Distribution of Boron in Some Egyptian Aquatic Environments     

Doaa Hassan Youssef 《Journal of Oceanography》2003,59(5):537-544

Concentrations of boron in seawater (from four regions along the Alexandria coastline, subjected to land disposal), brackish water (Lake Edku) and drains water (e.g. El-Umum Drain) were determined during the period from February to August 2000. Boron was determined spectrophotometrically by a modified curcumin method. For Lake Edku, boron concentration fluctuated between 0.023 and 0.105 mmol/l. There are several factors that affect the concentration of B in the Lake water: (a) effect of the drainage water via El-Khairy and Barsiek Drains, (b) utilization of boron by hydrophytes, and (c) water exchange through the sea-lake connection. It may be concluded that the level of boron in the Lake water cannot be considered a substantial hazard to the Lake organisms. Boron concentration varied from 0.392 to 0.522 mmol/l in seawater samples and from 0.141 to 0.458 mmol/l in the sites where the water from the drains (El-Umum Drain and El-Noubaria Canal) mixed with the seawater. The broader variation of boron (mmol/l)/salinity ratios for seawater samples (0.0106–0.0138) may be due to that the samples were collected from the upper seawater layers, where contributions from land run-off, atmospheric precipitation and differences in the biota affect the concentration. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

湄洲湾夏季油的分布特征与防护对策     

王宪  陈于望 《台湾海峡》1996,15(3):265-269

本文根据１９９２年夏季对湄洲湾水质环境质量调查资料，对该海区海水中油的含量及分布特征进行了分析研究。结果表明：湄洲湾夏季表层海水油的含量为５－５１μｇ／ｄｍ＾３，平均值为１９．８μｇ／ｄｍ＾３。海水的混合系数较小，高潮和低潮时油含量分布的差异，除了与陆源污染源分布有关外，主要是由水文动力学条件所决定。  相似文献   

ICES baseline survey of trace metals in European shelf waters   总被引：1，自引：0，他引：1  

Balls  P.; Cofino  W.; Schmidt  D.; Topping  G.; Wilson  S.; Yeats  P. 《ICES Journal of Marine Science》1993,50(4):435-444

  相似文献   

海口湾的溶解氧及海水水质指标限制值问题   总被引：4，自引：0，他引：4  

陈春华 《海洋学报》2006,28(2):146-150

海水溶解氧对海洋生物的生存、生长和发育相当重要,与生物活动有着密切的联系,它的含量变化是反映生物生长状况的一个重要标志,同时也是污染监测的重要指标.海口湾是海南省的重点海域,1989年以来,陈春华等对海口湾的环境问题进行了大量的研究[1~6],本论文就海口湾的溶解氧监测结果进行分析,并发现了溶解氧水质标准限制值存在的问题.每年在该湾布设10余个站点进行污染监测,有必要对海口湾近7年监测结果进行综合分析.  相似文献   

塞曼石墨炉原子吸收法直接测定海水中的铜     

李攻科  黄卓尔  杨秀环  张展霞 《热带海洋学报》1991,(2)

本文选择酒石酸消除海水基体对铜信号的干扰,用塞曼石墨炉原子吸收法直接测定海水中的铜。从Cu的原子化曲线可知,加入酒石酸后,背景值减小,Cu原子吸收信号增强,且出现时间提前,表明酒石酸是有效的海水基体改进剂。用P.E.Z3030光谱仪测得双蒸水及海水中的元素Cu的特征质量(m。)分别为12.5pg及12.7pg;检测限分别为0.18μg/L和0.19μg/L,表明基体效应已消除,符合海洋监测要求。可用纯Cu标准溶液作校正曲线,以国家海洋局的两个标准海水样品中的Cu评定本法的准确度,相对偏差为0及-4.6%,与经典的经富集后的FAAS法的结果相比,相对偏差在3.0—6.5％范围内。用不同类型的光谱仪测定了30个海水样品,回收率在89—104％范围内。本法操作简便、快速。  相似文献   

大生活用海水生化处理技术研究进展   总被引：2，自引：0，他引：2  

王静  张雨山 《海洋技术学报》2002,21(4):51-53

采用海水作为大生活用水最结解沿海城市淡水资源紧缺局面的有效途径之一。该技术得以推广应用的技术关键是大生活用海水的后处理技术，文章综述了大生活用海水的生化处理技术的研究现状，并提出了今后的研究方向。  相似文献   

