X射线衍射法定量分析蓝晶石样品

提出了应用X射线衍射法定量分析蓝晶石样品。将粒径10～15μm的蓝晶石粉末置于模具中,制成厚度为0.2mm的样片。取经提纯的蓝晶石和纯石英,按不同比例配成11个校准样品用于制作工作曲线,每一样品中加入相同量的刚玉作为内标以校正基体干扰。方法用于蓝晶石地质样品分析,所得测定结果与理论值相符。     

Si内标-X射线衍射法定量测定铁矿中Fe3O4、Fe2O3和SiO2

铁矿物相的准确定量对矿物价值评价及选冶工艺研究有重要作用,现有化学法流程复杂效率低,X射线衍射全谱拟合法可溯源性差,结果准确性难以评价和验证。本研究建立了以Si为内标,以Cu靶X射线为辐射光源,步进扫描方式获得衍射谱图,以待测相含量为横坐标,待测相与内标相峰面积比值为纵坐标建立校准曲线,以曲线对铁矿中Fe3O4、Fe2O3和SiO2物相进行定量的方法。试验对制样条件、扫描参数、内标物选择、积分方式、重叠峰校正等进行了优化选择,结果表明,试样全部通过45 μm标准筛,Si内标比例为10%,步进长度0.01°,步进时间30S,选择对Fe3O4（311）、Fe2O3（104）、SiO2（011）和Si（111）的衍射峰进行积分强度计算,可获得最优结果。在选定工作条件下,Fe3O4在1.07～100%范围内线性相关系数(R2)为0.9953,相对标准偏差(RSD)1.1%～13.2% (n=6),加标回收率99.7 %~114.8 %,检出限(LOD)4.29%;Fe2O3在1.51～100%范围内线性相关系数(R2)为0.9991,相对标准偏差(RSD)2.8%～10.6% (n=6),加标回收率87.1%~112.2%,检出限(LOD)2.56%;SiO2在0.79～29.72 %范围内线性相关系数(R2)为0.9957,相对标准偏差(RSD)3.2%～10.3% (n=6),加标回收率86.6%~98.9%,检出限(LOD)0.68%。方法易溯源、准确性易评价和验证,适合开展标准化检测和应用。     

X射线衍射法(XRD)分析煅烧白云石的物相组成

采用X射线衍射技术(XRD)对白云石原矿和不同温度煅烧的白云石原矿进行了物相分析,白云石原矿中主相为CaMg(CO3)2,相对含量约为98.6%,杂质相为SiO2,相对含量约为1.4%。白云石原矿经过300和500℃,煅烧2h未见主相CaMg(CO3)2分解,在750℃煅烧2h,主相CaMg(CO3)2部分分解为碳酸钙和氧化镁,在1000℃煅烧2hCaMg(CO3)2全部分解为氧化镁和氧化钙。     

电感耦合等离子体原子发射光谱法(ICP-OES)测定含钒尾渣中钒的含量

以氢氟酸、硝酸消解样品,然后加入硫酸络合钛避免其在低酸度介质中水解,并且加热至产生三氧化硫烟以驱赶氢氟酸,以水稀释定容后采用电感耦合等离子体原子发射光谱法（ICP-OES）直接测定含钒尾渣中钒的含量。实验考察了在共存含有铁、钛、铝、铬、锰、钒等元素的含钒尾渣复杂基体中,基体效应、光谱干扰以及背景噪音等影响因素对钒测定的干扰,方法通过优选元素分析谱线、背景校正区域以及光谱仪工作条件,并且采用基体匹配法和同步背景校正法相结合的方式,消除了构成复杂且变化无常的样品基体对测定的影响。结果表明,方法可用于测定0.01%~6.0%的钒,并且样品基体在含20%~40%铁,5%~30%钛时,铝、铬、锰、钠、硅、钙、镁各元素1%~10%的变化对测定无影响,检测下限可达0.0009%;精密度RSD〈3%,加标回收率94%~106%,与高锰酸钾氧化-硫酸亚铁铵滴定化学分析法的测定结果对照一致。     

