光电直读光谱法测定7075铝合金中多元素

采用光电直读光谱仪同时测定7075铝合金材料中Si、Fe、Cu、Mg、Cr、Mn、Zn、Ti、Zr等多元素的含量.经试验选择了各元素的最佳光谱线和工作条件.测定结果的相对标准偏差为0.04%～4.20%,样品回收率为97.2%～100.7%.方法的准确度和精密度符合GB/T 6987-2001的技术要求.     

铝合金建材的X射线荧光分析

用高性能飞利浦PW2424型X射线荧光光谱仪,测定铝合金建材中的Si、Fe、Cu、Mn、Mg、Zn、Ti、Cr、Ni等9个化学元素的含量.给出各元素的干扰校正系数和基体效应校正系数.方法准确、灵敏,稳定性好,速度快.     

用于PM2.5样品测定的全反射X荧光仪的研制

研制适用于PM2.5样品分析的Mo靶和W靶全反射X荧光仪(TXRF)。该仪器主要部分为光路和软件系统,经过光路系统的设计、加工、调试,使入射光达到全反射;软件开发实现了控制和数据获取处理功能。Mo靶TXRF测量各元素检出限(ng)分别为K 9.4,Ca 4.1,Sc 8.5,Ti 3.0,V 3.5,Cr 3.2,Mn 1.5,Fe 0.99,Ni 0.24,Cu 0.63,Zn 0.5,Pb1.6,Ba 11.9;W靶TXRF测量各元素检出限(ng)分别为Na 1 935,Mg 1 087,Al 1 310,K 19.4,Ca 8.8,Sc 7.0,Ti 13.5,V 7.8,Cr 2.3,Mn 4.0,Fe 4.5,Ni 4.5,Ba 6.2。重复测量100 ng的Ba和200 ng的Ti各6次,测定结果的相对标准偏差分别为5.3%,1.4%;51.2μg/cm2 Zn和9.0μg/cm2 Ca测量结果与标准值的相对偏差分别为0.2%,5.8%。用Mo靶、W靶TXRF分别连续测量标准薄膜Cu样和Fe样4 h,测定结果的相对极差分别为5.1%,6.0%。该仪器检测限低,测量重复性、准确度、长期稳定性均满足ng量级微量元素的测量需求,可用于大气微尘样品的直接测量。     

铝合金化学成分标准物质的研制

介绍铝合金化学成分标准物质的研制过程。采用中频感应电炉熔炼法制备了铝合金化学成分标准物质候选物,并对标准物质候选物的均匀性和稳定性进行了考察。选择6家具有资质的实验室对研制的标准物质中各化学成分进行协作定值,并对各元素定值的不确定度进行评定。结果表明,在95%的置信区间内标准物质均匀性良好,经过13个月稳定性考察试验,标准物质稳定性良好。Si,Fe,Cu,Mn,Mg,Ti,Cd,V,Zr,B,Sn,Zn的定值结果分别为0.013 8%,0.012 5%,2.868%,0.185%,0.014 0%,0.082 8%,0.041 7%,0.032 9%,0.031 4%,0.003 8%,0.003 4%,0.025 6%,定值结果的相对扩展不确定度为1.4%~9.0%(k=2)。研制的标准物质达到相关技术要求,可用于该类铝合金材料的质量控制。     

ICP-AES法测定红土镍矿中镍、钙、钛、锰、铜、钴、铬、锌与磷的含量

建立了ICP-AES法测定红土镍矿中Ni;Ca;Ti;Mn;Cu;Co;Cr;Zn和P含量的方法。样品用HCl、HNO3溶解,加入HF和HClO4,加热至HClO4烟冒尽,用HCl溶解盐类,过滤,采用ICP-AES法同时测定滤液中Ni、Ca、Mn、Cu、Co、Zn、P;残渣经灼烧、挥硅、K2S2O7熔融、HCl浸取,所得溶液与滤液合并,测定溶液中Cr和Ti含量。方法检出限:P为0.022μg/mL,其它元素在0.0032～0.0085μg/mL之间,方法的精密度(n=7)在1.4%～2.9%之间。分析结果与分光光度法、XRF法和AAS法分析结果的相对误差:Ni、Cu、Co、Cr小于5%,Ti和Mn小于10%,Zn小于15%,Ca和P小于19%。     

微波辅助消解ICP-AES法测定小茴香中20种元素

采用微波消解法处理小茴香样品,电感耦合等离子体发射光谱(ICP-AES)测定其中Na、K、Sr、Ca、Mg、P、As、Zn、Pb、Co、Cd、Ni、Ba、Fe、Mn、Cr、Cu、Al、Ti和B 20种常量和微量元素的含量。20种元素的检出限为0.00002~0.00468μg·mL-1,回收率为89.50%~107.89%,相对标准偏差(RSD)均小6%。结果显示,小茴香果实及其嫩叶中除含有人体必需的常量元素K,Na,Ca,Mg,P外,还含有Fe、Zn、Mn、Cr、Co等必需的微量元素和其他元素Ti、B、Ni、Al、Sr、Ba等。     

