导数-双波长分光光度法测定镍

报告了应用一阶导数－双波长分光光度法测定钴、镍共存试样中的镍含量。在表面活性剂ＯＰ存在下形成Ｎｉ－５－Ｂｒ－ＰＡＤＡＰ三元配合物，对配合物吸光度的一阶导数曲线取波长组合５７２．５ｎｍ和５５３．５ｎｍ处的ｄＡ／ｄλ值进行测定，其Δ（ｄＡ／ｄλ）值对镍浓度的线性关系良好。对模拟样品和工厂排放水样进行了测定，结果说明该法灵敏度高，相对标准偏差为０．８％～２．２％，加标回收率为１００．２％～１０２．５％。     

丁二酮肟分光光度法测定硫酸镍生产废水中的镍

本文将丁二酮肟分光光度法应用于硫酸镍生产废水中镍的测定。以过硫酸铵作氧化剂，丁二酮肟为显色剂，在波长的４６５ｎｍ处测定硫酸镍生产废水中的镍。     

新试剂咪唑偶氮对甲基苯双波长标准加入法同时分光光度法测定钴镍研究

2- ( 2′-咪唑偶氮 ) - 4- (甲基苯 )与钴、镍均有灵敏的显色反应 ,但两个配合物的吸收光谱重叠 ,以测定钴的波长组合 ( 4 5 0 ,478nm)为测定波长对 ,以钴作标准加入组份 ,用双波长标准加入法同时测定低合金钢中的微量钴和镍 ,结果令人满意     

减空白值法在比色分析中对消除干扰颜色的应用

在比色分析的试液中,除被测定组份显色外,常存在各种干扰物质本身的颜色。如测定有色金属矿石、铜合金、镍电解槽中的杂质时,存在铜、铁、钴、镍、铬等有色离子的干扰。当测定有机物溶液中的金属杂质时,存在有机物本身黑褐色的干扰。按照常用的方法,需将这种有色离子分离,或加掩蔽剂结合为无色铬合物。或用萃取剂将测定组份从有色溶液中萃取分离。也有在测定标准曲线时加入同量干扰组份。有机物的颜色通常用硫酸消化方法将有机物破坏。所有应用以上这些方法,手续麻烦,费时间和试剂。本文研究对发色剂不起作用的本身有色干扰物质,选用适当的测量波长及用减     

分光光度法同时测定镀液中钴和镍

研究了在pH为8.0的氯化铵-氨水缓冲溶液中,以4-(2-吡啶偶氮)-间苯二酚为显色剂,应用双波长K系数分光光度法同时测定镀液中的钴和镍。钴以512 nm/482 nm为波长对,其线性范围为0.080~1.0μg/mL;镍以496 nm/526 nm为波长对,其线性范围为0.040~1.0μg/mL。此法用于合金镀液中钴和镍的同时测定,取得了较满意的结果。     

原子吸收光谱法测定镍粉中微量铁、钴和锌

本文叙述了应用原子吸收光谱法测定镍粉中微量铁、钴和锌。样品用硝酸溶解,以氯化铵作干扰抑制剂,消除了大量镍基体对测定铁和钴时的干扰,不需分离镍基体即可直接在空气——乙炔火焰中测定铁、钴和锌的含量。本方法测定灵敏度为铁:0.035μg/ml(1％吸收);钴;0.026μg/ml(1％吸收);锌:0.005μg/ml(1％吸收),回收率均在97～101％之间,相对误差均<2.0％,样品含量为50～100μg/g时,测定的标准偏差均<4.0μg/g,变异系数均<7.0％。     

流动注射催化光度法测定痕量钴的研究

本文研究了将流动注射分析与催化动力学光度法相结合应用于痕量钴(Ⅱ)的测定。基于钴(Ⅱ)对H_2O_2氧化邻苯三酚红的催化作用,建立了钴的流动注射催化分析法。在pH=8.9的硼砂-HCl介质中,反应温度为30±0.5℃时,在520nm波长处测定体系的吸光度的变化△A,1g(A_0/A)与溶液中钴(Ⅱ)的含量在0～50ng/mL范围内呈线性关系,检出限为2ng/mL,进样频率达40样次/h。对25ng/mL钴测定的相对标准偏差为1.25％(n=10)。应用于维生素B_(12)和镍盐中钴的测定,获得了满意的结果。     

对乙酰基偶氮胂与钴显色反应的研究

研究了对乙酰基偶氮胂与钴的显色反应条件及配合物的分光光度性质。在近中性介质中，钴与试剂形成１∶２的稳定配合物，其最大吸收波长在６２５ｎｍ处，表观摩尔吸光系数为２．４５×１０４Ｌ／ｍｏｌ·ｃｍ，钴浓度在０～３５μｇ／２５ｍｌ范围内符合比尔定律。方法用于ＶＢ１２中微量钴的测定，结果满意。     

原子吸收光谱法测定钌掺杂聚吡咯催化剂中高含量镍

提出了原子吸收光谱法测定钌掺杂聚吡咯催化剂中高含量镍的方法。确定了硝酸－高氯酸为混合溶剂,考查了２５种金属离子的干扰情况。镍的最灵敏吸收线波长为２３２．０ｍｍ,用空气－乙炔火焰测定高浓度镍时,用波长为３４１．５ｍｍ的次灵敏线,可提高测定精密度,又能使工作曲线的线性范围变宽,镍量在０￣１５０μｇｍｌ＾－１范围内符合比尔定律,此方法测定镍的检测限为０．１４μｇｍｌ＾－１,其加标回收率在１００．６％￣１     

