X射线能谱法测定镍钴锰酸锂中镍、钴、锰三元素摩尔比

采用扫描电子显微镜-X射线能谱(SEM-EDS)及电感耦合等离子体发射光谱(ICP-OES)法对锂离子电池用镍钴锰酸锂中镍、钴、锰三元素间的摩尔比进行了测定。结果显示,在SEM-EDS测定过程中,如果将样品压成片状,选择合理的测定电压,同时对镍、钴谱线的重叠峰进行分峰拟合,以独立正态分布峰的面积换算各元素的摩尔百分比,SEM-EDS的测定结果与ICP-OES的测定结果具有较高的一致性,二者相对偏差不大于5%。镍、钴、锰三元素摩尔比的SEM-EDS测量值的相对标准偏差(n=3)不大于1%。     

电感耦合等离子体发射光谱法测定二次电池废料中锂、镍、钴、锰的含量

采用HCl-HNO 3溶解样品,使用电感耦合等离子体发射光谱(ICP-OES)法直接测定二次电池废料中含量低于20%的锂、镍、钴和锰的含量。选用元素最佳分析谱线和仪器合适的工作条件测定实际样品,实验结果表明共存元素对测定结果基本没有影响。相对标准偏差(n=11,RSD<2%)。通过不同方法的测试结果对比,同一样品的不同测定结果基本吻合,结果表明,方法操作快速简便,分析结果准确,能够满足二次电池废料中20%以下的锂、镍、钴和锰的测定。     

电感耦合等离子体发射光谱（ICP-OES）法测定二次电池废料中锂、镍、钴、锰的含量

采用HCl-HNO_3溶解样品,使用电感耦合等离子体发射光谱(ICP-OES)法直接测定二次电池废料中含量低于20%的锂、镍、钴和锰的含量。选用元素最佳分析谱线和仪器合适的工作条件测定实际样品,实验结果表明共存元素对测定结果基本没有影响。相对标准偏差(n=11,RSD<2%)。通过不同方法的测试结果对比,同一样品的不同测定结果基本吻合,结果表明,方法操作快速简便,分析结果准确,能够满足二次电池废料中20%以下的锂、镍、钴和锰的测定。     

电感耦合等离子体发射光谱（ICP-OES）法测定二次电池废料中锂、镍、钴、锰的含量

采用HCl-HNO_3溶解样品,使用电感耦合等离子体发射光谱(ICP-OES)法直接测定二次电池废料中含量低于20%的锂、镍、钴和锰的含量。选用元素最佳分析谱线和仪器合适的工作条件测定实际样品,实验结果表明共存元素对测定结果基本没有影响。相对标准偏差(n=11,RSD2%)。通过不同方法的测试结果对比,同一样品的不同测定结果基本吻合,结果表明,方法操作快速简便,分析结果准确,能够满足二次电池废料中20%以下的锂、镍、钴和锰的测定。     

三元素氢氧化物中镍钴锰含量的测定

采用仪器分析方法和化学分析方法相结合测定三元前驱体Ni0.33Co0.33Mn0.33(OH)2中镍、钴、锰主含量,分别采用电感耦合等离子体原子发射光谱(ICP-AES)内标法测定镍、钴、锰的摩尔比例,EDTA滴定法测定镍、钴、锰的摩尔总量,计算得到各元素的含量。通过优化实验条件,进行了准确度和精密度实验,加标回收率为99.2%~101%,相对标准偏差小于0.65%。方法准确、快速,已用于实际的检测工作中。     

电感耦合等离子体发射光谱(ICP-OES)法测定不锈钢中的硅、锰、磷、铬、镍、钼、铜

用HCl-HNO3混和酸溶解不锈钢样品,用钇为内标物质,使用标准样品绘制工作曲线,用电感耦合等离子体发射光谱(ICP-OES)法测定了不锈钢中的硅、锰、磷、铬、镍、钼、铜。在选定的操作条件下,对不锈钢标准样品按实验方法进行测定,标准样品的测定值与标准值基本吻合。元素质量分数在0.01%～0.10%时,相对标准偏差(n=11)RSD5%;质量分数大于0.10%,RSD 1%。同时测定不锈钢中的硅、锰、磷、铬、镍、钼、铜元素的含量,操作简单、快速、灵敏度高,结果令人满意。     

电感耦合等离子体质谱法(ICP-MS)测定镍钴锰三元素氢氧化物中铅

研究了用电感耦合等离子体质谱法(ICP-MS)测定镍钴锰三元素氢氧化物中铅含量的测定方法。选择了仪器的最佳测量条件、元素测定的质量数,进行了基体元素的干扰等实验。方法测定结果准确、可靠,测定下限小于0.00005%,样品加标回收率在99.2%~101.0%。方法的建立为控制镍钴锰三元素氢氧化物中铅提供了检测依据。     

