海水中氨氮现场自动监测技术化学工艺及试剂保存方法优化研究   总被引：1，自引：0，他引：1  

张国栋  张曼平  李慧玲  秦延文 《中国海洋大学学报(自然科学版)》1999,(Z1)

为了满足氨氮的水下现场自动分析的要求,作者对次溴酸盐氧化法测定海水中氨氮的规范分析方法进行了实验室系列条件优化;并通过对试剂保存方法的研究,解决了试剂稳定性问题。通过这两方面的工作,保证了海水中氨氮测定方法能在水下现场自动分析仪上顺利实现。  相似文献   

Correlation and Prediction of the Solubility of Air Gases in Saline Solutions for Mining Processes,Using Artificial Neural Networks     

《洁净——土壤、空气、水》2017,45(2)

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泡沫镍为集流体的膜电容去离子脱盐性能研究          下载免费PDF全文

范新飞  沈彤  安金硕  宋成文 《海洋开发与管理》2020,37(9):91-96

文章为了解决淡水资源短缺这一严峻的问题,考虑将能耗小、无化学再生等优点的膜电容去离子技术作为基础,对其进行改进与优化,即将低电阻、高比表面积和高孔隙率的泡沫镍替代传统集流体。并利用改进后的装置进行实验,分别探讨电极材料、电压和盐水流速等因素对脱盐效率的影响。将未加电极材料和加3种不同的活性炭作为电极材料的装置进行脱盐实验,根据结果得出,在脱盐过程中起主要作用的仍然是电吸附过程,通过进一步对电极材料进行表征,讨论得出脱盐效率与比表面积和孔径分布均有关系。随后在最优电极材料的条件下,讨论得出最优的操作条件,即在施加电压为1.6 V、盐水流速为10 mL/min下可以达到最佳的脱盐效率,吸附量为8.9 mg/g。且通过长时间的吸脱附实验得出电极材料AC1具有良好的再生能力。  相似文献   

Sorption behaviour of benzyl butyl phthalate on marine sediments: Equilibrium assessments, effects of organic carbon content, temperature and salinity   总被引：2，自引：0，他引：2  

Xiang-Rong Xu  Xiao-Yan Li   《Marine Chemistry》2009,115(1-2):66-71

Benzyl butyl phthalate (BBP) is an endocrine-disrupting chemical, and its sorption behaviour on marine sediments was investigated. BBP sorption on the sediments was a rapid process, which could reach equilibrium in 6 h. The sorption equilibrium results could be well described by a linear isotherm. The BBP partition coefficient, K_d, varied from 7.16 to 12.54 L/g in approximately proportion to the organic content of the sediments. After H₂O₂ oxidation for removing the organic material from the sediments, the K_d values were reduced by more than 70%, but the organic normalised partition coefficient averaged 2165 L/g for the H₂O₂-treated sediments, which was more than three times of 598 L/g for the raw sediments. The sorption of BBP on the sediments increased with a decrease in temperature and an increase in salinity. A salting constant of 1.14 L/mol was obtained for BBP in artificial seawater. These research findings are of importance to an assessment of the fate and transport of BBP and other similar endocrine-disrupting chemicals (EDCs) in seawater–sediment systems.  相似文献   

Black carbon in marine particulate organic carbon: Inputs and cycling of highly recalcitrant organic carbon in the Gulf of Maine   总被引：2，自引：0，他引：2  

D. Xanat Flores-Cervantes  Desiree L. Plata  John K. MacFarlane  Christopher M. Reddy  Philip M. Gschwend   《Marine Chemistry》2009,113(3-4):172-181

To increase our understanding of the roles of black carbon (BC), a highly sorptive and recalcitrant material, we measured BC concentrations and fluxes in marine particulate organic carbon (POC) out of the water column in the Gulf of Maine (GoM), a representative coastal area downwind of important BC sources of the Northeastern United States. Concentrations ranged from < 0.1 to 16 μg/L in the spring and late summer, typically contributing between 1 and 20% of the POC. Water-column export fluxes were near 10 g_BC/m²∙yr. These observations suggest that (a) up to 50% of the “molecularly uncharacterized” POC in this region's seawater is combustion-derived BC, and (b) the “bioavailabilities” of hydrophobic pollutants like polycyclic aromatic hydrocarbons (PAHs) would be influenced substantially by sorption to BC. The observed BC spatial distributions imply that a large part of the BC was carried offshore by wind and that much of it is accumulated in the coastal sediments. On a global scale, these results suggest the GoM and other coastal areas with similar BC loadings accumulate significant amounts of highly recalcitrant organic carbon that remineralizes on geological time scales in the world's oceans.  相似文献   

海水池塘混合施肥养殖台湾红罗非鱼的鱼产力和负荷力   总被引：2，自引：0，他引：2  

杨红生  李德尚  董双林  卢敬让  徐宁  张鸿雁 《海洋与湖沼》2000,31(2):117-122

于１９９５年７—９月,在烟台市黄海水产集团公司第二养虾场,采用围隔实验法研究了海水池塘混合施肥养殖台湾红罗非鱼的鱼产力、负荷力和最适放养量。实验中每个围隔面积为 ５ｍ×５ｍ,各设 １台 ９０Ｗ的搅水机（４ ８００ｒ／ ｈ）。每日施肥基准为：鸡粪干物质, ２５ｋｇ／ｈａ：氮肥, Ｎ０．１５× １０－６;磷肥,Ｐ０．０１５× １０－６。结果表明,静水海水池塘混合施肥的鱼产力为０．７９ｇ／（ｍ２·ｄ）,池塘对台湾红罗非鱼的负荷力为１７９６．０ｋｇ／ｈａ,鱼（体重７０ｇ／ｉｎｄ）的最适放养量约为８０００ｉｎｄ／ｈａ。  相似文献