不同制油工艺对油茶籽中金属元素迁移影响的研究

采用电感耦合等离子质谱法检测油茶籽及其压榨油和饼粕中12种金属元素含量，并结合主成分分析、正交偏最小二乘差别分析等多元分析，研究3种制油工艺（液压压榨、双螺杆压榨和索氏浸提）对油茶籽中金属元素的迁移的影响。结果显示，油茶籽中含有丰富的金属元素，而K元素含量最高达9431μg/g；制油工艺能影响油茶籽油中微量元素和重金属的含量，对迁移率影响从大到小顺序为索氏提取>双螺杆压榨>液压压榨；油茶籽中的金属元素主要转移到了饼粕中，油中金属元素迁移量较少，索氏提炼的油中微量金属元素、重金属含量高于其余两种压榨油；不同制油工艺主要影响油茶籽油中Ca、Mg、Na、Mn、As元素含量，对Fe元素含量影响最小，且油中Ca、Mg、Na、Mn含量呈显著正相关，而As与它们呈负相关。     

镀镍饰品可导致过敏反应

金属镍的毒性小,近似银白色、硬而有延展性并具有铁磁性的金属元素,它能够高度磨光和抗腐蚀,可用来制造不锈钢和其他抗腐蚀合金,用来制造货币等,镀在其他金属上可以     

The Role of Saturated Hydrocarbon in Enrichment of Cu, Pb, Zn in Kupferschiefer, Southwestern Poland

In order to clarify the role of organic matter in the enrichment of base metal, 10 samples of the Permian Kupferschiefer from southwestern Poland were analyzed by using microscopic and geochemical methods. The results indicate that the solvent extracts have been depleted in the samples with high Cu, Pb, Zn contents. This depletion occurred preferably in saturated hydrocarbons. Saturated hydrocarbons served as hydrogen donor for thermochemical sulfate reduction (TSR).- The GC traces of saturated hydrocarbon show that the depletion occurred mainly in long-chain n-alkanes.     

有诗相伴，无香亦醉

古人读书作诗弹琴时，旁边习惯点香，当香刚巧燃尽时，自己喜欢的女人进屋给炉添上香，便是红袖添吞。历经百余年，铜炉逐渐成亍时髦的收藏品，因为含有金属元素所以非常容易氧化，铜炉也如女人一样要识之、养之、爱之、护之才可以逐渐完美。     

谈谈年份酒与鉴别方法

本文阐述了年份酒值得注意的工艺规程,列举了白酒中金属元素在不同贮存期的变化规律;论述了白酒胶溶特性变化趋势,提出年份酒的鉴评方法.     

二辛基硫醚在贵金属元素分析上的应用 Ⅰ.地质样品中痕量银的中子活化分析

本文研究了二辛基硫醚的萃取性能并将其用于地质样品中痕量银的中子活化分析(NAA)。将地质样品于反应堆(中子通量为(4-7)×10~(13)n/cm~2·s)中照射200h,冷却一个月以上,用HF-HNO_3-HClO_4分解样品,于1N HNO_3介质中用0.2M二辛基硫醚-氯仿溶液萃取,有机相作Ge(Li)γ谱分析,用相对比较法求出样品中银含量。化学产额为92％。分析了水系沉积物、岩石和土壤标样,测得银的含量范围为0.023-4.35ppm,实际样品的测定精密度在±15％以内。     

浓情马洛克

2010年,原本流行于配饰、衣眼上的BlingBling风潮蔓延到妆容。金银、炭黑、青铜、紫色等带有金属元素的色彩摇身一变成为化妆师的宠儿，这些华丽的色彩汇聚出各种夸张性感的美丽妆容——我们俨然感觉到，巴洛克风格又回来了！     

如何合理使用不锈钢餐具

不锈钢是由铁铬合金再掺入镍、钼、钛、锰等微量金属元素而制成。由于其金属性能良好，并且比其它金属耐锈蚀，制成的器具美观耐用。因此，越来越多的不锈钢也被用来制造厨具，并逐渐进入广大家庭。     

Synthesis and characterization of yttrium-aluminum-iron and yttrium-cerium-iron citric complexes

Fe-, Y-Fe-Al- and Y-Ce-Fe- citrates were synthesized in ethylene glycol （EG） medium under conditions similar to those used in the polymerized complex method. Their elemental composition, IR,^ 13C and ^1H NMR, X-ray photoelectron and Mossbauer spectra were studied, and formulae describing their composition were proposed. The complexes contained EG bonded as adduct and ester with citric acid ligand and did not contain ligands with deprotonated alcoholic groups. The complexes consisted of agglomerated spheres, 0.7-3 μm in diameter. The local composition of the products was established by energy dispersive X-ray microanalysis. The comparison of the number of the ligands, their average electrical charge and the esterification degree of mono-, di- and trimetallic complexes proved the mixed-metal nature of the species studied. The thermal decomposition of the complexes was studied and a general scheme of the processes taking place was proposed. Highly crystalline, phase homogeneous YaFe4AlO12 was produced after heating the respective complex at 1000 ℃. Ce-doped yttrium-iron garnet, similarly prepared, contained traces of CeO2.     

原子吸收法测定水样中铜锌铅镉的几种富集方法的探讨

原子吸收光谱法是分析水中痕量金属元素的重要手段之一。文章介绍了测定水样中Ｃｕ、Ｚｎ、Ｐｂ、Ｃｄ采用蒸发法、共沉淀、活性碳吸附，液一液苯取和离子交换法五种方法，认为离子交换法最好。