电感耦合等离子体原子发射光谱法测定钴铬钼合金中锰、铁、镍、钼、钨

提出了用电感耦合等离子体原子发射光谱法测定钴铬钼合金中锰、铁、镍、钼、钨的含量。用盐酸和硝酸溶解样品,选择波长为216.556,257.610,204.598,259.940,207.911 nm 5条谱线依次作为测定镍、锰、钼、铁和钨的分析线。方法用于钴铬钼合金标准样品(C112X)分析,加标回收率在96.0%~105.0%之间,相对标准偏差(n=9)在1.1%~2.0%之间。     

微柱高效液相色谱法测定环境样品中的铁、钴、镍、铜、锌、锰

研究了用 2-(2-喹啉偶氮 )-间苯二酚 (QAR)为柱前衍生试剂 ,以WatersXterraTM RP18(1 .0×5 0mm ,2. 5 μm)微柱为固定相 ,60 %的甲醇 (内含 0 . 5 %的醋酸 )为流动相 ,高效液相色谱分离、二极管矩阵检测器测定铁、钴、镍、铜、锌和锰的方法。根据信噪比 (S N =3 )得各金属离子的检测限分别为 :铁3 μg L、钴 4μg L、镍 2 μg L、铜 4μg L、锌 5 μg L、锰 8μg L ,方法用于环境样品中痕量铁、钴、镍、铜、锌、锰的测定 ,相对标准偏差在 1 . 6%～ 3 . 5 %之间 ,标准回收率为 93 %～ 1 0 7%。     

原子吸收法测定矿石中铜、镍、钴

铜、镍、钴常伴生于许多综合矿床中,而钴常较其它二元素含量低1-2数量级,在原子吸收测定中,灵敏度顺序常为铜>钴>镍。为要连续测定,就需相应提高镍、钴的测定灵敏度。本文试验了在操作条件下:(1)加入一定量乙醇可提高三元素的灵敏度,降低三者测定灵敏度的差异,扩大了测定范围。(2)加入一定量的K、Na、Ca、Mg、Fe、Al、Ti、Mn、Cr、Pb、Zn、Cu、Ni、Co、WO_3、MoO_3、对铜、镍、钴测定均无明显影响,仅硅使吸收值下降较多。(3)3 ％以内的盐酸、硝酸、硫酸介质均无影响且随着酸度增     

电感耦合等离子体发射光谱(ICP-OES)法测定镍钴锰酸锂中主元素含量

建立了采用电感耦合等离子体发射光谱(ICP-OES)法测定锂电池正极材料LiNi_(1-x-y)Co_xMn_yO_2中Ni、Co、Mn元素含量的方法。通过调整观测方向,选用合适稀释倍数,采用对应元素次灵敏线对高含量Ni、Co、Mn元素进行测定,结果表明,方法具有很高的准确度和精密度,加标回收率为97.4%～103%,相对标准偏差1%,适用于工业化生产中的质量分析。     

ICP-OES测定醋酸酯淀粉中10种元素含量

醋酸酯淀粉样品经微波消解后,采用电感耦合等离子体发射光谱（ICP-OES）法测定其中钾、钙、钠、镁、铜、铁、锌、锰、磷、镍等10种元素含量.方法线性范围宽,线性相关系数r大于0.999 4,回收率为90.0%~106.7%,RSD小于3.9%.方法具有操作简单、快速、准确、可靠等优点,在醋酸酯淀粉分析中,取得了令人满意的结果.检测结果表明：醋酸酯淀粉中含有丰富的钙元素,磷、钾、钠元素含量较丰富,含有微量的镁、铜、铁、锰、镍等元素.     

Monitoring of inorganic species distribution in water and sediments of Aso river

Analytical results are reported for the determination of inorganic species in water and sediments sampled in the Aso river ecosystem. The species determined are Cd, Co, Cr, Cu, Fe, Mn, Ni, Zn, Hg, F-, NO3-, SO4--, Na, K, Ca, Mg, NH4+ in water, and Cd, Co, Cr, Cu, Fe, Mn, Ni, Zn, Hg in sediments. For all the elements, in addition to detection limits, precision and accuracy are given: the former, expressed as relative standard deviation (Sr), and the latter, expressed as relative error (e), were good, being in all cases lower than 6%.     

