Polycyclic aromatic hydrocarbons(PAHs)and hydroxylated polycyclic aromatic hydrocarbons(OH-PAHs)were investigated in the soil of the Fildes Peninsula,Antarctica.Various analytes were detected,and the concentration of OH-PAHs was 0.3001.847 ng g 1 dry weight,with the dominant components being danthron and 1-hydroxy-phenanthrene.The relationship between soil total organic matter(TOM),OH-PAHs,and the parent PAHs in the soil was studied.No significant correlation was detected between the spatial distribution of OH-PAHs and the occurrence of PAHs,whereas a positive correlation with TOM was found.
LI RuijingGAO YunzeGAO HuiJIN ShuaichenCAO ShengkaiYE JiandongNA Guangshui
This study developed a method to perform the simultaneous concentration and selective separation of66(ultra) trace persistent toxic substances in Antarctic waters. The substances included 30 polychlorinated biphenyls, 17 organochlorine pesticides, 16 polycyclic aromatic hydrocarbons, 3hexabromocyclododecanes. Solid phase extraction was performed using a C18 membrane and silica gel column. Gradient elution was conducted using organic solvents with different polarities; as a result, the efficiency of the C18 film is improved and the interferences from impurities and target compounds are eliminated. Extracts were subsequently analyzed through gas chromatography or liquid and gas chromatography coupled to tandem mass spectrometry. Method validation yielded the following values:recoveries of all target analytes in the Antarctic water ranged from 87.3% to 117.6% and reproducibility as percent relative standard deviation was lower than 5%. Quantification limits ranged from 0.004 mg L 1[2_TD$IF]to0.030 mg L 1. The established method improved the recoveries and reduced the limits of detection.Results indicated the method exhibited good performance in the simultaneous concentration and selective separation of 66(ultra) trace organic pollutants; Therefore, the proposed sample pretreatment can potentially eliminate the effects of various classes of impurities to some extent.
Li ZhangGuang-Shui NaChun-Xiang HeRui-Jing LiHui GaoLin-Ke GeYan-Jie WangYao Yao
In recent years, Dechloranes have been widely detected in the environment around the world.However, understanding and knowledge of Dechloranes in remote regions, such as the Arctic,remain lacking. Therefore, the concentrations of 5 Dechloranes in surface seawater, sediment,soil, moss, and dung collected from Ny-lesund in the Arctic were measured with the concentrations 93 pg/L, 342, 325, 1.4, and 258 pg/g, respectively, which were much lower than those in Asian and European regions. The mean ratios of anti-Dechlorane Plus(DP) to total DP(fanti) in seawater, sediment, soil, moss, dung, and atmospheric samples were 0.36, 0.21, 0.18,0.27, 0.66, and 0.43, respectively. Results suggested that the main source of DP in seawater,sediment, soil, and moss was long-range atmospheric transport. However, the ratio identified in dung was different, for which the migration behavior of the organism is probably the main source of DP.
Guangshui NaWei WeiShiyao ZhouHui GaoXindong MaLina QiuLinke GeChenguang BaoZiwei Yao
为了解六溴环十二烷(HBCDs)在海洋沉积物中的好氧微生物降解特性,在以HBCDs为唯一碳源的无机培养基中添加海洋沉积物悬浮液,利用HPLC-MS/MS测定HBCDs降解率,并驯化分离得到HBCDs降解菌株,进行菌种鉴定.结果显示:海洋沉积物好氧微生物对HBCDs的降解半衰期为38-61 d;在120 d中HBCDs共降解了72%;从海洋沉积物中富集、分离得到5株能够以HBCDs为唯一碳源的降解菌株,分别命名为CTF711-A、CTF711-C、CTF711-D、CTF711-E和CTF711-X,结合形态学观察、生理生化试验和16S r DNA序列分析,将其依次鉴别为假单胞菌属、红球菌属、不动杆菌属、微杆菌属和盐单胞菌属,除假单胞菌属外,其余菌株对HBCDs的降解能力还尚未见报道.同时将这5株菌分别培养与混合培养,混合菌株对HBCDs降解率最高.本研究报道了5株不同属的HBCDs好氧降解菌株,且混合菌株对HBCDs降解效果较好,结果可为HBCDs的生物修复提供理论和应用依据.
