Evaluation of low-rank coals as raw material for Fe and Ca organomineral fertilizer using a new EDXRF method   总被引：2，自引：2，他引：0  

Konstantinos Chassapis  Maria Roulia 《International Journal of Coal Geology》2008,75(3):185-188

A rapid and reliable method for analyzing Fe and Ca in low-rank Greek coals was developed. The presence of Fe and Ca is of importance regarding the potential use of these coals as raw material for organomineral fertilizers. Samples were collected from the main Greek lignite deposits and standards were prepared using Atomic Absorption Spectroscopy (AAS), which were also employed in the Energy Dispersive X-ray Fluorescence (EDXRF) method. The new method offers the advantages of being timesaving, non-destructive and can be easily incorporated in a fertilizer production line. Analysis of low-rank Greek coals demonstrated a significant Fe and Ca content ranging from 0.15 to 1.97 wt.% for Fe and from 0.04 to 2.51 wt.% for Ca. When both EDXRF and AAS techniques were applied, the Fe and Ca concentration values differed less than 5%, demonstrating that both techniques are reliable for low-rank coals in the above concentration range. These EDXRF results may be used as a preliminary test regarding the application of Greek coals in organomineral fertilizer production, given that in these coals iron and calcium are the most abundant metals.  相似文献   

X射线荧光光谱法同时测定石灰石中主次痕量组分   总被引：4，自引：2，他引：2  

刘江斌  曹成东  赵峰  陈月源  谈建安  党亮  余宇 《岩矿测试》2008,27(2):149-150

采用熔融玻璃片和粉末压片法制样,选用标准样品,以经验α系数和散射线内标法校正元素谱线重叠干扰和基体效应,用ZSX PrimusⅡX射线荧光光谱仪对石灰石样品中CaO、Na2O、MgO、Al2O3、SiO2、K2O、TFe2O3、P2O5、TiO2、MnO和S等主次痕量组分进行测定,分析结果与标准值和化学值相符,12次测定的相对标准偏差小于10%。  相似文献   

X射线荧光光谱法测定生物样品中氯硫氮磷钾铜锌溴   总被引：4，自引：2，他引：2  

刘玉纯  梁述廷  徐厚玲  吴永斌 《岩矿测试》2008,27(1):41-44

研究了用微晶纤维素垫底镶边粉末压片制样-X射线荧光光谱测定生物样品中的Cl、S、N、P、K、Cu、Zn和Br的分析方法。重点研究了N的分析条件和校正方式,K、Cu和Zn的内标选定,测量次数对测定结果的影响。方法的检出限、精密度和准确度基本满足生物样品的分析要求。方法用于实际生物样品的测定,结果与化学法相符。  相似文献   

铝土矿中主成分的X射线荧光光谱分析   总被引：1，自引：1，他引：0  

钟代果 《岩矿测试》2008,27(1):71-73

利用X射线荧光光谱法测定铝土矿中主成分A l2O3、SiO2、Fe2O3、TiO2。采用四硼酸锂-偏硼酸锂作熔剂,溴化锂作脱模剂,国产高频熔样炉高温熔融制备玻璃圆片,以标准物质制作校准曲线进行测定,并与化学法进行对照,结果基本一致。方法操作简单、快速,准确度和精密度均达到国家标准方法规定的要求,已用于实际生产中。  相似文献   

斯里兰卡曼泰遗址出土青花瓷的化学成分分析及产地初探   总被引：2，自引：2，他引：0  

张茂林  贾兴和  毛振伟  朱铁权  王昌燧  黄宇营  何伟 《岩矿测试》2008,27(1):37-40

利用X射线荧光光谱、同步辐射X射线荧光光谱、中子活化、电感耦合等离子体原子发射光谱等多种技术手段分析了斯里兰卡曼泰遗址出土的7枚青花瓷残片的结构和成分。通过遗址出土部分青花瓷样品和中国各地瓷器样品的瓷胎元素含量聚类分析,初步判断其中的4枚青花瓷残片产自中国景德镇,而其余3枚样品的出处尚不能确定,需作进一步研究。  相似文献   

土壤及水中As价态分析方法研究   总被引：6，自引：0，他引：6       下载免费PDF全文

周康民  汤志云  肖灵  黄光明  江冶  高孝礼 《江苏地质》2008,32(3):189-197

建立了用原子荧光光谱仪测定水体中的砷及土壤中有效砷的价态分析方法。采用控制酸度的方法实现水中砷的价态分析。选用AB—DTPA为浸提剂提取土壤中的有效砷,经巯基棉吸附,分离五价砷和三价砷,实现有效砷的价态分析。方法快速简便,经济实用,可用于环境研究中的大批量样品分析。  相似文献   

Neutron Activation Analysis,Atomic Absorption and X‐Ray Fluorescence Spectrometry Review for 2006–2007     

