火焰原子吸收光度法连续测定陶瓷颜料中的铬钴锰铁镍

研究了空气—乙炔火焰原子吸收光度法连续测定陶瓷颜料中的铬、钴、锰、铁、镍、氢氧化钾高温处理样品，方法简单、快速、准确，干扰元素少，方法标准偏差小于2．1％，回收率98—103％，相对标准偏差小于6．‰。     

微波消解——DUO-ICP-AES测定电子电气产品塑料中的铅、镉、铬和汞的方法研究

采用微波消解技术,将电子电气产品中的塑料样品用硝酸-氟硼酸-过氧化氢在210℃的温度下加热约1h溶解后,用全谱直读DUO-ICP-AES同时测定塑料中铅、镉、铬和汞,方法的检测限为0.0015~0.011μg/m l,该方法的回收率和精密度分别为91.2%~100.5%和0.45%~3.18%,2h内实际样品的检测结果较为满意。该方法快速简便,可应用于电子电气产品塑料中的铅、镉、铬和汞日常检验。     

电感耦合等离子体发射光谱法同时测定钒渣中的钼和镍

采用硝酸-高氯酸-硫酸-盐酸处理样品,运用ICP的标准加入法,同时测定钒渣中的钼和镍。实验表明:本方法回收率达95.35%100.8%,精密度(RSD,n=10)为1.0%排P1污,T水1,W:1图3Ue闪二PP22蒸次,,TT蒸2凝2,,WW汽液32::1.2%,操作简便,方法快速,具有很大的实用价值。     

电感耦合等离子体技术测定微量铁和锰

1 前言 本文利用电感耦合等离子体技术对标准样品铁黄铜(HFe59—1—1)中的Fe和Mn进行了分析测定。实验证明,该法可在铜含量较高的情况下准确、快速地测定微量元素铁和锰的含量,且省样节时,处理简便,灵敏度高,便于推广。     

矾土中钾、钠、硅、铁、钙、镁、钛的ICP-AES测定

以碳酸锂-四硼酸锂为熔剂,铝矾土试样经高频融样机高温熔融。熔融物在PTFE烧杯中,用稀盐酸加热溶解。样品溶液使用电感耦合等离子体原子发射光谱仪测定,结果准确度高、重复性好。     

测定钨铁中钼的简便方法

建立了不经分离用电感耦合等离子体发射光谱（ICP—AES）直接测定钨铁中钼的方法。样品经过硝酸-盐酸-氢氟酸混合酸溶解后于优化选定的仪器条件下在202．031nm处直接测定,结果与化学法有很好的吻合,相对标准偏差（RSD）小于0．06％,使用本方法的测定结果令人满意,相对于复杂的化学分析方法,该法操作简便、分析快速、结果准确可靠。     

电感耦合等离子体原子发射光谱法测定钼矿石中钼镍锌

采用盐酸-硝酸-氢氟酸-高氯酸处理样品,电感耦合等离子体原子发射光谱法同时测定钼矿中钼、镍、锌3个元素,筛选了不同溶矿方法和仪器参数条件。通过对国家一级钼矿标准物质的分析,测定结果与标准值相一致。测定的相对标准偏差(RSD,n=11)为0.74%~1.75%。应用于实际钼矿石样品中钼镍锌的测定,回收率为95%~106%。     

玻璃着色元素铁、钴、镍、硒的同时测定

研究了利用电感耦合等离子体原子发射光谱仪同时测定玻璃中着色元素铁、钴、镍、硒的分析谱线、射频发生器功率、雾化气流量等工作参数的选择,建立了ICP-AES法同时测定玻璃中铁、钴、镍、硒的方法,方法的相关系数在0.999以上,RSD值不大于10%,各元素回收率在86.0%至106.7%之间,可满足生产及科研的需要.     

