P204萃取分离——ICP／AES法测定CeO2标准物质中La,Pr,Nd,Sm,Gd和Y

本文采用ＨＮＯ３和Ｈ２Ｏ２溶解试样，在８ｍｏｌ／ＬＨＮＯ３介质中，以溴酸钾将Ｃｅ（Ⅱ）氧化成Ｃｅ（Ⅳ）继以Ｐ２０４／ＣＣｌ４萃取Ｃｅ（Ⅳ），将三价稀土元素与四个铈分离，用ＩＣＰ－ＡＥＳ法测定ＣｅＯ２标准物质中Ｌａ，Ｐｒ，Ｎｄ，Ｓｍ，Ｇｄ和Ｙ，分析结果均落在标准值的置信区间内ＲＳＤ〈６％。     

P_（204）萃取分离──ICP／AES法测定CeO_2标准物质中La、Pr、Nd、Sm、Gd和Y

本文采用ＨＮＯ３和Ｈ２Ｏ２溶解试样，在８ｍｏｌ／ＬＨＮＯ３介质中，以溴酸钾将Ｃｅ（Ⅲ）氧化成Ｃｅ（Ⅳ），继以Ｐ２０４／ＣＣｌ４萃取Ｃｅ（Ⅳ），将三价稀土元素与四价铈分离，用ＩＣＰ－ＡＥＳ法测定ＣｅＯ２标准物质中Ｌａ、Ｐｒ、Ｎｄ、Ｓｍ、Ｇｄ和Ｙ，分析结果均落在标准值的置信区间内，ＲＳＤ＜６％。     

Study on Electrolytes (CeO_2 )_( 0.7-x) (MO) _x (La_2O_3)_(0.3)(M=Mg,Ca, Sr)

ＳｔｕｄｙｏｎＥｌｅｃｔｒｏｌｙｔｅｓ（ＣｅＯ_２）_（０．７－ｘ）（ＭＯ）_ｘ（Ｌａ_２Ｏ_３）_（０．３）（Ｍ＝Ｍｇ，Ｃａ，Ｓｒ）ＣｈｅｎＧｕａｎｇｙｕ（陈广玉），ＬｉｕＪｉａｎｇ（刘江），ＨｅＬａｎｙｉｎｇ（何岚鹰），ＳｕＷｅｎｈｕｉ（苏文辉），Ｈｕ...     

镧系元素高氯酸盐苯丁基亚砜配合物的合成与表征

本文以稀土高氯酸盐ＲＥ（ＣｌＯ_４）_３ｎＨ_２Ｏ（ＲＥ＝Ｌａ~（３＋）、Ｃｅ~（３＋）、Ｐｒ~（３＋）、Ｎｄ~（３－）、Ｓｍ~（３－）、Ｅｕ（３＋），ｎ＝６～７）与苯丁基亚砜ＰＢＳＯ（Ｃ_６Ｈ_５Ｃ_４Ｈ_９）在无水乙醇体系中合成出六个新配合物，并对配合物进行了元素分析，稀土离子含量测定，配体ＰＢＳＯ含量测定ＣｌＯ_４~－含量测定、ＩＲ谱、导电、ＴＧ－ＤＴＡ分析及Ｘ－射线粉末衍射。确定了配合物的组成为［ＲＥ（ＢＰＳＯ）_７（ＣｌＯ_４）］（ＣｌＯ_４）_２，配位数为８，电解质类型为１：２。     

氧化钇标准物质中CeO_2，Pr_6O_（11），Dy_2O_3，PbO，NiO

氧化钇标准物质中ＣｅＯ_２，Ｐｒ_６Ｏ_（１１），Ｄｙ_２Ｏ_３，ＰｂＯ，ＮｉＯ，ＣａＯ的ＩＣＰ－ＡＥＳ测定江瑞源（福建省测试技术研究所，福州，３５０００３）高纯稀土中杂质测定有控制气氛电弧法、色层分离电弧法及ＩＣＰ－ＡＥＳ法等。而ＩＣＰ－ＡＥＳ法对高纯?..     

多组分硫酸体系P507萃取分离铈(Ⅳ)工艺

本文对２－乙基己基膦酸单２－乙基己基酯（Ｐ５０７）从含有Ｃａ２＋、Ｆｅ３＋、Ｆ－、ＰＯ３－４、Ｔｈ４＋、Ａｌ３＋、Ｍｎ２＋的多组分硫酸稀土溶液中一步萃取分离铈（Ⅳ）工艺进行研究,得到纯度≥９９．９％的氧化铈产品及少铈碳酸稀土产品（ＣｅＯ２／ＲＥＯ≤３％）。     

Determination of Trace Amount of Vanadium in High Purity Y_2O_3 by Electrothermal Vaporization－ICP－AES With Bi（PDC）_3 Coprecipitation

ＤｅｔｅｒｍｉｎａｔｉｏｎｏｆＴｒａｃｅＡｍｏｕｎｔｏｆＶａｎａｄｉｕｍｉｎＨｉｇｈＰｕｒｉｔｙＹ_２Ｏ_３ｂｙＥｌｅｃｔｒｏｔｈｅｒｍａｌＶａｐｏｒｉｚａｔｉｏｎ－ＩＣＰ－ＡＥＳｗｉｔｈＢｉ（ＰＤＣ）_３ＣｏｐｒｅｃｉｐｉｔａｔｉｏｎＨｕＢｉｎ；Ｙａ?..     