L. Paul Bédard 《Geostandards and Geoanalytical Research》2008,32(4):399-403

These mature analytical techniques do not show any change in publication level from the previous two years and AAS remains dominant in terms of the number of publications. The last two years have seen fewer technical improvements than in the previous review period. Some interesting papers dealing with uncertainty and quality assurance in INAA were published during 2006–2007. It is suggested that photon activation should be reconsidered because the source of electron accelerators has recently improved. A technique to preconcentrate Se for INAA determination has also been proposed. In the case of AAS, papers on analyte preconcentration continue to be more abundant than those relating to instrumental modification. Sample preparation for AAS is also active and ultrasound‐assisted leaching shows some promising applications. There were an unusual number of reviews concerned with AAS and those important to geological samples are cited here. A technique to preconcentrate Cr in water is presented and a new device to determine As and Se is showing some potential uses. Confocal X‐ray mapping continues to show interesting developments. One group developed a technique to perform XRF inside an oyster and an interesting application of μ‐XRF mapping of sediments is presented. Determination of platinum‐group elements (at μg g¹ concentrations) can be carried out very quickly with an improved XRF technique.  相似文献   

微电流电解对铜绿微囊藻(Microcystis aeruginosa)叶绿素荧光特性的影响     

林莉  冯璁  李青云  吴敏  赵良元 《湖泊科学》2015,27(5):873-879

研究微电流电解不同电流密度下铜绿微囊藻(Microcystis aeruginosa)的叶绿素荧光参数变化,从藻类生理生态特征方面揭示电解抑藻的作用机理.结果表明:对于体积一定而初始细胞密度不同的铜绿微囊藻藻液,微电流电解抑藻存在相应的临界电流密度阈值,当电流密度阈值时,藻的生长得到完全抑制.当电流密度阈值时,藻的光系统Ⅱ受损,但经过6 d的培养其生理活性可恢复正常.若电流密度临界值,电解胁迫将超过藻的耐受能力,从培养的第2 d开始藻的光系统Ⅱ功能完全丧失.电解抑藻一方面是通过破坏光系统Ⅱ和捕光天线藻胆体之间的连接,使藻胆体无法继续向光系统Ⅱ传递光能;另一方面是通过破坏藻细胞光系统Ⅱ结构,使其无法进行光合作用,最终导致藻细胞的死亡.  相似文献   

鄂东南某铀矿勘查区地气与X荧光异常特征及找矿意义          下载免费PDF全文

张国亚  周四春  刘晓辉  刘俊  杨奎  朱剑 《高校地质学报》2014,20(4):564

采用地气与土壤X荧光（地球化学） 测量法,对鄂东南某铀矿勘查区开展隐伏铀矿找矿工作,结果表明铀矿赋存在 工作区主断裂和次级断裂中,在含矿断裂上方及断裂延伸方向的相邻区域形成含U的地气与土壤地球化学异常区。异常区 内Pb,Zn,Cu,Au的地气异常明显且具有一定的差异,同时伴有幅度较低的W,Bi,Y,Mo,Mn,As等元素组合异常。 根据勘查区获得的地气与土壤X荧光资料综合分析,在测区西北的次级断裂F7北部捕获的地气与土壤异常具有已知矿异常 的全部特征。依据地气异常位置与断裂的关系,推断铀矿可能埋深在200~350 m左右,矿体在走向上可能有220 m的延续。目 前,在该异常区布设的钻孔已在200 m深度见到铀矿体,进一步的探矿工程还在进行中。  相似文献   

Measuring natural phytoplankton fluorescence and biomass: a case study of algal bloom in the Pearl River estuary     

Zhao J  Cao W  Yang Y  Wang G  Zhou W  Sun Z 《Marine pollution bulletin》2008,56(10):1795-1801

A moored optical buoy was deployed in the Pearl River estuarine waters for a 15-day period. A four-day algal bloom event occurred during this study period. Both chlorophyll a concentration and algal cell density (a proxy for biomass) changed dramatically before and after the event. The chlorophyll concentration at a 2.3 m depth rose from 5.15 mg/m⁻³ at 15:00 h on August 19 to 23.62 mg/m⁻³ at 9:00 h on August 21, and then decreased to 3.24 mg/m⁻³ at 15:00 h on August 24. The corresponding cell density ranged from 1.57 × 10⁵ to 1.76 × 10⁶ cells/L. We used normalized fluorescence line height (NFLH) and normalized fluorescence intensity (NFI) in order to determine fluorescence activity. Combined with the in situ sampling dataset, we were able to correlate natural fluorescence (NFLH and NFI) with chlorophyll a concentrations, and found correlation coefficients of 0.72 and 0.75, respectively. We also found correlations between natural fluorescence and cell density, with correlation coefficients of 0.71 and 0.65, respectively. These results indicate that applying continuous time series of natural fluorescence can reflect changes in biomass. This technique will prove extremely useful for in situ and real-time observations using an optical buoy. Although there are still problems to solve in the real-time observation of natural fluorescence in algal bloom events, we discuss the primary factors affecting fluorescence signals and suggest possible methods for mitigating these issues.  相似文献