差分脉冲极谱法测定苯胺中微量硝基苯

建立了测定苯胺中微量硝基苯的差式微分脉冲极谱法。试验发现硝基苯在-0.57V(vs.Ag/AgCl)处有一个良好的差分脉冲极谱峰。硝基苯质量浓度在1～600μg/mL的范围内,质量浓度与差分脉冲极谱峰的峰高呈线性关系。此法简便、快速、灵敏,结果准确。     

单扫描极谱法快速测定胱氨酸的研究及应用

在pH 9.6的H3BO3-NaOH介质中,胱氨酸于-0.56 V(vs.SCE)处产生一灵敏的吸附还原波。用于胱氨酸的测定,波高与0.8~10μmol/L的胱氨酸有线性关系,检测限为0.4μmol/L。许多氨基酸在较高浓度共存情况下不干扰胱氨酸的测定。应用该法测定了人发及胱氨酸片剂中胱氨酸的含量。     

Competitive removal of Pb2+, Cd2+, and Zn2+ by poly(acrylamide‐co‐maleic acid) hydrogels/differential pulse polarographic determination

Poly(acrylamide‐co‐maleic acid) [P(AAm/MA)] hydrogels, with various compositions, were prepared from ternary mixtures of acrylamide (AAm)/maleic acid (MA)/water by using ⁶⁰Co γ‐rays. The effect of composition of these hydrogels, on the competitive removal of Pb²⁺, Cd²⁺, and Zn²⁺ ions from aqueous solution, was investigated. The hydrogel compositions and their adsorption behaviors were determined by use of differential pulse polarography, a very sensitive electroanalytical technique. It was observed that the external stimuli of pH, temperature, and ionic strength have an important role on the adsorption. The increments of MA content in P(AAm/MA) hydrogels caused a significant increase in the adsorption these ions. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 94: 2401–2406, 2004     

洛伐他丁的电化学行为研究

用线性扫描极谱法考察了洛伐他丁的极谱行为,旨在建立一种简单、快捷和灵敏的测定洛伐他丁含量的分析方法。实验采用三电极系统（滴汞电极为工作电极,Pt电极为对电极,饱和甘汞电极为参比电极）,以1∶1的0.8 mol/L NH4Cl和0.8 mol/L NH3.H2O混合溶液为底液,发现洛伐他丁在-1.62 V左右有一个灵敏的二阶导数极谱峰,其峰高与洛伐他丁溶液在0.50~7.00μg/mL范围内呈线性关系。洛伐他丁的加标样品回收率在98.0%~104.2%之间,最小检测限为0.370μg/mL。同时考察了表面活性剂和共存的金属离子Al3＋、Cu2＋、Fe3＋、pb2＋对洛伐他丁极谱波的影响。利用建立的洛伐他丁含量的极谱分析方法对样品中洛伐他丁含量进行了测定,结果表明所建立的洛伐他丁极谱分析方法快速、准确,具有一定实用价值。     

酚酞示波极谱及其在痕量钌催化分析中的应用

在稀盐酸介质中酚酞于－０．５５Ｖ处产生一灵敏的单扫描示波极谱波。基于在稀盐酸介质中及１００℃下，痕量Ｒｕ（Ⅲ）对高碘酸盐氧化酚酞这一缓慢反应的强烈催化作用，用自来水冷却中止反应，采用单扫描示波极谱波研究Ｒｕ这一新的指示反应，建立检出限和测定范围分别为０．０５ｎｇ／ｍｌＲｕ的催化反应－示波极谱分析新方法，并用于实际试样分析，结果较好。     

铟(Ⅲ)—邻苯二酚紫配合物吸附波的研究

在含有0.3mol.L~(-1)HAC-NH_4AC(pH=5.8)和2.0×10~5mol.L~(-1)PV 溶液中,可得到铟(Ⅱ)-PV 配合物极谱波。峰电位在-0.69V(VS.SCE)处,其导数峰高与铟(Ⅲ)在0.020～0.400mg.L~(-1)范围内的浓度有良好的线性关系,最低检出限为0.005mg.L~(-1)。研究了该波的机理,证明是一种配合吸附波,并应用于轴承镀层中铟含量的测定。     

Chemical amplification — A novel approach to ultratrace analysis

The lowest concentration that can be estimated with 100% error in chemical analysis by instrumental technique is referred to as detection limit. It is equal to the ratio of twice the background signal to the magnitude of analytical signal corresponding to a concentration of unity. Detection limit (dl) could be improved if the analytical signal alone could be selectively amplified without affecting the background. It is shown that this could be achieved by chemical amplification. Atomic amplification of two or three orders of magnitude could be obtained by combining two chemical amplifications in series. It is demonstrated that by using heteropoly acid formation as the first amplification reaction and determining molybdenum in the heteropoly acid by catalyticdc polarographic wave, a detection limit for the hetero atom of less than a ppb can be obtained. It is pointed out that the approach of selectively amplifying analytical signals by tandem chemical amplification reactions makes it possible to perform ultratrace analysis (ppb level) with classical instrumental analytical techniques which havedl at ppm level.     

极谱法测定硼的应用研究

提出了几种物料中0.0×%~×%范围内硼的极谱分析方法,所拟方法快速简便,效果良好。     

示波极谱法测定糖尿病人头发中的铜、铅、镉、锌、铬的含量

采用HNO3-HClO4消化、HCl溶解头发样品,应用单扫描示波极谱法测定了糖尿病人头发中的Cu、Pb、Cd、Zn、Cr的含量,并把结果与健康人的含量进行了对比分析.     

核级UO_2及U_3O_8中铌的萃淋树脂分离－催化极谱法测定

样品溶液经ＣＬ－５２０９萃淋树脂在２ｍｏｌ／Ｌ硝酸介质中分离铀后，用催化极谱法测定铌。铌在０．８％Ｈ２ＳＯ４－０．０５ｍｏｌ／Ｌ酒石酸－２％ＫＳＣＮ－０．０８％抗坏血酸－０．０００４％聚乙烯醇底液中，于－１．３Ｖ处呈现络合催化氢波（ｖｓ．ＳＣＥ）可用二次导数测定。铌峰电流与浓度（０．００５～０．０３μｇ／ｍＬ）有线性关系。称样０．１ｇ时，铌的测定下限为０．５μｇ／ｇＵ、６次测定相对标准偏差＜１５％，加入回收率为９１％～１１９％。