1. Wet digestion treatment plan for lithium batteries: determination of nickel cobalt lithium material (determination of nickel, cobalt, and manganese content in nickel cobalt manganese oxide lithium material for lithium-ion batteries) 2. Determination of matrix metal impurities in electronic grade polycrystalline silicon: iron, chromium, nickel, copper, zinc, sodium. Wet digestion treatment scheme for lithium batteries - determination of iron content A combination of graphite digestion instrument or aluminum alloy anti-corrosion electric heating plate+PFA or PTFE beaker can be used for digestion After digestion, transfer to a PFA or FEP volumetric flask for constant volume, dilute with water, and finally use analytical instruments such as ICP-MS to measure elemental data