Spatial and temporal distribution of inorganic species in water and sediments of the Tronto River ecosystem

Analytical results are reported for the determination of inorganic species in water and sediments sampled in the Tronto river ecosystem. The species determined are Cd, Co, Cr, Cu, Fe, Mn, Ni, Zn, Hg, F, NO3-, SO4-, Na, K, Ca, Mg, NH4+ in integrated water, and Cd, Co, Cr, Cu, Fe, Mn, Ni, Zn, Hg in sediments. For all the elements, in addition to detection limits, precision and accuracy are given: the former, expressed as relative standard deviation (Sr), and the latter, expressed as relative error (e), were good, being in all cases lower than 5%.     

Synthesis and characterization of Li[(Ni0.8Co0.1Mn0.1)0.8(Ni0.5Mn0.5)0.2]O2 with the microscale core-shell structure as the positive electrode material for lithium batteries

The high capacity of Ni-rich Li[Ni(1-x)M(x)]O(2) (M = Co, Mn) is very attractive, if the structural instability and thermal properties are improved. Li[Ni(0.5)Mn(0.5)]O(2) has good thermal and structural stabilities, but it has a low capacity and rate capability relative to the Ni-rich Li[Ni(1-x)M(x)]O(2). We synthesized a spherical core-shell structure with a high capacity (from the Li[Ni(0.8)Co(0.1)Mn(0.1)]O(2) core) and a good thermal stability (from the Li[Ni(0.5)Mn(0.5)]O(2) shell). This report is about the microscale spherical core-shell structure, that is, Li[Ni(0.8)Co(0.1)Mn(0.1)]O(2) as the core and a Li[Ni(0.5)Mn(0.5)]O(2) as the shell. A high capacity was delivered from the Li[Ni(0.8)Co(0.1)Mn(0.1)]O(2) core, and a high thermal stability was achieved by the Li[Ni(0.5)Mn(0.5)]O(2) shell. The core-shell structured Li[(Ni(0.8)Co(0.1)Mn(0.1))(0.8)(Ni(0.5)Mn(0.5))(0.2)]O(2)/carbon cell had a superior cyclability and thermal stability relative to the Li[Ni(0.8)Co(0.1)Mn(0.1)]O(2) at the 1 C rate for 500 cycles. The core-shell structured Li[(Ni(0.8)Co(0.1)Mn(0.1))(0.8)(Ni(0.5)Mn(0.5))(0.2)]O(2) as a new positive electrode material is a significant breakthrough in the development of high-capacity lithium batteries.     

Inorganic species in water and sediments of the Lamone and Marzeno rivers ecosystem

Analytical results are reported for the determination of inorganic species in water and sediments sampled in the Lamone and Marzeno rivers ecosystem. The species determined are Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, Zn, Hg, F-, Cl- Br-, NO3-, SO4--, Na+, K+, Mg++, Ca++, NH4+ in superficial water, and Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, Zn, Hg in sediments. For all the elements, in addition to detection limits, precision and accuracy are given: the former, expressed as relative standard deviation (s(r)), and the latter, expressed as relative error (e), were good, being in all cases lower than 6%.     

Pulverized Banana Peel as an Economical Sorbent for the Preconcentration of Metals

A procedure for the determination of trace levels of Cd, Co, Cr, Fe, Mn, Ni, and Pb by flame atomic absorption spectrometry using a column preconcentration system is described in which the metals were adsorbed on pulverized banana peel, an economically and environmentally acceptable sorbent. In the optimization procedure, five variables (sample pH, mass of biosorbent, type of eluent, sample flow rate, and volume) were optimized and the capacity of the biosorbent was established. Under the optimized conditions, the detection limits of the method were 2.4, 27.0, 49.4, 31.1, 6.7, 29.6, and 46.2 µg L^?1 for Cd, Co, Cr, Fe, Mn, Ni, and Pb, respectively. The precision, expressed as relative standard deviation, was less than 4% based on twelve measurements. The recoveries were 81.1% (Cd), 91.4% (Co), 87.2% (Cr), 90.1% (Fe), 88.0% (Mn), 94.1% (Ni), and 93.2% (Pb) under the optimum conditions (pH; 9, sample flow rate; 3 mL min^?1, mass of biosorbent; 200 mg; eluent; 1 mol L^?1 nitric acid, preconcentration factor; 10). The sorption capacity of pulverized banana peel was 15.12, 28.85, 32.70, 30.44, 30.94, 28.97, and 8.21 µmol per gram of adsorbent for Cd, Co, Cr, Fe, Mn, Ni, and Pb, respectively.     

茶叶中锰、铁、锌、铬等10种微量元素的快速测定

茶叶样品经粉碎干燥后,以硝酸-高氯酸混合液进行消解处理,火焰原子吸收分光光度法测定了K、Ca、Na、Mg、Fe、Mn、Cu、Zn、Ni、Cr的含量。结果表明,回收率在89.30%～103.20%之间,相对标准偏差小于10%。方法简单、快速、经济,结果可靠。