钢包炉（LF）CaO－SiO_2－MgO－Al_2O_3渣系的脱硫试验

钢包炉（ＬＦ）ＣａＯ－ＳｉＯ_２－ＭｇＯ－Ａｌ_２Ｏ_３渣系的脱硫试验郭上型，万真雅（华东冶金学院，马鞍山２４３００２）ＤｅｓｕｌｐｈｕｒｉｚｉｎｇＴｅｓｔｕｓｉｎｇＣａＯ－ＳｉＯ_２－ＭｇＯ－Ａｌ_２Ｏ_３ＳｌａｇｉｎＡＬａｄｌｅＦｕｒｎａｃｅ￥ＧｕｏＳ...     

铬精矿、铬铁矿及高碳铬铁中氧化锰、氧化铬的连续测定

铬精矿及铬铁矿在钢铁工业中主要作为冶炼铬铁和制造耐火砖的材料,其中ＭｎＯ和Ｃｒ_２Ｏ_３是必不可少的分析项目。本文提出了连续测定ＭｎＯ及Ｃｒ_２Ｏ_３含量的方法,以瓷坩埚代替镍坩埚,采用Ｎａ_２Ｏ_２熔融试样,直接氧化了Ｍｎ（Ⅱ）与Ｃｒ（Ⅲ）,同时分离出锰,在一定的酸度范围内测定ＭｎＯ的含量,调整滤液酸度,测定Ｃｒ_２Ｏ_３的含量。１实验部分１．１主要试剂Ｎａ_２Ｏ_２（固体）;无水Ｎａ_２ＣＯ_３（固体）;Ｎａ_２ＣＯ_３洗液：２％水溶液;硫磷混酸：１６０ｍＬ浓Ｈ_２ＳＯ_４及８０ｍＬ浓Ｈ_３ＰＯ_４小心缓慢加入…     

Eu~（3＋） Ion as Luminescent Probe：Eu~（3＋） Sites in Eu（PBI）_3·phen and ［Eu（PBI）_3·C_2H_5OH·H_2O］·H_2O Complexes

Ｅｕ~（３＋）ＩｏｎａｓＬｕｍｉｎｅｓｃｅｎｔＰｒｏｂｅ：Ｅｕ~（３＋）ＳｉｔｅｓｉｎＥｕ（ＰＢＩ）_３·ｐｈｅｎａｎｄ［Ｅｕ（ＰＢＩ）_３·Ｃ_２Ｈ_５ＯＨ·Ｈ_２Ｏ］·Ｈ_２ＯＣｏｍｐｌｅｘｅｓ￥ＪｉｎＬｉｎｐｅｉ（金林培）（ＤｅｐａｒｔｍｅｎｔｏｆＣｈ...     

ICP-AES法测定铍铜合金中Be, Ni, Ti, Co, Fe, Al, Si, Mg和Pb

通过操作条件的试验研究，用基体匹配法校正基体干扰，并选择了最佳工作条件。样品加标回收率为96％～110％，方法快速、简便、可靠，适用于铍铜合金的快速检验。     

铂饰品中Pt, Pd, Au, Ag, Cu, Ni, Zn, Fe的测定

试验研究建立了同一试料溶液连续、同时测定铂饰品中各成分的分析方法。主体Pt以氯铂酸铵称量法及火焰原子吸收光谱(FAAS)法或电感耦合等离子发射光谱(ICP-AES)法测定滤液中残留Pt进行补差而测定。主成分Pd,Au,Ag,Cu和焊料成分Ni,Zn,Fe以FAAS法或ICP-AES法测定。其方法回收率分别为:Pt99.9%~100%;Pd99.3%~99.7%;Au99.5%~l01.5%;Ag98.0%~100%;Cu97.7%~99.3%;Zn98.0%~99.0%;Ni94.0%~105%;Fe95.0%~99.0%。实际试样分析时,各成分质量分数之和一般在99.12%~l01.2%之间,接近于100%,间接说明方法的可靠性。本法适用于Pt-Pd二元体系和Pt-Pd-Au-Cu多元复杂体系的铂饰品的破坏分析,可用于校正X荧光光谱法无损检测铂饰品的分析结果。     

