| abstract |
An analytical method for simultaneously determining a content of harmful heavy metals in an edible fungi cultivation matrix by using combined digestion, including weighing 0.35 g (accurate to 0.0001 g) of a matrix sample which has been air-dried, ground and sieved through a C0.15 mm; placing the matrix sample in a Poly tetra fluoroethylene (PTFE) microwave digestion tank; adding 6 mL of nitric acid and soaking overnight, and then adding 2 mL of hydrogen peroxide to perform microwave digestion. After the digestion is complete and cooled, performing the acid-driven to 0.5-1.0 mL at 130 °C, and taking the matrix sample down for cooling. The digestion liquid is transferred to a 25 mL volumetric flask with ultra pure water to perform a constant volume. The measuring method has high accuracy, simple and quick operation, is suitable for batch measurement, and improves work efficiency. |