电感耦合等离子体原子发射光谱法(ICP-AES)测定铜阳极泥和分银渣中锡、碲的含量

建立了氢氧化钾、硝酸钾熔融,在氨水-氯化铵介质中用氢氧化铁共沉淀分离和富集锡、碲后,在标准系列中加入铁进行基体匹配,用电感耦合等离子体原子发射光谱法(ICP-AES)测定铜阳极泥和分银渣中锡、碲含量的方法。对测定锡、碲的条件及共存元素的干扰情况进行了研究,锡、碲的检出限分别为0.0012、0.024μg/mL;加标回收率为98.0%～100.3%、99.0%～102.0%;相对标准偏差为2.4%～6.6%、1.3%～7.0%。方法简单快速,易于掌握。测定元素的含量范围为0.02%～5.0%。     

水基多组分体系中新戊二醇的定量分析

新戊二醇(NPG)分子结构中含有两个对称的伯羟基易于快速参与酯化、缩合和氧化等多种化学反应.而β位置上没有氢原子的特定新戊基结构使其具有很高的化学稳定性和热稳定性,也使其衍生物具有优异性能.新戊二醇主要用于生产饱和聚酯树脂,其衍生物广泛用于涂料、汽车、纺织、制药等领域.     

用FTIR定量测定聚对苯二甲酸乙二酯晶区和非晶区反式构象含量

用傅里叶变换红外分光光度计测定不同条件下退火处理的聚对苯二甲酸乙二酯膜的谱图, 用谱带分离技术对归属于反式构象的1340cm^-^1谱带进行阻尼最小两乘分峰处理, 结合属左右式构象贡献的1454cm^-^1谱带, 用线性回归分析的方法获得晶区反式构象、非晶区反式构象、非晶区左右式构象的百分含量。     

Utility of copper(II) oxide as a packed reactor in flow injection assembly for rapid analysis of some angiotensin converting enzyme inhibitors

A new simple, sensitive, rapid and precise flow injection (FI) procedure based on the formation of copper complexes with some angiotensin converting enzyme (ACE) inhibitors has been developed and evaluated for the analysis of lisinopril (LN), enalapril maleate (EP), ramipril (RP) and perindopril tert-butylamine (PD). In this method, samples were injected into a flowing stream of distilled-deionized water, carried through the packed reactor of CuO for derivatization followed by ultraviolet (UV) detection. The flow rate was 1.5 ml min⁻¹ and column temperature was ambient (25 °C). Lisinopril was injected directly into the flowing stream and the detector response was measured at 262 nm. The hydrolysis products of enalapril maleate, ramipril and perindopril tert-butylamine in 0.2N NaOH were injected after neutralization with 1N HCl and the detector response was measured at 272, 265 and 252 nm, respectively. The developed method was successfully applied to the determination of tested drugs in pharmaceutical preparations at a sampling rate of 60 samples h⁻¹ and a recovery near 100% for all compounds.     

Quantitative analysis of W-C:H coatings by EPMA,RBS (ERD) and SIMS

Several analytical techniques have been used to characterize homogeneous films of tungsten-containing hydrogenated carbon (W-C: H), deposited on Si with a film thickness of 1–1.5 m. Electron probe microanalysis (EPMA) enables one to determine the major components W (3–43 at %) and C, impurities (< 2 at %) of Ar and O, and the mass thickness (300–1800 g/cm²) of the films. The agreement between the results of EPMA and the data (W-content, mass thickness) provided by Rutherford backscattering spectrometry (RBS) is 5–10% relative. Quantitative analysis of hydrogen in W-C:H films (1–16 at %) is carried out by the technique of elastic recoil detection (ERD). A suitable scheme for the determination of H in W-C: H films by SIMS is proposed, based on monitoring the intensity ratio of HCs⁺/CCs⁺ secondary ions.     

