ICP-AES测定铝合金中的锰、镁、铬、铜、镍、铁、钛、锌

采用硝酸溶解样品,电感耦合等离子发射光谱同时测定铝合金中的锰、镁、铬、铜、镍、铁、钛、锌元素。经实验,该方法简单、快速,结果准确、可靠。     

ICP-OES法测定碱式碳酸铜中 钠、铁、铅、锌、钙、铬、镉、砷

提出了用电感耦合等离子体发射光谱法（ICP-OES）测定碱式碳酸铜中钠、铁、铅、锌、钙、铬、镉、砷等杂质含量。对测定条件及工作参数进行了研究,采用钇标准溶液内标法消除基体干扰,通过选择适宜的分析谱线以消除光谱干扰。与原子吸收分光光度计法（AAS）相比,此方法分析速度快、精密度高。     

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。     

DUO-ICP-AES测定精对苯二甲酸中的钴、铬、铁、锰、钼、镍、钛

采用DUO-ICP-AES同时测定精对苯二甲酸中钴、铬、铁、锰、钼、镍、钛,并对仪器的分析线选择、背景校正、入射功率、雾化器压力、辅助气流量、冷却气流量、蠕动泵转速的影响及共存元素的干扰、硝酸铯灰化助剂等因素进行了详细的研究。方法的检测限:钴0.0097 mg/L;铬0.0021 mg/L;铁0.0078 mg/L;锰0.0012 mg/L;钼0.0027 mg/L;镍0.016 mg/L;钛0.0027 mg/L,回收率和精密度分别为93.0%～99.5%和0.37%～3.2%。该方法快速简便,具有良好的精密度和准确度,适用于进出口精对苯二甲酸的日常检验。     

ICP-OES测定工业污水中铜、锌、硼、砷、铅、镉、铬

目前,测定工业污水中铜、锌、硼、砷、铅、镉、铬的国家标准方法为原子吸收光谱法和比色法[1],其测定耗时较长,操作繁琐。笔者采用电感耦合等离子体发射光谱仪(ICP-OES)同时测定工业污水中铜、锌、硼、砷、铅、镉、铬,方法简单、准确、快速。笔者建立的测定方法与参考文献[2]的方法基本相同,方法回收率及精密度均能满足要     

等离子发射光谱法测定钒铁中的铜、硅、铝、磷、铬、镍、钨、锰

叙述采用等离子发射光谱法同时测定钒铁中的铜、硅、铝、磷、铬、镍、钨、锰等微量元素 ,试样用稀王水分解 ,选择适当的波长与背景校正进行分析测定 ,方法回收率在 95%～ 1 0 5%之间 ,相对标准偏差均小于 4% ,本方法快速准确 ,精密度良好。     

ICP—AES法测定金属钙中铁、镍、铜、锰、镁、硅、铝

研究了ICP-AES法测定金属钙中铁、镍、铜、锰、镁、硅、铝的样品处理和分析条件。金属钙线经表面处理和制样后,马上用（1＋1）硝酸溶解、定容,工作曲线不需作基体匹配。在选定的分析谱线和仪器条件下测量,相对标准偏差为1．3％～13．1％,回收率92．2％～107％。本方法简便、快速、准确,可以满足生产需求。     

XRF测定磷石膏中磷、铁、铝、镁、硫、钾、钠、硅

XRF法测定磷石膏中磷、铁、铝、硫、钾、钠、硅时,克服了传统法耗时长、劳动强度大、所用试剂多的缺点,操作简便,测定结果与传统法一致,准确度高,精密度好,能满足生产工艺控制、磷石膏综合利用等磷石膏分析的需要。     

发射光谱定量测定硼、铅、锡、钼

样品以氧化锌、氟化钠、硫为缓冲剂。锗为内标,改善元素蒸发行为,大幅降低分析背景,分别对长波、短波板采用不同的显影时间。实现样品的硼、铅、锡、钼同时测定。此法广泛应用于各类地质样品中,取得满意的分析结果。     

ICP—AES测定石英砂中的铁、铝、钙、钛、硼、磷

本文阐述了用ICP—AES法同时测定石英砂中的Fe、Al、Ca、Ti、B、P,试样用HF和H2SO4加热分解,HCl溶解盐类。试样的处理只需一次便可做多元素的分析。测定结果准确、快速,相对偏差小,在操作上更易掌握。     

微波消解ICP-AES法测定润滑油中的铁,镍,铜,锌,硼,磷

通过微波消解处理润滑油,ICP法测定润滑油中铁,镍,铜,锌,硼等元素,通过正交实验进行微波消解条件优化,并进行了精密度实验,标准样品的回收率为98%以上,相对标准偏差小于1%。     

