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火焰原子吸收光谱法连续测定锌精矿中锑钴镍 总被引:4,自引:0,他引:4
程键 《理化检验(化学分册)》2006,42(7):576-576,578
国标方法测定锌精矿中锑和镍,采用酒石酸王水溶样,萃取分离锌,比色法测定;钴的测定没有国标方法。比色法测定流程长,使用毒性有机物,工作强度大,有采用X-射线荧光光谱法测定,也有采用火焰原子吸收光谱法测定锑、钴和镍,但需将锑与钴、镍分开测定。本法用氟化氢铵、酒石酸、逆王水溶样可实现锑、钴和镍在同份样品溶液中快速连续测定,方法快速稳定、重现性好。 相似文献
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以结晶紫与亚硝基R盐吸光光度法测定镍 总被引:2,自引:2,他引:2
在氨性(PH9-9.5)条件下,镍(Ⅱ)与结晶紫及亚硝基R盐反应形成紫色络合物,表观摩尔吸光系数ε536=2.29×10^5L,mol^-1,镍浓度在0.0120mg/L范围内遵守比耳定律,组成摩尔比为Ni:CV:R=1:2:1,本法快速,为光度测定微量镍的高灵敏方法之一,用于土壤、人发等试样中镍的测定、结果满意。 相似文献
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钯镍钛合金中镍量的快速测定 总被引:1,自引:0,他引:1
在pH10-11的氨-氯化铵介质中,以氨水掩蔽钯,三乙醇胺掩蔽钛,以紫脲酸铵作指示剂,用Na2EDTA标准溶液直接滴定测定镍。针对钛的易水解性,提出采用先加少量过氧化氢与钛生成不易水解的络合物,再加三乙醇胺掩蔽的方法,可有效地掩蔽少于8mg的钛,其它共存离子可通过加入酒石酸钾或氟化物进行掩蔽。方法快速,准确,选择性,用于钯镍钛合金中镍的测定,结果满意。 相似文献
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电导滴定法测定镍的含量 总被引:3,自引:0,他引:3
由电导滴定法确定终点,在氨性介质中用丁二酮肟乙醇溶液滴定镍的含量,采用硫脲掩蔽Cu(Ⅱ),用H2O2将Mn(Ⅱ),Co(Ⅱ)氧化成Mn(Ⅳ)和Co(Ⅲ)消除干扰,其它金属离子对测定没有干扰,此法的测定结果与丁二酮肟重量法接近,且不受溶液的颜色、浊度的影响,具有准确、快速、干扰少的特点,适用于化学镀镍溶液,电镀镍和镍合金中镍的测定。 相似文献
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用丁二酮肟光度法测定Al-Ni10-Cu20合金中的镍。在碱性介质中并有氧化剂存在下,加入EDTA阻碍铜与丁二酮肟生成暗蓝色络合物,从而消除了铜对镍的干扰,使镍离子与丁二酮肟充分反应生成可溶性酒红色络合物,然后用光度法测定镍含量。该方法简便易行,用于Al-Ni10-Cu20合金中镍的测定,结果较准确。 相似文献
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镀锌镍铁合金溶液中硫酸镍的快速测定 总被引:4,自引:0,他引:4
郭崇武 《理化检验(化学分册)》1995,31(3):180-180
镀锌镍铁合金溶液中硫酸镍的测定,过去采用了二酮肟镍重量法,过程冗长,分析费时。本文制定了丁二酮肟光度法,用于镀液中硫酸镍的快速测定。对于镍铁体系中镍的光度法测定,过去采用酒石酸钾钠掩蔽铁,但酒石酸铁络合物的颜色与丁二酮肟镍相近,影响镍的测定。本文选用三乙醇胺掩蔽铁,使铁在碱性溶液中生成无色络合物,有效地消除了铁对测定镍的影响。以往的经验认为,丁二酮肟与镍离子的显色速度 相似文献
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翟步英 《理化检验(化学分册)》2000,36(9):420-420,422
铜基合金中高含量镍的分析 ,一般采用电解分离铜基 [1] ,然后 EDTA滴定镍。此方法工作量大 ,分析周期长。文献 [2 ]介绍一种快速测铜基中镍的方法 ,该方法加掩蔽剂消除铜的干扰 ,也是用 EDTA测定镍。目前原子吸收法测定合金及金属中的镍[3 ,4 ]已见报道。作者为了减少加入物带入的杂质 ,缩短分析周期 ,拟定了用硝酸分解样品 ,以铜作标准曲线的底液 ,火焰原子吸收法直接测定样品中镍。本法快速、方便 ,结果准确 ,样品的相对标准偏差为 0 .8% ,标准曲线的相关系数 r=0 .9997。1 试验部分1 .1 仪器与试剂Pye- Unican90 0 0型原子吸收分光… 相似文献
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EDTA滴定法直接测定镍铁中镍量 总被引:3,自引:0,他引:3
测定常量镍常采用丁二酮肟重量法或氨性分离-EDTA滴定法.但两者分析流程均较长而不适于快速分析.EDTA滴定法测定镍的应用已较为广泛[1-3].本工作采用氟化钠掩蔽铁、铝,六偏磷酸钠掩蔽锰,在过量的EDTA存在下,于pH约4.6的乙酸-乙酸盐缓冲介质中,以PAN作指示剂,用硫酸铜标准溶液返滴定过量EDTA的方法直接测定镍铁中镍.方法简便,分析结果满意. 相似文献
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赖红梅 《理化检验(化学分册)》2001,37(9):414-415
文中拟定了高钡合金中钡含量的快速测定方法。该法以三乙醇胺 (TEA)、酒石酸钠(Tart)联合掩蔽铁、铝的干扰 ,在 pH >12的体系中 ,用EGTA滴定 ,求得钡的含量。方法简便、快速 ,结果准确可靠。 相似文献
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张菊琴 《中国无机分析化学》2018,8(5):45-47
本文针易电离元素铷,采用原子吸收光谱法和电感耦合等离子体多元素测定的两种方法进行了探讨。三酸溶样的原子吸收法需要加入硫酸钾做电离抑制剂,操作繁杂但检出限更低,线性范围窄;四酸溶样的等离子体光谱法方法简便快速,适合大批量多元素快速测定。两种方法结合使用可实现大批量样品中铷的快捷、简单、准确检测。 相似文献
