【摘要】：對溢油污染灘涂集中掩埋區(qū)域周邊水環(huán)境進行漲落潮混合采樣分析,采用氣相色譜質(zhì)譜聯(lián)用法檢測了16種優(yōu)控PAHs,分析了其組成分布動態(tài)特征,并評價其生態(tài)風險。結(jié)果表明:∑PAHs濃度范圍為ND~148.00 ng/L,平均濃度為50.97 ng/L,遠低于我國《生活飲用水衛(wèi)生國家標準》(GB 5749-2006)規(guī)定PAHs總量(2.0μg/L)。集中掩埋應急處置后,灘涂周邊水體中PAHs的濃度持續(xù)下降,直至12個月后對掩埋污染沉積物二次處置時,水環(huán)境中PAHs濃度受擾動影響大幅升高。水環(huán)境多環(huán)芳烴中共檢出萘、苊、芴、菲、蒽、熒蒽、芘等7種單體,其中菲的含量最高,檢出率也最高為52%,是水環(huán)境中多環(huán)芳烴的典型特征單體,與∑PAHs呈顯著正相關(guān)關(guān)系(R2=0.913)。應急處置剛完成時,水環(huán)境中檢出PAHs以二環(huán)(56.6%)和三環(huán)(38.2%)為主,但因二環(huán)PAHs較易揮發(fā)降解,隨著時間推移,水環(huán)境中檢出PAHs以三環(huán)(61.2%~65.5%)和四環(huán)(34.5%~38.8%)為主,且較難降解的四環(huán)PAHs比例越來越高。采用風險系數(shù)法計算7種PAHs的風險商值,商值范圍為ND~3.80×10~(-4),均遠小于風險界值1,PAHs對水生生態(tài)系統(tǒng)的風險較低。
[Abstract]:The mixed sampling of fluctuating tide and fluctuating tide was carried out in the surrounding water environment of the concentrated buried area of oil-spill polluted beach. Sixteen kinds of optimal PAHs, were detected by gas chromatography-mass spectrometry (GC-MS) to analyze the dynamic characteristics of their composition and distribution, and their ecological risks were evaluated. The results showed that the mean concentration of 鈭，

本文編號：2204818