# Risk Assessment of Metals in Black Fungus and Culture Substrates Based on Monte Carlo Simulation
The research results of [PERSON] et al. (2007) [7] show that _Ganoderma lucidum_ (Curtis) P. Karst., mushroom and _Agaricus bisporus_ (Large) Sing have a strong ability to enrich heavy metals, have a high tolerance to heavy metals, and can enrich a variety of heavy metals. The same variety of edible fungi can enrich a variety of heavy metals at the same time. [PERSON] et al. (2013) [8] proved that edible fungi could absorb more heavy metals than green plants. [PERSON] et al. (2013) [9] found that the contents of nickel, radiation, chromium and lead in edible fungi were higher than those of corresponding heavy metals in soil, which also indicated that edible fungi could actively absorb heavy metals. [PERSON] et al. (1998) [10] pointed out that mushroom fungi showed obvious affinity for Cu (copper), Ag (argentum) and Cd (cadmium), while wood rot fungi showed an obvious tendency to enrich Cr (chromium), Mg (magnesium), Se (selenium) and Pb (lead). [PERSON] et al. (2007) [7] found that when the Cd content in soil increased, the Cr content in edible fungi was positively correlated with the Cd content in soil, but the lead content in soil had little effect on the lead enrichment in edible fungi. [PERSON] et al. (2002) [11] found that there was a positive correlation between the accumulation of Hg (hydragyrum) and cadmium in edible fungi and the contents of mercury and radiation in soil, while no similar relationship was found for lead. [PERSON] et al. (2011) [12] also studied the relationship between the enrichment of various heavy metals in edible fungi, among which there was a good correlation between Cr and Ni (niccolum), Cd and Mn (magnanese), and Zn (zinc). In China, Jilin and Heilongjiang provinces, the main producing areas of black fungus, account for more than 70% of the national output. At the same time, these areas contain rich mineral deposits, which lead to high levels of metallic elements in the soil. Therefore, the risk of excessive heavy metals in black fungus also increases, but the risk assessment system for these two provinces has not been established. Therefore, a comprehensive study on the assessment of known risk factors and exploration of unknown risk factors in auricularia in these two provinces should be carried out. It is of great significance to effectively identify the potential risks of quality and safety of Chinese black fungus products, scientifically respond to quality and safety emergencies, formulate black fungus pollution control and risk management measures, improve the quality and safety supervision level of black fungus, and promote the healthy development of the black fungus industry. In this study, the Monte Carlo simulation was used to determine the contents of Pb, Cr, Cd and As (arsenic) in 415 black fungus samples from Heilongjiang and Jilin provinces, establish a non-parametric probability assessment system, clarify the heavy metal risk level of black fungus in China, and explore the sources of heavy metal pollution in order to fully grasp the basic situation of black fungus risk factors, provide objective basic data for risk management and provide scientific basis for objective and efficient risk management of the government.