煤炭灰中的稀土元素造成的生态和健康风险
Latinka Slavković-Beškoski1, Ljubiša Ignjatović2, Mirjana Ćujić3
1Anahem Laboratory, Mocartova 10, 11160 Belgrade, Serbia.
Toxics
|January 22, 2024
概括
煤炭飞灰含有易和稀土元素 (REY) 含有轻度REY丰富. 虽然REY带来了较低的生态和健康风险,但煤炭飞灰中的重金属对人类健康构成重大危险.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 毒理学 毒理学 毒理学
背景情况:
- 燃煤飞灰 (CFA) 是燃煤发电厂 (CFPP) 的一个副产品.
- 了解和稀土元素 (REY) 和重金属 (HM) 在CFA中的分布和风险对于环境和健康评估至关重要.
研究的目的:
- 分析来自五个CFPP的CFA中的REY,主要元素和HM的发生和分布.
- 评估与CFA中的REYs相关的生态和人类健康风险.
主要方法:
- 对CFA样本进行元素分析,以确定REY,主要元素和HMs的度.
- 使用已建立的生态 (风险指数 - RI) 和人类健康 (危害指数 - HI,向癌症风险 - TCR) 影响指数进行风险评估.
主要成果:
- REY的丰度按照以下顺序进行:Ce > La > Nd > Y > Pr > Gd > Sm > Dy > Er > Yb > Eu > Ho > Tb > Tm > Lu,平均总REY含量为302 mg/kg.
- CFA 呈现轻度 REY 丰富 (平均轻度-重度 REY 比率为 4.1) 和 REY 之间的显著正相关性.
- 与REY相关的生态风险低至中度 (RI:66245),人类健康风险 (儿童HIc = 0.15,TCRc = 8.4 × 10-16),低于安全限值.
- 相反,CFA中的HM对人类健康构成重大风险,超过安全值 (儿童的HIc=5.74,TCRCc=2.6×10−4).
结论:
- 在CFA中的REY度通常不是生态或人类健康风险的主要关注点.
- 在CFA中存在的重金属代表了相当大的环境和健康危害,超过了REYs带来的风险.
- 有效管理CFA应优先考虑减轻重金属污染,以保护人类健康和生态系统.
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