In the same preparation method as PM2.5 model particle bank, the reserve liquid containing Zn is increased according to a specific proportion of Zn (CH3COO)2 input, and is equipped with a concentration gradient solution to ensure that Zn content accounts for 1%, 2%, 4% and maintains the concentration of other pollutants consistent with C-Cd-Cu material in pm2.5 model particle bank.
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