Geochemical characteristics of major and trace elements in Sahinali Coals,Aydin, Turkey

In this study, geochemical behavior of elements is investigated in 25 coal samples collected at 10 locations of ?ahinli coaliferous units at southeast of Ayd?n, Turkey. In all the samples, X-ray powder diffraction and inductively coupled plasma mass spectrometry analyses were performed and element and mineral compositions were determined. Total organic carbon (TOC) values of coals are between 14.6 and 37.7 wt% with average of 28.5 wt%. Samples are composed of quartz, calcite, feldspar, dolomite, mica, gypsum, and salt minerals which are accompanied by illite-, kaolinite-, and smectite-type clay minerals. Comparison of average element contents of world coals and studied samples yields that K > Fe > As > U > Cs > Y > Er > Al > Th > Rb > Yb > W > Tb > Dy > Lu > Ce > Sm > La > Ho > Si > Nd > Gd > Tm > Eu > Nb > Pr > Pb > Sn > Ni > Cu > Ga > Ta > Sb > Zr > Cd > V > Zn > Co > Mo > P > Hf > Ba are found to be enriched, while Mn > Be > Ca > Sr > Bi > Mg are found to be depleted. Statistically elements are correlated with TOC.     

Adsorption Equilibrium Parameters of Trace Impurities

Abstract

Atmospheric air contains various trace impurities which include oxides of nitrogen, carbon, sulphur, and light hydrocarbons. Prior to cryogenic distillation of air to produce oxygen, nitrogen, and argon, these trace impurities have to be removed since many of these compounds constitute a safety hazard in the plant. In this study, adsorption has been considered for their removal and adsorption behavior of ethylene, acetylene, nitrous oxide, acetonitrile, methyl tert-butyl ether, methyl sulfoxide, dimethyl sulfoxide, and methanol have been studied in the Henry's Law low concentration region with several different adsorbents. Adsorption equilibrium parameters have been determined with samples of Alcan pure alumina, Alcan alumina/13X composites Actiguard 600/650PC, CABSORB Chabazite, Ceca13X, and Clinoptilolite by using the concentration pulse chromatographic technique. Heat of adsorption values and van't Hoff plots have been presented.     

Determination of toxic and essential elements in sunflower honey from Thrace Region,Turkey

The aim of this study was to determine the levels of copper (Cu), manganese (Mn), zinc (Zn), iron (Fe), cadmium (Cd), lead (Pb), chromium (Cr), nickel (Ni) and selenium (Se) in sunflower honeys obtained from Thrace Region of Turkey. Trace and toxic element determination was performed by atomic absorption spectrometry after microwave digestion. The accuracy of the method was checked by the standard reference material, NIST‐SRM 1515 Apple leaves. The maximum contents of trace and toxic elements in honey samples from Kesan (polluted area) were found as 0.46, 0.82, 1.98, 14.0, 9.86 μg kg^?1, 0.48 mg kg^?1, 137, 115 and 290 μg kg^?1 for Cu, Mn, Zn, Fe, Cd, Pb, Cr, Ni and Se, respectively.     

The geochemistry of trace elements in marine oil shales and their combustion residues: Occurrence and environmental aspects

With the aim of better understanding geochemistry of trace elements in marine oil shale and its combustion residues, 23 raw samples, 17 oil shale combustion residues, and 18 selected minerals from Bilong Co oil shale are studied. Potentially hazardous trace elements in raw samples include As, B, Cd, Mo, and Se, while Se, Mo, Cd, As, Bi, and U are potentially hazardous trace elements in combustion residues. As is controlled mainly by Fe-bearing minerals. B occurs mainly in clay minerals. Cd is enriched mainly in calcite. Mo is controlled mainly by organic matter. Se is mainly controlled by P-bearing minerals.     

