Study on Metal Contents and Dissolution Law of Discarded Circuit Board
The environmental problems caused by metals in electronic waste are increasing day by day.In this paper,microwave digestion method was used to study the distribution and composition of metals in printed circuit boards of electronic waste,and the leaching law of metals from circuit boards by preparing simulated acid rain solutions was analyzed.The results showed that using an atomic absorption spectrometer to test the metal content in circuit boards,a total of 12 types of metals were detected in discarded circuit boards,accounting for approximately 37.3%of the total weight of the circuit boards.Among them,seven metals showed good dissolution performance in a strongly acidic environment with a pH value of 1.The dissolution degree ranked from high to low was copper,iron,zinc,lead,nickel,chromium,and cadmium.Among them,cadmium had the highest dissolution ratio and the fastest dissolution rate.The research results provide a basis for evaluating the potential ability of metals to dissolve from discarded circuit boards under acid rain conditions,and provide basic data for analyzing the environmental hazards of discarded circuit boards and measuring their ecological risks.
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