火焰原子吸收光谱法分析精对苯二甲酸中锰、钴、铁、铬、钼和镍

采用火焰原子吸收光谱法分析精对苯二甲酸中的锰、钴、铁、铬、钼和镍。结果表明,精对苯二甲酸灰化温度600℃比较合适,六种金属标准曲线相关系数均大于0．9990,检出限在0．000726-0．009849μg／mL之间,分析结果最大相对误差10％,相对标准偏差5．0％,用硝酸和盐酸溶解灰份效果最好,加标回收率在90％-107％之间。     

海绵钛中Fe,Ni和Cr杂质引入过程分析

采用Kroll法,以TiCl4和液态金属镁制备海绵钛,对海绵钛分部位取样,对高Fe, Ni和Cr含量样品进行MLA检测,计算Ti?Mg?Fe, Ti?Mg?Ni和Ti?Mg?Cr三元系的混合焓,研究海绵钛中Fe, Ni和Cr杂质的来源及引入过程。结果表明,海绵钛中Fe, Ni和Cr杂质主要来自钢制(1Cr18Ni9Ti)反应容器,其引入经历了在液态金属镁中溶解和与海绵钛合金化两步。当海绵钛于反应器壁处生成后,其与以单质形式溶于液态金属镁中的Fe, Ni和Cr原子结合将杂质富集。采取反应容器镀膜处理、控制反应区温度、使用低杂质含量的液态金属镁、将海绵钛坨底部与边部分离等措施可有效降低海绵钛中杂质含量。     

ICP-AES分析低合金钢中的Mn、Mo、V、Ni、Al、Cu、Cr元素

用等离子发射光谱法测定低合金钢中的Mn、Mo、V、Ni、Al、Cu、Cr元素,试样用HNO3和HCl在加热条件下分解,经过系列试验,选择仪器的工作条件,进行测定,建立了一套分析方法,经对照分析,分析结果令人满意。本方法快速准确,精密度良好,完全可以满足生产需要。     

ZCP—AES分析低合金钢中的Mn、Mo、V、Ni、Al、Cu、Cr元素

用等离子发射光谱法测定低合金钢中的Mn、Mo、V、Ni、Al、Cu、Cr元素，试样用HNO，和HCl在加热条件下分解，经过系列试验，选择仪器的工作条件，进行测定，建立了一套分析方法，经对照分析，分析结果令人满意。本方法快速准确，精密度良好，完全可以满足生产需要。     

High-entropy La(Fe0.2Co0.2Ni0.2Cr0.2Mn0.2)O3 ceramic exhibiting high emissivity and low thermal conductivity

A novel, high-entropy, perovskite-structured, solid solution La(Fe_0.2Co_0.2Ni_0.2Cr_0.2Mn_0.2)O₃ ceramic was successfully synthesized via high-temperature solid-state reaction. The crystal structure, microstructure, infrared emissivity, and thermophysical properties were investigated. The experimental results indicated that La(Fe_0.2Co_0.2Ni_0.2Cr_0.2Mn_0.2)O₃ exhibited an infrared emissivity as high as .92 in the near-infrared region of .76–2.50 μm. The thermal conductivity was 1.38–1.72 W m⁻¹ K⁻¹ in the temperature range of 25–1200°C.     

Study of Methane Decomposition on Fe/MgO-Based Catalyst Modified by Ni,Co, and Mn Additives

Catalytic decomposition of methane (CDM) generates clean hydrogen and carbon nanomaterials. In this study, methane decomposition to hydrogen and carbon was investigated over Ni-, Co-, or Mn-doped Fe/MgO catalysts. The doping effect of different metals, varying from 3 to 10?wt%, was investigated. The catalytic performance of the obtained materials (noted 15%Fe+x%metal/MgO) revealed that the doping effect of Ni, Co, and Mn significantly improved the activity of Fe/MgO. Among the Ni-doped catalyst series, the 15%Fe+3%Ni/MgO catalyst performed better than the rest of the Ni catalysts. The 6%Co-containing catalyst remained the best in terms of activity in the Co-doped catalyst series and the 15%Fe+6%Mn/MgO solid showed better methane conversion for the Mn-doped series. Overall, 3%Ni-containing catalyst displayed the best catalytic performance among all Ni-, Co-, and Mn-doped catalysts. XRD, N₂ sorption, and H₂ temperature-programmed reduction (TPR), Laser–Raman spectroscopy, thermogravimetric analysis (TGA) under air, and temperature-programmed oxidation (TPO) were used for catalyst characterization. The results revealed that all the doped catalysts exhibited better metallic active site distribution than 15%Fe/MgO and proved that metal doping played a crucial role in catalytic performance.     

