THE DEGRADABILITY OF PARTICULATE ORGANIC MATTER IN THE GIRONDE ESTUARY, FRANCE   总被引：4，自引：0，他引：4  

林荣根 《中国海洋湖沼学报》1994,12(2):106-113

The degradability of particulate organic matter(POM)in the Gironde Estuary(France)was measuredusing the incubation technique.The influence of sample treatment and incubation conditions on the re-sults was evaluated.A mathematical model was successfully used to describe the various degradationcurves.Results showed that the upstream POM had very high degradability;the central estuaryPOM had low degradability;and that the mouth POM degradability was between that of central POM(low degradability)and marine POM(high degradability).  相似文献   

Study on the mechanism of organic pollutant degradation in water by hybrid gas-liquid discharge     

《中国地球化学学报》2006,25(B08):131-131

  相似文献   

A Simple Method for Precise Determination of 23 Trace Elements in Granitic Rocks by ICP-MS after Lithium Tetraborate Fusion   总被引：1，自引：0，他引：1  

Shunsaku Awaji    Kentaro Nakamura  Tatsuo Nozaki  Yasuhiro Kato 《Resource Geology》2006,56(4):471-478

Abstract. An improved alkali fusion method followed by HF-HNO₃-HC1O₄ treatment is performed for simultaneous determination of 23 trace elements (Sr, Y, Zr, Nb, Ba, Hf, Ta, Th, U, and REE) by ICP-MS in rock reference materials: basaltic rocks (JB-2, JB-3) and granitic rocks (JG-la, JG-2, JG-3). Our improved method offers several advantages including: (1) suppression of whitish precipitates probably composed of insoluble fluorides by addition of HCIO4, (2) simple and reliable preparation procedure, (3) instrument calibration which enables straightforward simultaneous multi-elemental analysis, and (4) the very low background levels by using pure lithium tetraborate flux. We obtained the analytical results with a reproducibility of mostly <2 % (1) for the basaltic rocks and <7 % for the granitic rocks. The higher relative standard deviation (RSD) values for granitic rocks may be attributed to sample heterogeneity of coarse-grained granitic rocks. The analytical results of the granitic rocks demonstrate that Zr and Hf abundances are consistent with the compiled values and that REE concentrations agree well with recently published data, suggesting that the Li₂B₄O₇ fusion method applied in the present study is suitable for the analysis of the granitic rocks.  相似文献   

An assessment study of heavy metal distribution within soil in upper course of Zarqa River basin/Jordan   总被引：1，自引：0，他引：1  

Nabil Abderahman  Y. H. Abu-Rukah 《Environmental Geology》2006,49(8):1116-1124

Levels of heavy metals are found in soils and waters of the major tributary valleys of the Jordan Valley. Heavy metal content in soils irrigated by treated waste water were measured for a 40 km reach of Zarqa River. Soil samples from eight different sites along the upper course of this river were analyzed to determine the concentration of selected heavy metals (CO, Cr, Cu, Pb, Ni, Zn). Silt forms the major component of the soils with an average of 54%. Clay fractions show an increase with depth from 17 to 41%. Trends in particle size distribution and metal contents were compared across sample sites. Samples contained moderate to considerable levels of Pb and Ni. Concentrations of Cu and Cr ranged between 33–59 and 65–90 ppm, respectively. These values represent a slight to moderate class of pollution. The concentration of Cr shows a decrease with depth and distance from the waste water plant. Cu, Zn, and Ni show increasing concentrations with depth but Pb and CO do not. The concentrations of the measured heavy metals increases near the waste water treatment plant but decreases with distance from the plant due to precipitation in the stream bed and dilution with stream water. This decline in metal content with distance from the treatment plant suggests that most metals reaching floodplain soils may derive from the same source. Although current metal concentrations are low to moderate, floodplain surface soils in this area should be regarded as a potential source for future heavy metal pollution downstream.  相似文献   

