【摘要】：對(duì)溢油污染灘涂集中掩埋區(qū)域周邊水環(huán)境進(jìn)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(cè)了16種優(yōu)控PAHs,分析了其組成分布動(dòng)態(tài)特征,并評(píng)價(jià)其生態(tài)風(fēng)險(xiǎn)。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(yuǎn)低于我國(guó)《生活飲用水衛(wèi)生國(guó)家標(biāo)準(zhǔn)》(GB 5749-2006)規(guī)定PAHs總量(2.0μg/L)。集中掩埋應(yīng)急處置后,灘涂周邊水體中PAHs的濃度持續(xù)下降,直至12個(gè)月后對(duì)掩埋污染沉積物二次處置時(shí),水環(huán)境中PAHs濃度受擾動(dòng)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(yīng)急處置剛完成時(shí),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(shí)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(lái)越高。采用風(fēng)險(xiǎn)系數(shù)法計(jì)算7種PAHs的風(fēng)險(xiǎn)商值,商值范圍為ND~3.80×10~(-4),均遠(yuǎn)小于風(fēng)險(xiǎn)界值1,PAHs對(duì)水生生態(tài)系統(tǒng)的風(fēng)險(xiǎn)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(hào)：2204818