新型高效肥料创制的意义,现状及发展趋势

系统分析了新型高效肥料创制的意义,阐述了缓／控释肥料、稳定肥料、复合（混）肥料和有机肥料的发展现状和趋势,提出了今后我国新型高效肥料创制的方向。     

新时代，以创新思维审议磷矿加工方法

地球已进入以人类为中心的“人类纪元”。为使全球可持续发展,应考虑今后几十代人对磷资源的需求。介绍了世界磷资源现况及国内外最新磷矿储量数据,分析了我国磷肥产品结构;提出高品位、易加工磷资源用于磷化工、磷化学品合成,低品位、难选磷矿用于含磷肥料生产的新思路,并认为生产过磷酸钙、钙镁磷肥比生产磷铵类肥料对磷资源利用更合理。提出了磷肥产业结构调整新战略,以使我国磷资源的可采寿命从目前的100—200年延长至500年。     

ICP-OES测定大量元素水溶肥料中锌、镁、铜、铁、锰、钼、硼含量

采用ICP-OES对大量元素水溶肥料中微量元素锌、镁、铜、铁、锰、钼、硼进行分析,研究确定了最佳分析条件。加标回收率为96.94%～106.2%,RSD为0.50%～1.40%,检出限为0.001 8～0.218 0 mg/L,方法简便、快速、准确。     

Synthesis of methyl,propyl, butyl,isobutyl, hexyl,cyclohexyl, octyl,and 2-ethylhexyl esters of epoxyoleic acid

A series of esters of 12,13-epoxyoleic acid were prepared by means of alcoholysis of triepoxyolein (trivernolin). The procedure for the alcoholysis, and isolation and purification of the esters are described. Analytical characteristics of the esters are reported. E. Util. Res. Devel. Div., ARS, USDA.     

Morphological,structural, surface,thermal, chemical,and magnetic properties of Al-doped nanostructured copper ferrites

Aluminum-doped copper ferrite nanoparticles synthesized via thermal decomposition were analyzed for Al³⁺ substitution effects. Nanocrystalline doped copper ferrite with a crystallite size <9 nm was characterized using several advanced techniques, including X-ray diffractometry (XRD), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and X-ray photoelectron spectroscopy (XPS). The degree of thermal decomposition used for doping copper ferrite at the nanoparticle level correlates well with the quantitative, dimensional, and structural characterizations. The Scherrer equation and Williamson–Hall method were employed to determine the general lattice strain and constants. Structural properties, such as the oxygen positional parameters, radii of the octahedral and tetrahedral sites, hopping lengths, bond lengths and angles, site bonds, and edge lengths, were determined using XRD patterns. The improved A–B super-exchange interaction was demonstrated by the discrepancy in the theoretically anticipated bond angles. The analysis of magnetic hysteresis (M − H) using a vibrating sample magnetometer (VSM) and XPS confirmed the improvement in the super-exchange interaction. XPS results suggest that Fe and Cu in the crystal lattice are in the form of Fe^III and Cu^II, respectively. The investigation of the degree of inversion, state, and composition using XPS aids to understand the properties of the nanostructured copper ferrites. The saturation and remnant magnetization were determined from hysteresis loops at 1.8 T obtained using the VSM at room temperature. The noncollinear spin and efficient sublattice interactions are responsible for the decrease in M_s and M_r.     

ICP—AES法测定镍铁中Si、Co、Cu、P、Mn、Cr

研究了用ICP—AES法测定镍铁中Si、Co、Cu、P、Mn、Cr元素含量的分析方法。分析了镍基和铁基效应对某些元素强度影响情况,采用基体匹配法消除镍基和铁基的干扰效应。采用信倍比和净强度为仪器测量的选择条件,用多元素混合标准溶液绘制工作曲线。测出镍铁中的Si、Co、Cu、P、Mn、Cr元素分析方法检出限。此方法有较高准确度和精密度。     

电感耦合等离子体原子发射光谱法同时测定金属饰品中铅、镉、铬、汞、锑、砷、硒、钡、镍含量

采用电感耦合等离子体原子发射光谱法同时测定金属饰品中铅、镉、铬、汞、锑、砷、硒、钡、镍的含量.用体积比为3∶1的浓硝酸和浓盐酸微波溶解样品,研究了样品的消解方法、消解介质、分析谱线及工作参数等对检测结果的影响.方法的检测限(mg/L):铅0.06、镉0.009、铬0.002、汞0.04、砷0.02、硒0.01、钡0.0...     

Continuous solvent extraction of sunflower,seed, groundnuts,palmkernels, rapeseed,and copra

In principle, the oil milling process is straightforward. The wide variety of equipment in use reflects, however, a multiparametric process. The main limiting parameters are kind of seed, oil content, particle strength, particle structure, temperature, moisture, particle size, residence time, mechanical forces, etc. Additionally, the seed specific parameters vary not only between kinds of seed but also for the same seed, due to different conditions in climate, soil, and harvesting. Therefore, equipment design must be widely based on statistical averages of the limiting parameters. In other words, exact precalculation of the single technological steps is impossible. As a consequence, for more than 5,000 years, the oil milling process has been in the stage of being optimized. The acutal technical standard is very satisfying, but there is still a strong need for further research and development. Currently, as in the past, the oil milling process seems to be not so much a science as an art.