Early pre-treatment method for measuring content of chemical components in graphite

The invention discloses an early pre-treatment method for measuring content of chemical components in graphite. The method comprises the steps: (1), weighing 0.1-0.5 g of a graphite sample in a digestion tank, adding slowly 2-3 mL of nitric acid, 0.2-1.0 mL of hydrofluoric acid, 0.5-1 mL of sulfuric acid, and 0.2-1.0 mL of perchloric acid, and mixing well the graphite sample with acid reagents; (2), placing the digestion tank on a microwave digestion system, starting to heat under the power of 600W, holding the temperature raised to 240-260 DEG C for not shorter than 45 min, stopping the microwave digestion system, naturally cooling, removing the digestion tank from the microwave digestion system when the temperature drops to below 70 DEG C, slowly opening the digestion tank, pouring to a polytetrafluoroethylene flask, and metering the volume with a 100 mL plastic colorimetric tube. By using the method, it is possible to disintegrate the graphite sample at a temperature lower than 300 DEG C without element lo