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双波长K系数—标准加 入分光光度法同时测定重油中的钴,镍 总被引:3,自引:0,他引:3
本文提出了一种同时测定两组分的新方法,即双波长K系数-标准加入分光光度法。该法同时进行两组的标准加入,以两个组分的最大吸收波长为测定波长,又互为参比波长,以一套吸光度数据同时完成两个组分的测定。 相似文献
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分光光度法测定高铁、高镁红土镍矿中的镍 总被引:1,自引:0,他引:1
利用丁二酮肟分光光度法测定红土镍矿中的镍。研究了波长、NaOH、显色剂及氧化剂等试剂用量对吸光度的影响,得出了较佳的实验条件;同时通过加标回收验证了方法的可靠性,回收率为101.1%,相对标准偏差RSD(n=10)为0.54%。实验证明了方法准确、可靠,是一种快速测定红土镍矿中镍含量的便捷方法。 相似文献
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双波长和三波长分光光度法同时测定乙醛酸和乙二醛 总被引:10,自引:0,他引:10
利用醛基的成肟反应,用双波长法,三波长法同时测定乙醛酸、乙二醛的含量。它们的回收率分别为100.9%-102.3%(n=6)和96.8%-103.0%(n=11)。 相似文献
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《Analytical letters》2012,45(7):1433-1440
ABSTRACT Niobium was determined by flow injection spectrophotometry at 393 nm after extraction of ethylene-bis(triphenylphosphonium)thiocyanatoniobate(V) into chloroform. The effects of diverse ions are reported. The system has been applied to the determination of niobium in steels by the method of standard additions. 相似文献
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A novel sensitive and simple method for rapid and selective extraction, preconcentration and determination of iron (as its
bathophenanthroline complex) and copper (as its neocuproine complex) using octadecyl silica cartridges and dual wavelength
spectrophotometry is presented. The dual wavelength method (533 nm for the iron-bathophenanthroline and 454 nm for the copper-neocuproine
as the analytical wavelength) is used to eliminate spectral interferences. Extraction efficiency and the influence of flow
rates of sample solution and eluent, pH, amount of neocuproine, bathophenanthroline and hydroxylamine hydrochloride, type
and least amount of eluent for elution of iron and copper complexes from cartridge, break-through volume and limit of detection
are evaluated. The effects of various cationic and anionic interferences on percent recovery of iron and copper are also studied.
Extraction efficiencies >95% are obtained by elution of cartridges with minimal amount of organic solvent. Iron and copper
were determined in the range of 3–100 ng mL−1. The limits of detection are 0.98 and 1.13 ng mL−1 for iron and copper, respectively. The proposed method is applied successfully to the determination of both analytes in river,
tap and well water samples.
Author for correspondence. E-mail: yyamini@modares.ac.ir
Received September 18, 2002; accepted December 12, 2002
Published online May 5, 2003 相似文献
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在弱酸性介质中和氯胺T存在条件下,CN-可与异烟酸-硫代巴比妥酸形成一蓝色染料,该染料具有两个吸收峰,分别位于642 nm和525 nm处,且其在两波长处的吸光度之和△A(△A=Aλ1+Aλ2)与氰化物含量在一定的范围内呈良好的线性关系,据此建立了测定水样中微量氰化物的异烟酸-硫代巴比妥酸双波长叠加分光光度法.该法氰化... 相似文献