火焰原子吸收光谱法测定黄花菜根中微量元素含量

采用火焰原子吸收光谱法测定了黄花菜根中Ca、Fe、Zn、Cu、Mn、K和Mg 7种金属元素含量.结果表明,在常量元素中K、Ca含量较高,微量元素中Fe、Cu含量较高,7种金属元素含量由高到低顺序分别为:K、Ca、Mg、Fe、Cu、Zn、Mn.加样回收率为98.75％～106.25％,该法操作简单、结果准确,是黄花菜根中...     

磷酸三丁酯色层分离-电感耦合等离子体原子发射光谱法测定U_3Si_2中22个微量杂质元素

本法对U_3Si_2中22个微量杂质元素的测定,进行了较系统的实验研究.取样100mg时,Al、Ca、Cd、Co、Cr、Cu、Fe、Hf、In、Mg、Mn、Mo、Nb、Ni、Pb、Sn、Ta、Ti、V、Y Zn和 Zr的测定范围5μg/g~800μg/g,回收率为94%~105%,RSD(n=8)为0.4%~1.2%.     

108例甲状腺功能障碍患者全血9种元素相关性研究

通过原子吸收光谱技术对68例治疗前甲亢病人(A组)，35例治疗后甲亢病人(B组)，5例甲减病人(C组)及74例正常人(D组）全血多种微量元素测定分析，结果显示：D组Cu与Al，Mg与Mn正相关；Al与Zn、Se负相关；A组Fe与Zn、Ca，Ca与TT4。Cu与Mn正相关，TT与Zn、Cr负相关。B组Fe与Zn、Cu、Mg，Zn与Cu、Mn、Mg与Ca、Se、Se与TT3正相关。     

肺癌组织中微量元素的研究

用ICP等离子体发射光谱法测定了肺癌组织中Cd、Cr、Co、Mg、Mn、Ni、Pb、Sr、Ti、Se、Al、Ba、Zn、Fe、Cu、Be等16种微量元素古量。结果显示．与同侧无癌肺叶组织相比较，肺鳞癌和肺腺癌组织中Cr、Cu和Mg含量均显著升高．Cd、Mn和Zn含量均显著降低。两型肺癌组织中Cd、Fe和Ba3种元素音量之间存在明显差异．而两型肺癌的同侧无癌肺叶组织的微量元素含量之间除Cd外均无明显差异。     

Assessment of atmospheric deposition of metals in Ha Noi using the moss bio-monitoring technique and proton induced X-ray emission

Journal of Radioanalytical and Nuclear Chemistry - The concentration of 22 metal elements including Mg, Al, Si, P, S, Cl, K, Ca, Ti, Cr, Mn, Fe, Ni, Cu, Zn, As, Br, Rb, Sr, Zr, Ba and Pb in Barbula...     

Verfahren zur Spurenanalyse aus metallischen Proben

Zusammenfassung Ein neues lösungsspektrographisches Zerstäubungsverfahren wird beschrieben, bei dem die Lösung so zerstäubt wird, daß sie die Graphitelektroden nicht berührt. Mit diesem Verfahren könnten 10^–3 bis 10^–5 % Al, B, Cr, Cu, Mg, Mn, Mo, Ni, Si, Sn, Ti, V und Zr in Eisen und Stahl bestimmt werden.Zur Bestimmung von Verunreinigungen oder Einschlüssen in Stahl wird ein spektrographisches Verfahren mit Preßlingselektroden empfohlen, das nur 0,1–1 mg Rückstand benötigt. Oxide von Al, B, Ca, Co, Cu, Cr, Fe, Mg, Mn, Mo, Nb, Ni, Pb, Si, Sn, Sr, Ti, V, Zn und Zr konnten bis herab zu etwa 10^–7 g erfaßt werden.

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Methods for the determination of trace elements from metallic samples

The principles of a new spectrographical atomizing-method of solution are described. The solution has to be atomized into a gap without contacting the surface of the graphite electrodes. In this way the exact determination of 10^–3 to 10^–5 % of Al, B, Cr, Cu, Mg, Mn, Mo, Ni, Si, Sn, Ti, V and Zr in iron and steel is possible.The microanalytical determination of impurities or inclusions in steel has been achieved by a spectrographical method with briquette electrodes. The necessary amount of isolation residue is only 0.1–1 mg. The oxides of Al, B, Ca, Co, Cu, Cr, Fe, Mg, Mn, Mo, Nb, Ni, Pb, Si, Sn, Sr, Ti, V, Zn and Zr can be accurately determined by this procedure. The limit of determination is about 10^–7 g.