锡钴枪色镀液中钴(Ⅱ)和锡(Ⅱ)的快速测定

利用分光光度法测定锡钴合金镀液中钴 (Ⅱ )和锡 (Ⅱ )的含量 ,探讨了测量波长和氧化剂的选择、焦磷酸钾的加入量、干扰元素等对测量结果的影响。结果表明 :本方法简便易行 ,准确度和精密度高 ,能满足生产中快速测定的要求。     

Catalytically Active Borohydride-Reduced Nickel and Cobalt Systems

Catalytic systems based upon nickel or cobalt compounds and sodium borohydride give a remarkable variety of products of wide application depending upon the reaction conditions. However, the information on these systems is widely scattered throughout the technical inorganic and organic literature. The object of this review, therefore, is to summarize and correlate what has been written about these catalytic systems and to stimulate practical industrial applications of them. Until recently, these studies were somewhat empirical in nature and we will therefore review in addition recent studies concerning the complex mechanism of Ni¹¹ and CO¹¹ reductions with borohydride ion. Particular attention will be given to recently published organoruckel and organocobalt complex compound structures (of as yet unexamined catalytic activity) prepared from the appropriate M¹¹ salts and sodium borohydride in the presence of a variety of ligands.     

EDTA容量法测定硫酸镍中的镍和钴

提出用氟化物、酒石酸和草酸溶液掩蔽Ｆｅ３＋、Ａｌ３＋、Ｃａ２＋、Ｍｇ２＋、Ｚｒ４＋、Ｔｉ４＋、ＲＥ３＋（稀土元素）和Ｍｎ２＋等，在ｐＨ＝１０的氨性介质中，用紫脲酸铵作指示剂，用Ｈ２Ｏ２完全氧化Ｃｏ２＋，用ＥＤＴＡ络合滴定法测定工业硫酸镍中的镍和钴。终点颜色变化敏锐、清晰。实际应用表明，本法具有简便、快速和准确度高等特点。     

原子吸收光谱法快速测定镍钴合金镀液中镍、钴的含量

建立了镍钴合金镀液中镍和钴含量的快速测定方法。对方法进行了选择、优化与验证,在优化的条件下,镍和钴元素的测定线性关系良好,相关系数均不小于0.9991,在高、中、低3个加标水平下,平均回收率为96%~102%,相对标准偏差均小于2%,镍和钴的方法检出限分别为0.009 mg/L和0.02 mg/L。该方法操作简单、准确灵敏、高效快捷,适用于镍钴合金镀液中镍和钴元素的快速检测。     

Oscillatory Behaviour During Ethane Oxidation Over Nickel and Cobalt Catalysts

Oscillatory behaviour during ethane oxidation over a nickel foil and a cobalt foil has been studied using on-line mass-spectrometry and video recording of the catalyst surface colour. It was demonstrated that during the oscillatory behaviour, periodic transitions of the catalyst surface from an oxidised state to a reduced state occurred together with a variation of the catalyst temperature. Simultaneous measurements of gas phase concentrations revealed that mostly CO₂ was produced over the oxidised state, while CO and H₂ production rates reached their maxima over the completely reduced surface. The comparison of the observed oscillations with known oscillations during methane oxidation over nickel and cobalt foils has been done. It was shown that the higher reducing ability of ethane was the reason of an increase of the frequency of the oscillations over both catalysts and a significant decrease of the temperature range of the oscillations over the cobalt foil.     

工业废液中镍钴的回收及应用研究

探索了从废液中回收镍钴在空气气氛下合成锂离子电池正极材料 L i Nix Co1 - x O2 的方法和工艺。结果表明 ,合成材料的充放电性能都比较好 ,L i Ni0 .3Co0 .7O2 在 6 0 0℃ 6 h→ 75 0℃ 16 h时制得的产物初始充电容量达到 15 4.938m Ah· g- 1 ,接近用分析纯的镍钴原料合成的正极材料 L i Ni0 .3Co0 .7O2 的首次充电容量 (15 6 .146 m Ah· g- 1 )。采用镍钴废液合成锂离子电池正极材料 ,化害为利 ,经济可行。     

工业硫酸镍除钴工艺研究

本实验主要研究黑镍[NiO(OH)]法除钴工艺，实验结果表明，在pH值5．0、用量系数2．0、反应时间2h及温度80℃条件下，用黑镍法除钴效果良好，除钴率达98．45％。     

Recovery of Nickel and Cobalt from Spent NiMH Batteries by Electrowinning

For nickel and cobalt recovery from spent NiMH batteries by electrowinning, the effect of different electrowinning parameters as boric acid concentration, temperature, current density, and pH were studied using different synthetic solutions. The optimized operational parameters were applied in an electrowinning test with a solution achieved by leaching the electrodes of NiMH batteries. The electrowinning tests were performed galvanostatically in a two‐compartment cell separated by an anionic membrane. A platinum/iridium‐coated titanium anode and a stainless‐steel cathode were used. A sodium sulfate solution served as anolyte. The results demonstrate the technical viability of nickel and cobalt recovery. The chemical composition of the obtained deposit presented high nickel and cobalt concentrations.     

镍钴镀液中镍、钴的快速测定

研究了以EDTA作显色剂，用双峰双波长光度法测定镍钴镀液中镍，钴含量的条件及其光度性质，实验结果表明，方法准确度和精密度较高，快速，简便，满足了实际生产中快速测定的要求。