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A selective analytical extraction method for rapid successive complexometric determination of thorium(IV) and uranium(VI) in sulphuric acid media is described. The method is based on the extraction of thorium and uranium from sulphuric acid media with N-butylaniline or N-benzylaniline in chloroform. Both thorium and uranium are selectively and quantitatively extracted in the presence of ascorbic acid and EDTA. Most cations and anions do not interfere. The reduction of uranium(VI) with sodium dithionite at room temperature is rapid and quantitative and superior to that with ascorbic acid, which reduces uranium(VI) in boiling solution. The method is simple, rapid and accurate, and the experimental conditions are not highly critical. 相似文献
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A rapid spectrophotometric method for the determination of phosphorus in rocks and minerals is described. The sample solution is prepared by treatment with hydrofluoric and aqua regia at room temperature. Unreacted fluoride ions are complexed with boric acid. As fluoride ions do not have to be removed by heating, the method is rapid and avoids the use of platinum ware. 相似文献
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Paul Baily Terence A. Kilroe-Smith Helen B. Röllin Bertie Goldstein 《Microchemical Journal》1979,24(2):192-198
A rapid and convenient method for the determination of collagen in tissue is presented. The simple and reproducible method for hydrolysis allows many specimens to be processed simultaneously, and the rapid spectrophotometric determination of hydroxyproline, the presumptive index for collagen, ensures accurate and precise results. 相似文献
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A method for creating rapid crack propagation in pressurized pipes under slow static loading using modified S4 apparatus is described. In the development of the method a complexity involved with dynamic loading in the S4 test (ISO 13477) is eliminated by the use of a displacement controlled static loading machine. The experimental system consisted of an universal testing machine, a low compliance wedge loading device, notch tip quenching apparatus and a pipe specimen where a through thickness hole is drilled to accommodate the wedge loading device. The pipe specimen is made in such a way that a section containing a hole is free from the internal pressure, while the rest of the specimen is made to carry the internal pressure which would eventually drive the unstable crack along the pipe axis. The idea of such rapid crack initiation under static loading was derived from the concept of time-temperature equivalence, where impact loading may in part be simulated by lowering the temperature at the site of rapid crack initiation. The details of the method for rapid crack propagation under static loading are described and the correlation of the results to rapid crack propagation obtained by ISO 13477 is illustrated. The two methods were shown to compare quite well in terms of critical pressure determination and the details regarding normalized rapid crack length versus the internal pressure curve as well as the crack propagation pattern. 相似文献