The development of a rapid screening technique to measure antibiotic activity in effluents and surface water samples     

Smith AJ  Balaam JL  Ward A 《Marine pollution bulletin》2007,54(12):1940-1946

Use of antibiotics in medicine, farming and aquaculture results in a continual supply of these pharmaceuticals and their breakdown products reaching the environment. A method has been developed to use for screening environmental samples to establish whether they contain antibiotics. The assay is based on a commercially available test kit and uses some modifications of the test procedure and SPE techniques to deliver a fast, semi-quantifiable result. Development of the assay and results from spiked and environmental samples are discussed.  相似文献   

Stable isotope composition of Hellenic bottled waters     

Dotsika E.  Poutoukis D.  Raco B.  Psomiadis D. 《Journal of Geochemical Exploration》2010

Bottled waters are an increasingly significant product in the human diet. In this work, we present a dataset of stable isotope ratios for bottled waters sampled in Greece. A total of 25 domestic brands of bottled still waters, collected on the Greek market in 2009, were analysed for δ¹⁸O and δ²H. The measured stable isotope ratios range from − 9.9‰ to − 6.9‰ for δ¹⁸O and from − 67.50‰ to − 46.5‰ for δ²H. Comparison of bottled water isotope ratios with natural spring water isotope ratios demonstrates that on average the isotopic composition of bottled water tends to be similar to the composition of naturally available local water sources, showing that bottled water isotope ratios preserve information about the water sources from which they were derived and suggesting that in many cases bottled water should not be considered as an isotopically distinct component of the human diet. This investigation also helped to determine the natural origin of bottled water, and to indicate differences between the natural and production processes. The production process may influence the isotopic composition of waters. No such modification was observed for sampled waters in this study. The isotopic methods applied can be used for the authentication of bottled waters and for use in the regulatory monitoring of water products.  相似文献   

Response of IAP/ LASG GOALS model to the coupling of air-Sea fresh water exchange     

ZhouTianjun  Zhang Xuehong  Yu Yongqiang  Yu Rucong  Liu Xiying  Jin Xiangze 《大气科学进展》2000,17(3):473-486

l.IntroductionWaterPervadesallofthephysicalanddynamicstructureswithintheEarthclimatesys-temthroughamyriadofhydrologicalprocesses.Thehydrologicalcycleinfluencesclimateinavarietyofways,andthereexistsrobustwaterfluxexchangebetweenoceanandatmosphere(Zhouetal.,l999).Theexchangeoffreshwaterbetweenatmosphereandoceanthroughtheair-seainterfaceisoneoftheleastelementsunderstood,butnowisconsideredasoneofthemostimportantelementsoftheclimatesystem,esPeciallyforoceancirculationchangesondecadaltomillennialt…  相似文献   

Thermal water prospecting results at Jelenia Góra-Cieplice (Sudetes, Poland) versus geothermometric forecasts     

J. Dowgiałło 《Environmental Geology》2000,39(5):433-436

 To provide additional volume of thermal water for balneotherapy and space heating the well Cieplice-1 has been deepened from 661 m to 2002.5 m. A spontaneous outflow of water with temperatures reaching 87.8  °C was obtained. Thermal logging revealed 97.7  °C at 1870 m. These results are consistent with earlier estimates based on various chemical geothermometers that indicated water temperatures in the lower parts of the geothermal system possibly exceeding 100  °C. This was also confirmed by the cationic composition geothermometer. The estimates based on the dependence of saturation indices on temperature did not prove correct, suggesting 65  °C as the most probable maximum temperature of the water. Received: 11 Sebtember 1998 · Accepted: 7 January 1999  相似文献   

大亚湾海水微表层生物-化学研究Ⅱ.(二) 生物-化学特性的周日变化规律   总被引：2，自引：0，他引：2  

潘明祥  张正斌  王肇鼎  黄洪辉  韦桂峰  高红莲  彭云辉  朱卓洪 《热带海洋学报》2000,19(2):57-63

1998年 1 1月对大亚湾大鹏澳东山港网箱养殖区进行定点 2 6h连续观测。结果表明 :海水微表层对Chl-a ,PO4—P无富集作用 ,对浊度 ,BOD ,COD和SiO3—Si富集 ,营养盐中氮富集因数的复杂性反映了微表层在调节该养殖区内氮分布上的重要作用 ;海水微、次表层中部分要素分布和周日变化的差异受生物活动的影响较大。  相似文献   