Separation and concentration processes of solutions of Co(II), Ni(II), Cr(III), Fe(III) and Mn(II) by extraction with toluene-dissolved rosin

The extraction and stripping of Co(II), Ni(II), Cr(III) and Fe(III) from aqueous solutions by rosin dissolved in toluene has been investigated. Results obtained show that rosin is better extractant than abietic or n-lauric acids under comparable conditions. From these results, and the data of Mn(II) solvent extraction studied previously under the same conditions, a separation and concentration process for these five cations in aqueous solutions has been designed. Saturated solutions of Fe(III), Cr(III), Mn(II) and finally Co(II) and Ni(II) have been obtained successively by extraction and stripping, by addition of ammonium hydroxide to obtain the appropriate pH value, and by modifying adequately the organic phase/aqueous phase volume ratio.     

快淬Zr0.9T i0.1(N i,Co,Mn,V)2.1贮氢合金的结构与性能

对比了熔体快淬合金和常规熔铸合金Zr0.9Ti0.1(Ni,Co,Mn,V)2.1的微结构和电化学性能. XRD分析表明: 熔体快淬合金在退火前后的晶体结构与铸态合金一样,都为面心立方结构,由Laves C15主相组成;随快淬速度的增加,快淬合金中的非晶成份增多. 电化学测试表明:快淬合金有较好的活化性能,经6~8次循环即可完全活化,但其最大放电容量较低,小于270 mAh/g;而退火后的快淬合金需经30次循环才能完全活化,其最大放电容量皆为340 mAh/g左右,高于铸态合金和退火前的快淬合金;在电流密度为300 mA/g下充放电循环,发现退火后的快淬合金循环稳定性明显高于铸态合金电极,并且随快淬速度增加,循环稳定性越好.     

原子吸收法测定循环醋酸中钴锰含量

介绍了原子吸收法测定PTA生产过程的循环醋酸中钴锰含量的方法 ,并把用该法测定的结果与X 射线荧光法测定结果进行比较 ,结果表明 ,前者精密度好 ,准确性高 ,速度快 ,杂质干扰小 ,完全可代替后者     

Hydrodesulfurization of thiophene on carbon nanofiber supported Co/Ni/Mo catalysts

Co, Mo, NiMo and CoMo catalysts supported on alumina, fishbone and platelet carbon nanofibers (CNFs) have been prepared. The dispersion of the oxide phases was qualitatively studied and compared using X-ray diffraction (XRD) and transmission electron microscopy (TEM). The reducibility of the catalysts was studied by temperature programmed reduction (TPR). Hydrodesulfurization (HDS) of thiophene was used as a model reaction to compare the activity of different catalysts. The activity tests showed that the alumina supported catalysts exhibited higher activity compared to the corresponding CNF supported catalysts, and the NiMo catalysts were more active than the corresponding CoMo catalysts. The thiophene HDS activity was correlated with the dispersion of the molybdenum species and the reducibility of different catalysts. Interestingly, the CNF supported Co catalysts have higher thiophene HDS activity than the CNF supported Co(Ni)Mo catalysts.     

Synthesis and optical properties of Ni/Co/Cr doped BaMg6Ti6O19

Novel green and blue chromophores based on Ni/Co/Cr doped BaMg₆Ti₆O₁₉ solid solutions are successfully synthesized through a solid-state reaction. The crystal structure of all the samples belongs to the magnetoplumbite structure with the space group of P6₃/mmc. The BaMg_6-x/2Ti_6-x/2Ni_xO₁₉ (0 ≤ x ≤ 0.3) compounds exhibit a light green (x = 0.1) to yellow-green (x = 0.3) color. The oxidation state of Ni is confirmed to be +2 valence and the d-d transition of Ni²⁺ in octahedral sites is responsible for color. BaMg_6-x/2Ti_6-x/2Co_xO₁₉ (0 ≤ x ≤ 0.3) series show a blue color and the intensity of blueness is increasing with the increase of Co content. The blue color is due to d-d transitions within Co²⁺ present in the tetrahedral sites. For BaMg_6-x/2Ti_6-x/2Cr_xO₁₉ (0 ≤ x ≤ 2) phases the color varies from light green (x = 0.2) to green (x = 2). Chromium exists in +3 and + 6 oxidation states and the observed color is due to charge transfer transition between Cr³⁺–Ti⁴⁺ and d-d transitions within octahedral Cr³⁺ sites resulting in strong absorption in the visible region. The synthesized colored oxides are mixed with PMMA to prepare novel green and blue PMMA polymer composites to evaluate their compatibility in plastics.