超高效液相色谱法同时测定肿节风中6个成分的含量

建立了同时测定肿节风中新绿原酸、绿原酸、隐绿原酸、咖啡酸、迷迭香酸、异嗪皮啶6个成分含量的超高效液相色谱方法。采用Waters Acquity UPLC BEH C_(18)柱(2.1 mm×50 mm,1.7μm)分离,以乙腈-水(各含0.1%甲酸)为流动相进行梯度洗脱,流速为0.5 mL·min~(-1),检测波长330 nm,柱温35℃;以异嗪皮啶为参照物,计算其与其余5种目标物的相对校正因子,并考察了不同色谱仪、色谱柱、流动相、流速、柱温对相对校正因子重现性的影响;通过相对校正因子计算各成分的含量,实现一测多评,同时采用外标法测定肿节风中各成分的量,并对一测多评计算值与外标法实测值进行配对t检验。肿节风中新绿原酸、绿原酸、隐绿原酸、咖啡酸、迷迭香酸、异嗪皮啶分别在0.522 0~26.09,1.482~74.13,0.591 0~29.49,0.632 5~31.29,2.612~130.5,0.970 4~48.73μg·mL~(-1)范围内线性关系良好(r≥0.999 7),仪器精密度、方法重复性、样品稳定性的相对标准偏差(RSD)均不大于1.9%,平均加标回收率为98.6%~101.5%,RSD(n=6)不大于1.9%。所建立的相对校正因子重现性良好,外标法实测值与一测多评法计算值无显著性差异(P0.05),均可用于肿节风中5个咖啡酰类和1个香豆素类成分的同时定量测定。     

Structure of iron (II) and cobalt (II) bromide complexes in aqueous solution by X-ray diffraction analysis

Structures of bromo-metal complexes in concentrated aqueous solutions of FeBr₂ and of CoBr₂ were investigated by X-ray diffraction analysis. The complexes possess an octahedral geometry coordinating Br^– along with H₂O ligands. The frequency factors of metal-Br contacts per one atom of metal were 0.325 for the 2.7M (mol-dm^–3) and 0.747 for the 4.5M FeBr₂ solutions, and 0.280 for the 2.8M and 0.595 for the 4.3M CoBr₂ solutions. The frequency factors suggested that the tendency of metal ions to forming monobromo complexes is in the order, Fe>Co>Ni相似文献   

聚碳酸丙烯酯中碳酸丙烯酯含量的测定

建立了气相色谱分析聚碳酸丙烯酯中碳酸丙烯酯含量的方法,该方法操作简单,准确度高,可满足工业检测需求.     

The compositional and mineralogical analysis of fired pigments in Nasca pottery from Cahuachi (Peru) by the combined use of the portable PIXE-alpha and portable XRD techniques

An analytical protocol based on the combined use of the portable PIXE-alpha (Particle Induced X-ray Emission) and XRD (X-ray Diffraction) non destructive techniques developed at the LANDIS laboratory (Laboratorio di Analisi Non Distruttive) of the INFN–CNR (Istituto Nazionale di Fisica Nucleare–Consiglio Nazionale delle Ricerche) in Catania (Italy), was applied for the characterisation of the surface paints of some archaeological fragments of Nasca pottery from the Ceremonial Centre of Cahuachi in Southern Peru.Measurements were carried out on the black, white, red, orange and grey pigments; quantitative information on the chemical composition as well as on the mineralogical phases present on the paints were obtained.Results allowed to make some considerations about the materials and the manufacturing technique used to realise such fired pigments.It should be noted that during firing the precursor minerals composing the pigments undergo a phase transformation and their identification presents some difficulties.     

Quantitative analysis of the P-glycoprotein inhibitor Elacridar (GF120918) in human and dog plasma using liquid chromatography with tandem mass spectrometric detection

A liquid chromatographic/tandem mass spectrometric (LC/MS/MS) method for the determination of the P-glycoprotein and breast cancer resistance protein inhibitor Elacridar in human and dog plasma is described. The internal standard was stable isotopically labelled Elacridar. Sample pretreatment involved liquid-liquid extraction with tert-butyl methyl ether. Analysis of Elacridar and internal standard was performed by reversed-phase LC on a basic stable minibore analytical column with an eluent consisting of acetonitrile and aqueous ammonia. An API-2000 triple-quadrupole mass spectrometer with an electrospray ion source was used in the positive-ion multiple reaction monitoring mode. The run time per sample was only 6 min. The method is sensitive and specific, with a dynamic range from 1 to 500 ng ml(-1) from 100 microl of human or dog plasma. The accuracy of the method was within 15% bias and the precision was lower than 15% for all tested concentration levels and in both matrices. The method is simple and the liquid-liquid extraction produces clean samples. This method was successfully applied to support the pharmacokinetics of a clinical trial in which orally applied Elacridar was used as a bioavailability enhancer.