GEOCHEMICAL CHARACTERISTICS OF SUPERGENE ORGANIC MATTER IN HYPERSALINE ENVIRONMENT

The source rocks and crude oils from the Qianjiang Formation (Eocene) in the Jiangban basin have been systematically studied in the present work. Supergene hydrocarboholds are characterized by (ⅰ) high alteration ratio of soluble organic matter over organic carbon and middle ratio of hydrocarbon over organic carbon; (ⅱ) high content of non-hydrocarbon plus asphahene in extracts or crude oils; (ⅲ) sulfur-rich crude oils being an important immature crude oil; (ⅳ) alkane showing high content of phytane, gammacerane and marked even-carbon predominance or odd-carbon predominance; (ⅴ) aromatic biomarkers being distinctly classified into four groups; (ⅵ) pronounced evencarbon predominance in alkyl henzenes. In combination of all geochemical data. it is extrapolated that exploration of immature crude oil in hypersaline environment should be noticed.     

湘湖的自然地理及其兴废过程

萧山市湘湖是古代宁绍平原湖泊中众废残存的特例其前身西城湖早已埂废.北 宋 政和二年 (1 112年 ),因农业需要,在特殊的地理环境下又废田复湖.从北宋末至民国 间八百多年对湘湖主禁、主垦两派斗争激烈.1 9 4 9年以来,由于农田水利建设的发展,湘湖原有灌概职能减小,围垦扩大,成为目前一条狭长的河流型湖泊.但湘湖粘土层宜制砖瓦,挖泥造成深潭,出现了又一次还湖的情况,重新恢复的湘湖,为旅游业的发展创造了美 好的前景     

Analysis of antibiotics from liquid sample using electrospray ionization-ion mobility spectrometry

The recent findings of antibiotic residues in aquatic environment at trace level have gained much concern for the detrimental effect on ecological and human health due to bacterial resistance. Here, the feasibility of using electrospray ionization ion mobility spectrometry (ESI-IMS) for analysis antibiotics in liquid sample is demonstrated. Reduced mobilities and collision cross sections of 18 antibiotics are experimentally measured and compared with theoretical values according to mass-mobility correlation. Gentamicin is used as an example to investigate the capability of ESI-IMS for multi-component analysis of antibiotics. Mixtures of antibiotics at different concentrations are analyzed. The estimated detection limit for amoxicillin is 0.7 mg L⁻¹ (70 pg) and the linear range of response maintains over two orders. This method will be a potential technique for the analysis of antibiotics in aquatic environment.