围隔体内赤潮对扰动的反应     

唐森铭  林昱  陈孝麟  庄栋法 《海洋与湖沼》1995,26(1):7-12

于１９９２年９－１２月，使用中尺度围隔装置（１．７ｍ＾３）研究扰动的水体对赤潮浮游植物种类演替的影响。实验结果表明，对富营养化的围隔水体进行扰动可以改变水体中赤潮生物的演替次序，即甲藻和鞭行藻往往出现在硅藻赤潮之后，本文从另一方面证明，富营养下的相对稳定水体有助于鞭毛藻类赤潮的形成。  相似文献   

蛭石防火板及其在被动防火系统中的应用     

郭冬发  李振涛 《铀矿地质》1998,14(5):308-312

本文介绍了蛭石防火板生产技术原理与工艺技术路线、性能指标及应用要点。作为一种被动矿物防火技术,具有诸多优点,将在被动防火系统中发挥重要作用。  相似文献   

An experimental marine ecosystem response to crude oil and corexit 9527: Part 1—Fate of chemically dispersed crude oil     

C.S. Wong  F.A. Whitney  W.J. Cretney  K. Lee  F. McLaughlin  Jinping Wu Tianbao Fu  Dongfa Zhuang 《Marine environmental research》1984,13(4):247-263

The fate of Prudhoe Bay crude oil. labelled with n(1−¹⁴C)-hexadecane and dispersed with Corexit 9527, was studied for 24 days in a polyethylene bag enclosure of sea water by time-series observations of the alkane composition of the crude oil, oil fluorescence, ¹⁴C-labelled hexadecane in the particulate phase, bacterial biomass, amounts of sedimented material and parameters of temperature, salinity, particulate organic carbon and nitrogen, and nutrients. By the seventh day, convective and diffusive mixing, important mechanisms for the dispersion of oil, resulted in a fairly homogeneous distribution of oil throughout the enclosed water column. Rapid bacterial biodegradation removed the n-alkane fraction initially, while oil-Corexit dispersion suppressed phytoplankton growth. After 7 days, with the recovery of phytoplankton growth, much of the aged oil sedimented with sinking of diatoms.  相似文献   

Multielement Analysis of Deep Sea Ferromanganese Nodules by ICP-MS     

De Yao  Ning Xia  Dongfa Guo  Zhaohui Wu 《Marine Georesources & Geotechnology》2003,21(2):93-103

Deep-sea ferromanganese nodules were dissolved by HNO 3 -HF-HClO in a sealed container at low pressure; HF was evaporated in an open container and salts were dissolved in HCl by heating, then transferred to a 2% HNO 3 solution. Forty-one elements including Li, Be, Sc, Ti, V, Mn, Co, Ni, Cu, Zn, Rb, Sr, Y, Zr, Mo, Cd, In, Sb, Cs, Ba, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Hf, Ta, W, Tl, Pb, Bi, Th and U, were measured by inductively coupled plasma mass spectrometry (ICP-MS). Conditions and sample experiments showed that this procedure is a good experimental method with the characteristics of correct principle, clear interference, easy operation, and reliable results. The concentrations of the 41 elements could be used for resource exploration, environmental assessment, and academic research.  相似文献   

阴离子树脂预处理-离子色谱法测定核纯氢氧化锂中阴离子杂质     

李伯平  王志龙  徐静  崔建勇  郭冬发 《铀矿地质》2019,(1):33-37,64

采用氨型弱阴离子交换树脂预先对核纯氢氧化锂溶液转型,消除核纯氢氧化锂溶液中的游离氢氧根基体,转型后的溶液采用阴离子色谱法同时测定杂质氟离子、氯离子和硫酸根离子。该方法获得的氟离子、氯离子和硫酸根离子加标回收率优于90%,对应检出限分别为:5.0μg/g、 11.0μg/g和24.0μg/g。  相似文献   

热电离飞行时间质谱法用于铀矿勘查的铅同位素示踪     

谢胜凯  郭冬发  谭靖  刘桂方  范增伟  李伯平  王晓明 《铀矿地质》2017,(4):228-233

在自行研制的低成本热电离飞行时间质谱仪(TI-TOF-MS)基础上,开展了应用TI-TOFMS法测定铀矿钻孔样品中铅同位素示踪铀矿勘查的研究。文中介绍了样品的前处理,铅的分离和富集步骤,仪器测量及数据处理等。TI-TOF-MS法测量铅同位素比值~(204)Pb/~(206)Pb、~(207)Pb/~(206)Pb和~(208)Pb/~(206)Pb的精密度分别为0.94%、0.37%和0.14%,可满足铀矿同位素示踪的要求。通过对北方某铀矿钻孔岩心取样的测量结果表明,TI-TOF-MS测量铅同位素的方法能够用于示踪铀矿。  相似文献