共查询到19条相似文献,搜索用时 328 毫秒
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ICP-MS法测定延胡索中5种金属元素的含量 总被引:1,自引:0,他引:1
采用浓硝酸-高氯酸消解处理样品,电感耦合等离子体发射光谱-质谱法(ICP-MS)测定延胡索药材中铅、铬、镉、铜、锰等5种金属元素含量。结果表明,5种元素校正曲线线性关系良好,各元素的回收率在98.9%~101.3%之间。该方法灵敏度高,操作简单、快速,结果准确,是延胡索药材中金属元素测定的理想方法。 相似文献
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为准确快速地检测铜尾矿中的铜铅锌银,选择电感耦合等离子体原子发射光谱仪(ICP-OES)对其进行测定,对实验条件、方法检出限、精密度和加标回收率做了研究。铜尾矿样品经氢氟酸-盐酸-硝酸分解后,用ICP-OES同时测定铜铅锌银4种元素,方法的检出限为0.000 62~0.003 5μg·m L-1,精密度为0.67%~3.08%,回收率为90.0%~110.0%。 相似文献
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ICP-AES同时测定锑矿石样品中的5种伴生元素 总被引:1,自引:0,他引:1
文章针对锑矿石中锑元素易水解易挥发的特性探讨了用硝酸分解有机物与硫化物,逆王水低温溶解样品,电感耦合等离子体发射光谱对锑矿石中Cu 324.754 nm、Pb 220.353 nm、Zn2 13.856 nm、Sb 231.147 nm、As 189.042 nm同时测定的仪器工作条件及各元素的分析谱线背景校正方法,基本解决了基体干扰和待测元素之间的干扰问题。建立的方法用于锑矿石样品中铜铅锌锑砷的分析,方法检出限为铜0.0002%、铅0.0014%、锌0.0001%、锑0.002%、砷0.003%,相对标准偏差(RSD,n=12)1%,加标回收率为97.2%~103.1%。通过与其它分析检测方法比对,结果吻合,且可在线同时测定多种元素,检测线性范围宽,快速简捷,准确度高。 相似文献
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The anodic behaviour of as-cast and homogenized binary copper-based alloys with Zr, Cr, Al, Si and Sn in 50% citric acid solution has been studied by the potentiostatic method. At positive potentials all as-cast and homogenized alloys with low additions of alloying elements behave in a manner similar to that of copper. However, there is an essential difference between the polarization curves for copper with 8% Al and those for copper. The differentiation ratio of dissolution rates and optimum values of dissolution potentials were calculated using the data for as-cast alloys. The highest differentiation ratio was found for the Cu-8% Al alloy. On the basis of calculated potentials, a number of experiments were performed in order to separate the phases. 相似文献
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探讨不同制备工艺条件对Cu基合成甲醇催化剂性能的影响。分别采用反加共沉淀法、反加共沉淀法+助剂、并流法和并流法+助剂制备了4种催化剂样品,考察催化剂性能的变化,并对助剂在催化剂合成过程中所起的作用进行推测,采用X射线衍射、低温N2吸附和扫描电子显微镜等对催化剂进行表征。结果表明,Cu基甲醇合成催化剂制备过程中加入助剂可以调整催化剂的孔径分布和表面组分分布,催化剂组成确定后,催化剂制备过程采用并流法+助剂制备的样品,孔径分布更合理,ZnO组分晶粒尺寸较小,Cu和Zn组分间相互接触的几率更大,催化剂性能更好。 相似文献
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研究了用EDTA络合滴定测定锡铅焊料中高含量镉的方法。对测定条件、溶液酸度、共存离子干扰情况、加标回收率、方法的准确度和精密度考察进行了较全面的讨论。本法可用于锡铅焊料中10%~20%(质量分数)镉的测定。 相似文献
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The anodic behaviour of as-cast and homogenized binary copper-based alloys with Zr, Cr, Si, Sn and Al in 65% phosphoric acid was studied by a potentiostatic method. The biggest difference in the anodic behaviour between as-cast and homogenized samples was found for Cu-8% Sn and Cu-8% Al alloys. 相似文献
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利用Cu基ZnO薄膜紫外光催化降解水体中的有机污染物是一项非常有前景的水处理技术,本文利用电化学沉积方法,在锌盐的水溶液中沉积制备Cu基ZnO薄膜,并以较难降解的偶氮类有色化合物甲基橙是为例,紫外光照射下,用制备好的Cu基ZnO薄膜降解水中甲基橙.结果表明有很好的催化降解效能.该技术还没有得到广泛应用,有待于进一步完善... 相似文献
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采用并流共沉淀法,在微波辐射老化的条件下,制备了CuO/ZnO/Al2O3/X(X=ZrO2,Fe2O3,MnO2)四元铜基合成甲醇催化剂,考察了第四组分元素对催化剂前驱体物相组成及浆态床合成甲醇性能的影响。通过XRD,TG,EDS等对催化剂及其前驱体的微观结构进行了表征。结果发现,助剂Zr、Fe、Mn的加入均不同程度的促进了Cu,Zn组分间的相互作用,有利于活性物相绿铜锌矿及锌孔雀石的生成。与CuO/ZnO/Al2O3三元催化剂相比,助剂ZrO2、Fe2O3、MnO2的加入均提高了催化剂合成甲醇的活性。其中ZrO2对铜基催化剂活性影响较大,CO转化率从43.51%提高到了59.18%,提高了36%;甲醇时空收率从256.9 mg/(gcat·h)提高到了372.8 mg/(gcat·h),提高了45%。 相似文献
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《分离科学与技术》2012,47(3):379-385
Abstract Mesityl oxide [(CH3)2C[dbnd]CHCOCH3] was used for the liquid-liquid extraction of antimony. It can be quantitatively extracted from 3 M hydrochloric acid within 10 sec of equilibration with 15 ml of mesityl oxide. The metal from the organic phase was stripped with 10 ml of water and was determined photometrically as its iodide complex at 425 mm. The probable composition of the extractable species at 3 M hydrochloric acid was either SbCl3 · 3MeO or [HSbCl4 (MeO)3] where MeO is mesityl oxide. The method is simple, rapid, and selective, as it was possible to separate antimony from a large number of elements which are associated with it in alloys and minerals. The method is applicable for the analysis of antimony in solder. The standard deviation is ± 1%. 相似文献