Initial stages of effluent plume development, Kinloch water treatment plant (WTP), Kinloch, Taupo, New Zealand     

K. Dabell  C. Hendy  J. Hadfield  N. Kim 《Journal of Geochemical Exploration》2006,88(1-3):15

Studies of groundwater following changes to the wastewater treatment plant and disposal field at Kinloch (Taupo area, New Zealand) showed increases in chloride (Cl) after 5 months, followed by increased calcium (Ca) and magnesium (Mg) concentrations arising as a result of cation exchange with sodium (Na) and potassium (K). Sodium (Na) and potassium (K) showed only small increases after 12 months of initial discharge, while phosphorus (P) was still being totally adsorbed by ion exchange in the aquifer.  相似文献   

Investigation of mechanism of ultrasound on coal flotation     

Safak G. Ozkan  Halit Z. Kuyumcu 《International Journal of Mineral Processing》2006

Coal flotation studies were carried out in ultrasonically assisted flotation cells. Representative hard coal slime samples from Prosper-Haniel Coal Preparation Plant located in Bottrop, Ruhr Region of Germany were used for this purpose. A Wemco type flotation cell was fitted with transducers and tests were carried out at variable frequency and power. The reagent for coal flotation was Ekofol-440 with variable dosages during conventional and ultrasonic flotation experiments. The results showed that ultrasonic coal flotation yields more combustible recovery and lower ash values in concentrates than conventional flotation by using similar reagent dosages. These results are explained on the basis of efficient surface cleaning of the coal particles.  相似文献   

静压注浆在加固软土地基中的应用          下载免费PDF全文

赵海峰  韩利光 《探矿工程》2006,33(10):17-19

厂房的不均匀沉降是一种常见的工程事故，对于对沉降有特别要求的厂房，则必须加以处理。介绍了静压注浆法处理地基不均匀沉降的问题。实践证明，处理后的地基得到有效的加固。此工艺既简便、速度快，又经济。  相似文献   

洋山深水港区一期岩土工程     

钮建定  胡振明  陈智勇 《上海国土资源》2006,(4):30-34,29

上海国际航运中心洋山深水港区一期工程位于外海,为典型的远岸工程。该文介绍了码头区域桩基工程和陆域形成区域地基处理方面的主要岩土工程问题。  相似文献   

多年冻土热融滑塌的地温变化及滑坡过程分析     

马立峰  牛富俊  杨宁芳 《水文地质工程地质》2006,33(3):53-56,71

随着青藏高原工程强度的提高,冻土区斜坡稳定性成为工程建设必须面对和解决的问题,其中最为严重也是较难防治的斜坡失稳是热融滑塌.针对典型热融滑塌进行的温度监测资料表明,在滑塌的影响下,其下多年冻土地温年变化幅度趋小而年平均地温升高,导致产生这一现象的原因在于每年进入多年冻土的冷能有所降低.滑坡溯源侵蚀范围监测资料表明,滑塌范围的扩展随地温的周期变化波动进行,并主要集中在7～9月,最大扩展范围出现在沿坡体倾向方向.热融滑塌的产生与多年冻土条件和外因力的诱发关系密切,工程治理要考虑引起滑坡消亡的基本条件.  相似文献   

催化氧化糖蜜酒精废液催化剂的制备     

付全意  李坚斌  王彦玲  刘慧霞  扈胜禄 《矿产与地质》2006,20(3):313-316

根据内电解-催化氧化法的应用特点,选用颗粒活性炭作为催化剂的载体,采用浸渍法制备催化剂,并通过用不同催化剂对糖蜜酒精废液COD去除率的比较,确定最佳的催化剂制备条件:Cu(NO3)2浓度为7.5%,浸渍12h,260℃~300℃焙烧活化10~14h;多次使用后的Cu-AC催化剂由催化剂再生技术再生,并应用于糖蜜酒精废液处理。  相似文献