黄河迳流对汞存在、迁移、形态和归宿的影响(英文)     

陆贤昆  杨敏  石建德  冯晓炬 《中国海洋大学学报(自然科学版)》1990,(1)

于1983—1985年采集黄河口及邻海沉积物、海水及悬浮颗粒物样品,测定了底质总汞、海水总汞、溶解总汞、无机汞及悬浮颗粒物总汞。所测定的各种汞的形态均列于世界河口区最低的浓度水平。枯水期无机汞和海水总汞分布相对均匀。丰水期溶解总汞分布均匀,而无机汞、颗粒汞和海水总汞都显示出与盐度、颗粒物含量相似的梯度分布。显示了黄河迳流及所携带大量悬浮颗粒物的重要影响。黄河水的无机特征和海水相对高的有机物含量,使无机汞入海后部分转变成有机汞,同时海水与河水的颗粒汞出现明显差别。底质汞与中值粒径线性相关,颗粒汞与颗粒物含量双曲线相关。近河口区盐度、颗粒物含量及颗粒汞含量有明显分层现象。  相似文献   

SIMPLE SIMULATION OF THE ANNUAL VARIATION OF THE SPECIFIC PHOTOSYNTHESIS RATE IN JIAOZHOU BAY     

任玲张曼平  陆贤昆冯士笮 Uwe.H.Brockmann 《中国海洋湖沼学报》2001,19(1):63-72

A simple diagnostic simulation of the annual cycling of the surface specific photosynthesis rate (SPR) in Jiaazhou Bay is described in this paper. Light intensity, temperature and nutrients(nitrate ammonia, phosphate) were considered as main factors controlling photosynthesis of phytoplankton and were introduced into the model by different function equations. The simulated variation ofspecific photosynthesis rate coincided with the measured data. Analysis of the effect of every factor onphotosynthesis indicated that the variation of photosynthesis rate was controlled by all these three factors,while temperature showed good correlation with SPR as measurement showed. This diagnostic simulationyielded the values of some parameter relating with the photosynthesis in Jiaozhou Bay.  相似文献   

海水营养盐自动测定研究——Ⅲ.磷酸盐和硅酸盐的反流动注射分析     

康代温  陈露  陆贤昆 《海洋学报》1991,13(1):60-67

采用因子设计和单纯形优化对反流动注射分析测定海水中的PO₄3和SiO₃2进行了条件优化选择.设计的分析线路可以实现PO₄3、SiO₃2连续测定.样品测定速度为30个/h.PO₄3的测定存在明显的盐效应.SiO₃2的测定没有盐效应.彼此之间的干扰可以忽略.对实际样品测定并与规范法对比,二者结果基本一致.  相似文献   

在线冷阱捕集氢化物法流液测定海水中砷和锑   总被引：1，自引：0，他引：1  

陆贤昆  李静  陈淑珠  戴国升 《海洋学报》1989,11(4):444-449

本文提出了一自动流液系统,在线液氮冷阱捕集氢化物、无焰原子吸收法测定海水中无机砷和锑对反应酸度、硼氢化钠用量、载气(高纯氮)流量等进行条件实验和最佳化选择,该法的检出限砷为0.15μg/l,锑为0.24μg/l在测定微克/升级海水样品时,砷和锑的变异系数分别为±4%和±10%一次测定消耗样品量分别为:砷9ml,锑12ml测定频率分别为:砷20个/小时,锑15个/小时.  相似文献   

胶州湾东部锡的输入、形态特征和生物地球化学过程   总被引：3，自引：0，他引：3  

陆贤昆  韩峰  祝惠英  李静 《海洋学报》1995,17(2):51-60

自1990年7月～1991年5月取样测量了胶州湾东部各形态锡的季节序列变化.溶解无机锡、有机锡和颗粒态锡的百分比表明了锡形态分布的区域特征及可能的输入.丰水期(7月),各形态锡出现异常高值(DISn76.7ng/dm3,DOSn546.1ng/dm3,PSn688.6ng/dm3),表明陆源输入的主要作用.随着湾内海水盐度升高,溶解态无机、有机锡呈现外海低值的特征,但颗粒锡占据了绝对比例.极高的颗粒物富集因子(8.5×104～2.2×105)和浮游生物富集因子(5.1×104～7.0×105),说明水体锡的强颗粒物活性和生物获得性,对排除无机、有机锡起重要作用.相反,沉积物中锡的甲基化则将是锡从沉积转入水体的重要途径.  相似文献   

海水营养盐自动测定研究Ⅱ.氨氮的反流动注射分析   总被引：4，自引：0，他引：4  

陆贤昆  康代温  洪伟良 《海洋与湖沼》1991,22(4):389-395

自从流动注射分析技术提出以后,很多作者用于测定水中氨氮的研究。其主要测定方法有奈氏试剂法、气体扩散法、电测法等。这些方法有的检出限较高,不适于海水中NH_4~+-N的测定,有的则还没有直接应用于海水介质中。Johnson等提出了反流动注射分析技术,利用样品分散度低的特点,使分析灵敏度显著提高,并对海水中NO_3~-,NO_2~-,PO_4~(3-),SiO_3~(2-),的测定进行了研究。鉴于我国调查规范的要求,本文利用流动注射技术对次溴酸钠氧化法进行了研究,并通过因子设计及单纯形最优化选择等条件实验,得到了满意的结果。  相似文献   

METHOD FOR IN SITU DETERMINATION OF Pco2 IN SEA-AIR EQUILIBRIUM SYSTEM     

崔鹤纪雷  王军辛淑平  张龙军陆贤昆 《中国海洋湖沼学报》2001,19(2):172-177

The method for determining Pco2 in the atmosphere and water by using gas chroma-tography was studied. For determination of Pco2 in the atmosphere, a sampling method was developed in which the chromatograph was connected to a 6-port valve with a sampling pipe opening to the atmosphere, so gas pressure in the sampling pipe was identical to that of the atmoesphere. A semi-automatic seawater-atmosphere equilibrium system was designed to determine the Pco2 in seawater. The equilibrium chamber contained in situ seawater and the well-equilibrated gas was pushed into the sampling pipe by sample wa-ter, so pressure and temperature calibration could be avoided. This method has high accuracy for the de-termination of Pco2 in the air and seawater, and was used for in situ determination of Pco2 in the atmo-sphere and of the seawater sample in the JGOFS cruise in the East China Sea.  相似文献