海水中一氧化氮的极谱法测定     

任春艳  张正斌  邢磊  刘春颖  刘莲生 《中国海洋大学学报(自然科学版)》2003,33(5):801-808

本文首次采用 Nafion和 Co(salen) /Nafion修饰铂电极测定海水中的 NO,对实验条件进行了选择 ,确定了最佳实验条件 ,即反应池通氮除氧 30 min,富集时间为 4min。同时用线性扫描法对海水中的 NO进行测定 ,测得海水中 NO的浓度与氧化峰电流之间有一定线性关系。对 Nafion修饰电极而言 ,线性范围 1～ 76.9μmol/L,R2 =0 .991 6,检出限为 1 μmol/L。同时对 2种方法修饰的铂电极进行了比较 ,即当 NO浓度在 1 0 -6mol/L数量级时 2种电极基本上无差别 ,而在 1 0 -7mol/L数量级时 Co(salen) /Nafion修饰电极要明显优于 Nafion修饰电极  相似文献   

DPD比色法测定电解海水产生的有效氯浓度   总被引：1，自引：0，他引：1  

陈佼骄  杜敏  韩冰 《海洋技术学报》2006,25(4):61-64

论文是用DPD(N,N-二乙基-1,4-苯二胺)比色法测定电解海水中的有效氯浓度,并将测定结果与碘量滴定法测定有效氯浓度相比较。此外,对该方法在海水中的实验条件进行了试验。结果得出,在海水环境下,DPD比色法在常温下,波长为550 nm,pH值6.5左右,显色后10 m in内测定。在海水中用此方法测定有效氯浓度的范围在0~2 m g/L,误差在5%以下。  相似文献   

Determination of cadmium(II), copper(II), manganese(II) and nickel(II) species in Antarctic seawater with complexing resins   总被引：1，自引：0，他引：1  

Raffaela Biesuz  Giancarla Alberti  Girolamo D'Agostino  Emanuele Magi  Maria Pesavento 《Marine Chemistry》2006,101(3-4):180-189

The strong species of cadmium(II), copper(II), manganese(II) and nickel(II) in an Antarctic seawater sample are investigated by a method based on the sorption of metal ions on complexing resins. The resins compete with the ligands present in the sample to combine with the metal ions. Two resins with different adsorbing strengths were used. Very stable metal complexes were investigated with the strong sorbent Chelex 100 and weaker species with the less strong resin, Amberlite CG-50. Strong species were detected for three of the considered metal ions, but not for Mn(II). Cu(II) is completely linked to species with a side reaction coefficient as high as log α_M(I) = 11.6 at pH = 7.3. The ligand concentration was found to be similar to that of the metal ion, and the conditional stability constant was around 10²⁰ M^− 1. In the considered sample, only a fraction of the metal ions Cd(II) and Ni(II) is bound to the strong ligands, with side reaction coefficients equal to log α_M(I) = 5.5 and 6.5 at pH = 7.3 for Cd(II) and Ni(II), respectively. These findings were confirmed by the test with the weaker sorbent Amberlite CG-50. It can be calculated from the sorption equilibria that neither Mn(II) nor Ni(II) is adsorbed on Amberlite CG-50 under the considered conditions and, in fact, only a negligible fraction of Mn(II) and Ni(II) was adsorbed. A noticeable fraction of Cd(II) was adsorbed on Amberlite CG-50, meaning that cadmium(II) is partially linked to weak ligands, possibly chloride, while no copper(II) was adsorbed on this resin, confirming that copper(II) is only combined in strong species. These results are similar, but not identical, to those obtained for other seawater samples examined in previous investigations.  相似文献   

近岸海水质量量化方法及分类评价   总被引：1，自引：1，他引：1  

曾江宁  黄韦艮  曾淦宁  郑平  周青松  吕海燕  王正方 《海洋学报》2004,26(4):139-146

近岸海域是陆地、海洋和大气之间各种过程相互作用最活跃的界面[1],沿海100km以内区域聚积着约60%的世界人口[2],其环境质量强烈受人类活动影响.对近岸海域进行水质环境管理,应依据海水物理、化学和生物学性质对海水进行分类评价[3,4].  相似文献