2025 Volume 48 Pages 51-59
To investigate a method of evaluating the maximum risk of various metal elements eluted from illegally dumped home appliances, pellet samples of copper, lead, zinc, and antimony, and crushed waste PC parts (printed circuit boards, cathode-ray tube glass, and liquid-crystal displays panels) were immersed in elution solution for 60 days. Then the elution amounts and behaviors of various elements were determined. The elution amounts of metals increased over a long period of time in both the pellet and waste PC crushed material samples, suggesting that the Notification 13 elution test with a shaking elution time of 6 h is not applicable to the evaluation of long-term elution behavior, such as estimating the maximum risk of illegally dumped waste. Although the elution rate after 60 days of immersion was lower in some cases than that of long-term shaking using a high-speed stirrer, the maximum elution amounts were not significantly different. Such results suggested that the immersion test method without continuous shaking was effective. Moreover, we found that the relationship between time and elution rate can be classified into several patterns.