台州列岛海域贝类种类组成与分布特征   总被引：2，自引：0，他引：2  

杨俊毅  高爱根  王永泓  董永庭  王小谷 《海洋学研究》2000,18(1):37-42

根据浙江省海岛资源调查资料 ,对台州列岛海域的贝类作了统计分析。结果表明 ,该区共发现贝类 46种 ,隶属 2纲 8目 2 4科。种类组成以广温广布种为主 ,其次为亚热带种 ,暖温带种和热带种所占的比例较少。全区平均生物量为 1 8.0 6g/m2 ,平均栖息密度为 2 67.1 6个 /m2 。数量季节变化显著。这些特征与海流、沉积物等环境因子密切相关。  相似文献   

Chemical Composition and Geologic History of Saline Waters in Aux Vases and Cypress Formations, Illinois Basin     

Ilham Demir  Beverly Seyler 《Aquatic Geochemistry》1999,5(3):281-311

Seventy-six samples of formation waters were collected from oil wells producing from the Aux Vases or Cypress Formations in the Illinois Basin. Forty core samples of the reservoir rocks were also collected from the two formations. Analyses of the samples indicated that the total dissolved solids content (TDS) of the waters ranged from 43,300 to 151,400 mg/L, far exceeding the 35,400 mg/L of TDS found in typical seawater. Cl-Br relations suggested that high salinities in the Aux Vases and Cypress formation waters resulted from the evaporation of original seawater and subsequent mixing of the evaporated seawater with concentrated halite solutions. Mixing with the halite solutions increased Na and Cl concentrations and diluted the concentration of other ions in the formation waters. The elemental concentrations were influenced further by diagenetic reactions with silicate and carbonate minerals. Diagenetic signatures revealed by fluid chemistry and rock mineralogy delineated the water-rock interactions that took place in the Aux Vases and Cypress sandstones. Dissolution of K-feldspar released K into the solution, leading to the formation of authigenic illite and mixed-layered illite/smectite. Some Mg was removed from the solution by the formation of authigenic chlorite and dolomite. Dolomitization, calcite recrystallization, and contribution from clay minerals raised Sr levels significantly in the formation waters. The trend of increasing TDS of the saline formation waters with depth can be explained with density stratification. But, it is difficult to explain the combination of the increasing TDS and increasing Ca/Na ratio with depth without invoking the controversial 'ion filtration' mechanism.  相似文献   

从藻类化石的垂直分布探讨杭州西湖的演变历程   总被引：4，自引：0，他引：4  

项斯端  赵建康  周宏  王江毅 《海洋与湖沼》1999,30(1):14-24

于１９９４年春在杭州西湖东北面,西面及湖中心小瀛洲３个钻孔共取了７０号岩芯样,经浮选,筛选,以显微镜检鉴定化石藻种,并分析其垂直分布,从而探讨西湖的形成历史,西湖自晚更新世以来的６个化石藻带由下而上依次为：轮藻带,微藻带,微红金颗藻－近缘针杆藻－条纹小环藻带,圆筛藻带,圆筛藻－近缘针杆藻－微红金颗藻桥穹藻－异极藻－短缝藻带和水花束丝藻带,从而反映了西湖的６个发育时期,淡水古湖沼期,淡咸水过渡期,海  相似文献   

秦山核电站邻近水域浮游动物的群落结构和年际变化   总被引：2，自引：0，他引：2  

王春生  杨关铭 《海洋学研究》1999,17(1):37-47

描述了１９９５～１９９６年度秦山核电站邻近水域浮游动物的生物量、丰度、群落结构及其与环境因子的关系,并与１９８９～１９９０年度的资料进行了对比分析。结果表明,秦山核电Ⅰ期工程运行以来,对该水域浮游动物群落结构未产生明显的影响  相似文献   

东沙群岛西南海域单站潮流及温盐特征分析   总被引：1，自引：0，他引：1  

张爱军  江明顺 《热带海洋学报》1999,18(1):31

利用东沙群岛西南海域定点站（２０°４１’Ｎ,１１５°４９’Ｅ）３个航次观测的海流、水温资料及同期的温、盐度断面资料,用谱分析方法对该站海流、水温时间序列进行分析。结果表明,该站海流和水温的时间变化都具有明显的全日周期和半日周期波动的特征,潮流为不规则全日潮,主轴顺时针方向旋转。内潮为全日内潮占优,且具有间歇特征。和总流动类似,斜压运动也主要是顺时针方向旋转的。  相似文献