Total PAHs content decreased as the time extended, and the rate was rather high at the initial stage, and then slowed down in the rest of time.
三种土壤中菲和芘总量都随着时间的延长而降低，降低速率上呈现出先快后慢的特点。
The total-PAHs content in the fly ash of electrostatic precipitator inlet increases with the boiler charge increasing and the PAHs content of fly ash varies widely in every electric field.
电除尘器飞灰中多环芳烃的总生成量随着锅炉负荷量的增加呈增加的趋势，在电除尘器各个电场中的分布量有明显的差异。
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