稀土金属中14种非稀土杂质的ICP-MS法同时测定

本文研究了用 ICP- MS仪器同时测定稀土金属中 Mg、Al、Ti、Cr、Mo、Mn、Co、Ni、Cu、Zn、Pb、W、Nb、Ta等 14种非稀土杂质。研究了各稀土基体对被分析元素的基体效应 ,选择了相匹配的内标元素。比较了标准曲线法与标准加入法的测定结果。确定了用内标元素校正基体效应及仪器漂移 ,以标准曲线法直接测定。进行了加料回收和精密度实验 ,回收率在 94%～ 113%之间 ,RSD<10 %。被分析元素的检出限为 0 .0 1～ 0 .2 0 ng/ m L,测定下限为1～ 2 0 μg/ g。     

原子荧光光谱法测定土壤中的铅、铬、镉、汞、砷、锌、铜、镍等元素研究

土壤无机污染物铅、铬、镉、汞、砷、锌、铜、镍这八大重金属,是一般土壤检测中的必检项目。金属元素在土壤中积累富集后,有可能通过雨水迁移,造成地下水,地表水污染,或者通过农作物进入食物链,进而影响食品安全和人体健康,因此,对这些元素的检测显得尤为重要。本文采用原子荧光光谱法对土壤中的金属元素进行测量,同时结合微波消解技术对样品进行处理,确保测量数据的准确性。     

Regional mapping panels for chromosomes 3, 4, 5, 11, 15, 17, 18, and X

The erm family of 23S rRNA adenine-N6-methyltransferases confers resistance to all macrolide-lincosamide-streptograminB (MLS) antibiotics, but not all MLS antibiotics induce synthesis of Erm methyltransferase with equal efficiency in a given organism. The induction efficiency of a test panel of MLS antibiotics was studied by using two translational attenuator-lac reporter gene fusion constructs, one based on ermSV from Streptomyces viridochromogenes NRRL 2860 and the other based on ermC from Staphylococcus aureus RN2442. Four types of responses which were correlated with the macrolide ring size were seen, as follows: group 1, both ermSV and ermC were induced by the 14-membered-ring macrolides erythromycin, lankamycin, and matromycin, as well as by the lincosamide celesticetin; group 2, neither ermSV nor ermC was induced by the 12-membered-ring macrolide methymycin or by the lincosamide lincomycin or the streptogramin type B antibiotic ostreogrycin B; group 3, ermSV was selectively induced over ermC by the 16-membered-ring macrolides carbomycin, chalcomycin, cirramycin, kitasamycin, maridomycin, and tylosin; and group 4, ermC was selectively induced over ermSV by the 14-membered-ring macrolide megalomicin. These data suggest that the leader peptide determines the specificity of induction by different classes of MLS antibiotics and that for a given attenuator, a major factor which determines whether a given macrolide induces resistance is its size.     

Increased-contrast, high-spatial-resolution, diffusion-weighted, spin-echo, echo-planar imaging

An insertable head gradient coil with a maximum gradient amplitude of 45 mT/m and a rise time of 150 musec along all three major axes was used to collect high-spatial-resolution, single-shot, spin-echo, echo-planar, diffusion-weighted magnetic resonance images with b values ranging from 0 to 2,200 sec/mm2. Improvements in spatial resolution allowed better visualization of large white matter tracts and their relation to adjacent anatomic structures. Excellent contrast and anatomic detail were revealed for most structures in the brain when a sufficient number of acquisitions were collected.     

Susceptibilities of non-Pseudomonas aeruginosa gram-negative nonfermentative rods to ciprofloxacin, ofloxacin, levofloxacin, D-ofloxacin, sparfloxacin, ceftazidime, piperacillin, piperacillin-tazobactam, trimethoprim-sulfamethoxazole, and imipenem

Agar dilution MICs of 10 agents against 410 non-Pseudomonas aeruginosa gram-negative nonfermentative rods were determined. MICs at which 50 and 90% of the isolates were inhibited, respectively, were as follows (in micrograms per milliliter): sparfloxacin, 0.5 and 8.0; levofloxacin, 1.0 and 8.0; ciprofloxacin, 2.0 and 32.0; ofloxacin, 2.0 and 32.0; D-ofloxacin, 32.0 and > 64.0; ceftazidime, 8.0 and 64.0; piperacillin with or without tazobactam, 16.0 and > 64.0; trimethoprim-sulfamethoxazole, 0.5 and > 64.0; imipenem, 2.0 and > 64.0. With the exception of those for Stenotrophomonas maltophilia, Burkholderia cepacia, and Alcaligenes faecalis-A. odorans, agar dilution MICs for all strains tested were within 1 dilution of inhibitory (bacteriostatic) levels as determined by time-kill methodology.     

电感耦合等离子体原子发射光谱法测定镍基合金中钨、钼、钴、铝、钛、铌、铁元素

针对镍基合金的溶解方法、元素分析谱线的选择、仪器分析参数的优化、内标溶液的选用、基体元素的影响、干扰元素的校正及消除方法等进行了研究,确定了最佳试验条件;试验结果表明:检出限为0.024mg/L～0.85mg/L;加标回收率为97.1%～105.7%;方法的精密度(RSD,n=11)小于1.0%,本试验测定结果与标钢认定值和湿法分析结果做对照,都在允许偏差范围内,表明此方法精密度好,准确度高。