电感耦合等离子体质谱法(ICP-Mass)同时测定菊花中多种微量元素

用原子吸收光谱法(AAS)和电感耦合等离子体质谱法(ICP-Mass)分别测定菊花中微量元素锌、铜、铁,采用的定量分析方法是标准曲线法。并对两种仪器分析方法所得结果进行了比较。结果表明,随锌、铜、铁变量,AAS法和ICP-Mass法均有较好的线性关系,且测定的结果相近。两种方法最低检出限量分别为,AAS法铁0.4mg/L、铜0.4mg/L、锌0.08mg/L;ICP-Mass法铁0.0008mg/L、铜0.0008mg/L、锌0.0008mg/L。与AAS法技术相比,ICP-Mass技术将ICP的高温电离特性与四极杆质谱计的灵敏快速扫描的优点相结合,ICP-MS技术提供了最低的检出限,最宽的动态线性范围,且谱线简单、干扰少,分析精密度高,所以ICP-Mass法的准确度更高。ICP-Mass法可以同时测定菊花中的多种微量元素,分析周期短,提高了样品的分析效率。显示该方法快速、准确、简便等的优点。而AAS法一次只能分析单个元素。     

厌氧生化处理技术深度除铜的试验研究及工程应用

通过对重金属废水的前期试验研究结果[1],采用厌氧生化技术针对重金属废水痕量铜的试验研究,试验结果显示当原水痕量铜离子浓度低于2.5 mg/L时,经过厌氧生化处理后铜离子浓度低于0.3 mg/L。推广到实际工程应用,结果证明,该技术应用非常成功,从2013年起至今,工程运行结果稳定,运行费用低,当原水铜浓度低于2.0 mg/L时,出水铜离子浓度可以达到《电镀污染物排放标准》(GB 21900-2008)水污染物排放标准表3标准,即低于0.3 mg/L,该技术具有处理效率高,难受冲击负荷高,应用范围广,处理成本低等优点,具有非常大的实际推广意义。     

大红袍花椒中微量元素的分析测定

采用4∶1的硝酸和高氯酸的混酸体系作为消化液进行样品消解,火焰原子吸收分光光度法(AAS)测定了陕西韩城大红袍花椒中四种微量元素的含量。结果表明,大红袍花椒中Fe,Mn含量丰富,Zn,Cu含量较少。     

Parametric models of local search progression

Algorithms that search for good solutions to optimization problems present a trace of current best objective values over time. We describe an empirical study of parametric models of this progression that are both interesting as ways to characterize the search progression compactly and useful as means of predicting search behavior. In our computational experiments, we give examples of a variety of problems and algorithms where we are able to use the parametric models to make predictions of performance that cross instances and instance sizes.     

大型剧院火灾自动报警系统设计

结合大型剧院火灾自动报警系统工程设计实例,分析、比较剧院入口大厅、观众厅及舞台区域高大空间火灾探测器的选择,阐述在高大开放式空间建筑中怎样合理地选择火灾探测器。     

Pollutant concentrations and fluxes in both stormwater and wastewater at the outlet of two urban watersheds in Nantes (France)

A two-year study of pollutants in both the stormwater and wastewater of urban watersheds has been conducted in Nantes (France). The present paper discusses the characteristics of pollutants transported by stormwater and wastewater collection networks in two urban watersheds. A physicochemical characterisation of the effluents was performed, along with an estimation of pollutant fluxes discharged into the Gohards River. Suspended solids (SS), trace metals, polycyclic aromatic hydrocarbons (PAHs) and pesticides were studied. SS, Zn, Cu and glyphosate were the main pollutants in stormwater and wastewater. In the watersheds examined, the pyrolitic origin of PAHs (mainly from traffic) was determined through ratios, with fluoranthene and pyrene being predominant. Despite a reduction in the use of pesticides in Nantes Metropolitan area, herbicides containing glyphosate were still detected in stormwater. It should be noted that this herbicide is widely used by homeowners, a fact that may explain its occurrence in stormwater.