As Hg. Except wood ear, tremella and their products. For the food with the mercury methyl limit, the total mercury can be determined first. When the total mercury content does not exceed the mercury methyl limit, it can be determined that it meets the limit requirements without the need to determine mercury methyl; Otherwise, determine the mercury methyl content.
As As. Except tricholoma matsutake, wood ear, tremella and their products. For the food with the inorganic arsenic limit, the total arsenic can be determined first. When the total arsenic content does not exceed the inorganic arsenic limit, it can be determined that it meets the limit requirements without the need to determine inorganic arsenic; Otherwise, determine the inorganic arsenic content.