     

急性脑血管病患者血清元素的测定

采用高频等离子体发射光谱法测定了３４例脑梗塞、３３例脑出血和对照组２７人血清锌、铜、锰、铬、镁、钼、锶、铁、钛、钡、镉和钙共１２种元素的含量。结果显示脑梗塞和脑出血组血清锌和锌／铜比值显著高于对照组；锰和钼含量仅在脑梗塞组明显增高，锶仅在脑出血组显著增高，而其它几种元素疾病组与对照组无显著性差异。伴有高血糖、高血脂和高血压的病人，其血铬含量显著降低，表明锌、锌／铜比值、锰、钼、锶、铬元素与急性脑血     

Application of nondestructive X-ray fluorescence analysis to determine the element composition of medicinal plants

A nondestructive X-ray fluorescence technique has been developed to determine Na, Mg, Al, Si, P, S, Cl, K, Ca, Ti, Cr, Mn, Fe, Ni, Cu, Zn, Br, Rb, Sr, Ba, and Pb in plants. The line element intensities were measured by an S4 Pioneer X-ray sequence spectrometer (Bruker AXS, Germany). The inversely proportional relationship was obtained between the analyte line intensity and mass of the plant, pressed on boric acid backing, for elements with an atomic number 11 < Z < 20. It was found that reduction of plant mass from 6 to 1 g leads to an increase in element determination sensitivity. The detection limits for 1 g of pressed plant were evaluated as μg/g: 5–20 (Na, Mg, Al); 1–4 (Si, P, S, Cl, K, Ca, Ti, Ba, Pb); 0.4-0.8 (Cr, Mn, Fe, Ni, Br, Cu, Zn, Rb and Sr). This technique was applied to determine the element composition of violets of Violaceae family, which are used in medicine.     

Direct multielement determination of trace elements in boron carbide powders by direct current arc atomic emission spectrometry using a CCD spectrometer

The use of direct current arc atomic emission spectrometry (DC-arc-AES) with a CCD spectrometer for the direct determination of the trace impurities Al, Ca, Cr, Cu, Fe, Mg, Mn, Na, Ni, Si, Ti, and Zr in three well characterized boron carbide powders is described. The detection limits obtained by the procedure were found to be between 0.2 (Mg) and 25 (Na) ??g?g^?1 for the above elements. Three boron carbide powder samples with trace element concentrations between 0.9 (Cu) and 934 (Si) ??g?g^?1 for Al, Ca, Cr, Cu, Fe, Mg, Mn, Na, Ni, Si, Ti, and Zr ?? including the standard reference material ERM?-ED102 ?? were analyzed by DC-arc-AES. The relative standard deviations for 9 measurements when using 5.0?±?0.3?mg of the respective samples were found to vary from 6.2 to 27% for Al and Cu, respectively. The trace elements Al, Ca, Cr, Cu, Fe, Mn, Ni, Si, Ti and Zr could be determined in the standard reference material and their concentrations determined by DC-arc AES were found to be between 89 and 116% of the accepted values. Fe and Ti were determined by DC-arc AES in the three boron carbide samples as well as in Al₂O₃, BN, SiC, coal fly ash, graphite and obsidian rock. The correlation coefficients of the plots of the net intensities versus the accepted values over the concentration ranges from 18 to 1750 and from 6 to 8000???g?g^?1 are 0.999 and 0.990 for Fe and Ti, respectively.

ICP-AES法测定铝中铁、硅、铜、镓、镁、锌、锰和钛

用 50g L氢氧化钠溶液溶解铝样品 ,硝酸 (1 1 )酸化 ,以ICP AES测定其中铁、硅、铜、镓、镁、锌、锰和钛等 8种杂质元素。     

Simultaneous PIXE and PIGME Analysis of a Nigerian Tar Sand Sample from a Deep Borehole

Tar sands from a deep borehole in southwestern Nigeria were subjected to elemental analysis by simultaneous proton induced X-ray emission (PIXE) and proton induced gamma-ray emission (PIGME) techniques. The concentration of 22 major, minor and trace elements, namely Al, Ca, Cr, Cu, F, Fe, Ga, Ge, K, Li, Mg, Mn, Na, P, Pb, Rb, S, Si, Sr, Ti, Zn and Zr were determined. The accuracy and precision of the techniques for chemical analysis were assured by analysing the NBS 278 geological standard.     

X射线荧光光谱法测定超硬铝合金中成分

叙述了用SRS 300型X射线荧光光谱仪测定超硬铝合金中铜、镁、锌、铁、硅、锰、铬、镍、钛、锆的X射线荧光光谱分析方法。试样用车床加工至表面平整、光滑，采用强度校正模型，由计算机拟合回归曲线。此法测定结果与常规湿法化学法测定结果相符。