原子荧光法测定药用玻璃瓶中砷含量的研究

探讨利用原子荧光法测定药用玻璃瓶中砷的含量,建立药用包装材料中砷含量的新型检测方法。药用玻璃瓶经5%盐酸溶液、98℃蒸煮2 h后,用硫脲-抗坏血酸作为混合还原剂将浸提液中的五价砷还原为三价砷,再与硼氢化钾反应生成砷化氢气体,载入原子荧光光度计,通过测定不同浓度的砷标准溶液,制作标准曲线,从而测定样品中的砷含量。本方法线性范围为0～20μg.L-1,相关系数r为0.992。两批药用玻璃瓶的砷含量均低于国家标准规定的限度(0.2 mg.L-1)。原子荧光法简便快速、灵敏度高、准确度好,优于传统的化学检测方法,适用于药品包装材料中砷含量的测定。     

氢化物发生原子荧光法测定中药中的砷

中药中砷元素含量过高会直接影响人体的健康,所以对中药中砷元素的测定具有重要的意义.砷的常规测定方法有比色法,分光光度法[1,2],极谱法[3],原子吸收法[4]等,本文研究了氢化物发生—原子荧光法测定中药中砷元素的方法,方法检出限为0.10ug/L,线性检测范围为0～10ug/L.     

外束PIXE检测头发中砷的含量

质子X荧光分析技术(PIXE)作为微量元素分析工具,已有了很大的发展.复旦大学静电加速器实验室已将质子束从真空中引出作外束PIXE分析~[2].由于这个方法灵敏度高,快速简便,且是非破坏性的,因此,得到广泛应用.本文介绍用PIXE方法与氢化法——原子吸收光谱法共同检测头发中砷含量.经测定,头发中砷含量为～10ppm.     

流动注射氢化物原子吸收法测定山茱萸中的汞、铅、砷

利用流动注射氢化物原子吸收法,测定了陕西省汉中市山茱萸成品中汞、铅、砷三种元素的含量。所测四种产品的汞含量在0.04～0.06 mg/kg之间,平均回收率为101.0,RSD为4.14;铅的含量在0.151～0.190mg/kg之间,回收率为100.8,RSD为1.63;砷的含量在0.015～0.016mg/kg之间,回收率为100.4,RSD为1.14。山莱萸中汞、铅、砷含量有个体差异,但含量都远低于《药用植物及药用试剂出口绿色行业标准》。     

电感耦合等离子体发射光谱法测定面粉中多种元素

本文介绍了用ICP—AES同时测定面粉中多种微量元素的方法,并比较了英、美、中三国三种面粉中多种微量元素的含量。     

含铁吸附、絮凝剂在水资源砷污染治理中的应用进展

针对当前日益严重的内陆水资源砷污染问题,介绍了砷污染的来源、现状、特点及各种除砷方法的优缺点,然后主要以铁盐絮凝法对阳宗海砷污染的治理工程和土壤固砷法对大屯海砷污染的治理工程为例,介绍不同类型的含铁吸附、絮凝剂在天然水、地下水、饮用水及工业污水等领域的除砷净水工艺条件及其应用前景,并指出三氯化铁絮凝剂处理法是适合水资源砷污染治理行之有效的工程除砷方法.     

重庆道地黄连、青蒿的重金属含量研究

目的:通过对重庆道地产黄连、青蒿的重金属含量进行分析与评价,为这两味药材的质量研究提供参考.方法:对所采集的重庆道地黄连、青蒿的铅、镉(原子吸收法)以及砷(原子荧光法)进行测定、分析.结果:黄连样品铅、镉、砷平均含量分别为0.208 1,0.072 1和0.951 6 mg/kg.青蒿样品铅、镉、砷平均含量分别为0.500 0,0.068 7和1.1980 mg/kg.结论:所测定黄连、青蒿药材的重金属含量符合国家《绿色药用植物及制剂》相应标准.     

西藏沙棘果实Vc含量的测定及质量安全评价

目的:对西藏沙棘果实的Vc含量及铅、砷含量等进行测定,评价其安全性.方法:电位滴定法测定样品总酸度;阿贝折光仪测定样品的固形物含量;淀粉为指示液,碘滴定液测定Vc含量;原子吸收光谱法测定铅含量;原子荧光光度计测定砷含量.结果:西藏沙棘果汁中Vc含量为170mg/100g;总酸含量为2.82%;固形物含量为7.75%;铅含量为0.01mg/kg,砷含量为0.03mg/kg.结论:西藏沙棘果实中Vc含量≥170mg/100g.铅、砷含量符合中国药典规定的安全标准.     

湿法制磷酸废水中的有毒砷的消减

采用物理吸附、光催化及化学絮凝三种方法对宜昌一化工有限公司湿法制磷酸中含As废水(砷含量为13.56mg/L)进行了消减研究,三种方法中:物理吸附法活性炭的饱和吸附含量是1.0 g/50mL,此时废水84.4%的As被吸附除去,黏土的吸附试验中未发现吸附饱和现象;化学氧化法中,Fenton试剂最佳浓度比为[H2O2]∶[Fe3+]=200∶1,此时可以将82.2%的As3+氧化为低毒的As5+;化学絮凝法中,絮凝剂-96、絮凝剂-98及硅藻土三种絮凝剂作用的最佳pH分别为12.6、12.6、11.8,絮凝剂的最佳用量分别为10、9、13.0 mg/mL对废水中As3+转化率分别为65.7%、73.2%、76.3%.设计了含As废水处理装置,经处理后废水中As的含量达到国家工业废水排放标准.     

重庆道地金银花中的重金属含量研究

目的:对重庆道地药材金银花的重金属含量进行分析评价,为制定金银花药材重金属含量质量标准提供参考依据.方法:对重庆主产区不同年份、不同品种金银花药材样品的铅、镉、铜含量(石墨炉原子吸收分光光度法)及汞、砷含量(原子荧光法)进行分析.结果:铅的含量为0.158～1.564 mg/kg;镉的含量为0.009～0.069 mg/kg;汞的含量为0.010～0.078 mg/kg;铜的含量为0.162～0.364 mg/kg;砷的含量为0.457～2.172 mg/kg.不同产地、不同品种间铅和砷的差异性较大.结论:金银花药材基本上达到了<药用植物及制剂进出口绿色行业标准>相应的重金属限量标准,可进行规模化种植.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.