixed evenly and then the amount of heavy metal elements in the contaminated soil is determined by XRF.

4. The construction land restoration effect evaluation method based on health risk according to claim 1 is characterized in that In step s2, the BCR sequential extraction method is used to analyze the morphological composition of heavy metals in the soil.

5. The construction land restoration effect evaluation method based on health risk according to claim 1 is characterized in that In step s5, the modified BCR sequential extraction method is used to analyze the morphological composition of heavy metals in the soil.

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