冠心病与微量元素锌铜硒

以临床典型冠心病案为例，探讨了中医中药传统和微量元素关系，重点讨论了微量元素锌、铜、硒与冠心病的病因病理和治疗的关系。     

用色谱膜法富集阴极吸附溶出伏安法测定空气中的镍铜铅镉

在色谱膜池中,用１．０ｍｏｌ／ＬＨＮＯ３溶液吸收富集空气中的镍、铜、铅和镉,以８－羟基喹啉络合物吸附阴极溶出伏安法测定其含量。在ｐＨ７．５０的醋酸铵溶液中,８－羟基喹啉与镍、铜、铅及镉络合物的峰电位分别为－０．３８、－０．５２、－０．６２和－０．８０Ｖ,线性范围分别为０．５～３００、０．３～５０、０．０８～１００和０．０２～１００ｎｍｏｌ／Ｌ。     

2．5次微分溶出伏安法测定水中痕量铜

报告了测定痕量铜的一种新方法。在０．０１ｍｏｌ／ＬＨＡｃ－ＮａＡｃ溶液中，铜和乙醛酸缩氨基硫脲（ＧＡＴＳＣ）形成的配合物产生一很灵敏的还原峰，峰电位是－０．３３Ｖ（ｖｓ·ＳＣＥ），铜的浓度在１．０×１０－８～２．０×１０－６ｍｏｌ／Ｌ范围内成直线关系，检测限为３．０×１０－９ｍｏｌ／Ｌ，该法用于测定水中痕量铜，结果令人满意。     

Voltammetric Determination of Platinum in Plant Material

A very sensitive procedure for the determination of platinum in hydroponically cultivated plant samples (Sinapis alba L and Lolium perenne) is presented. A microwave digestion with HNO₃, HClO₄ and HCl acids with additional UV irradiation is followed by the platinum determination by adsorptive stripping voltammetry at hanging mercury drop electrode. The influence of HNO₃ acid on voltammetric determination of platinum is discussed. For validation of the obtained results the recovery of Pt was examined and the Pt determination by ICP MS was carried out. The highest platinum amounts were found in the roots of the plants, nevertheless the effective transport of platinum to the steams and leaves was also observed.     

毛细管电泳单脉冲伏安测定重金属铜铅锌镉

以毛细管为分离通道 ,在KNO3 缓冲溶液中 ,用表面镀汞膜的金微电极作为工作电极 ,采用单脉冲伏安法同时测定铜、锌、铅、镉含量 ,考察并优化了影响分离和检测的相关因素 :缓冲溶液pH、分离高压、脉冲上限和下限、脉冲宽度等。该法的最佳实验条件 :5mmol/LKNO3(pH6.0) ,分离高压20kV ,脉冲上限 -0.2V ,脉冲下限 -1.15V(vs.SCE) ,脉冲宽度500ms。结果表明 ,各峰面积与其离子浓度成线性关系 ,线性范围(μg/mL)分别为 :铜5.0×10-2～10.0;锌1.0×10-2～10.0 ;铅5.0×10-2～5.0 ;镉2.0×10-2～10.0。加标回收率在95%～110%之间。用该法较好地测定了水样中的重金属铜锌铅镉     

Coprecipitative Preconcentration and Differential Pulse Cathodic Stripping Voltammetric Determination of Selenium (IV)

Abstract

A DPCSV procedure for the determination of selenium (IV) with a prior preconcentrative coprecipitation on iron (III) hydroxide has been developed. The experimental conditions for coprecipitation of selenium (IV) onto iron (III) hydroxide, viz. pH, iron (III) concentration, volume of aqueous phase and selenium concentration, were optimized. The coprecipitated selenium (IV) is dissolved in 10 ml of 0.1 M HCl and analysed using DPCSV in the presence of copper (II). Selenium concentrations as low as 10–100 ng present in 500 ml of the aqueous phase could be determined. The method is precise and has been applied to the analysis of sea water and reference material samples.     

Standardless Electrochemical Method for Mercury,Cadmium, Lead and Copper Determination in Aqueous Solution

A standardless electrochemical method for metal ion determination in aqueous solution is proposed. This method is based on the combination of stripping voltammetry and controlled potential coulometry laws. Its application requires neither calibration using standard solutions nor standard additions to the studying solutions. The efficiency of the new method was examined using the detection of mercury, cadmium, copper and lead ions in aqueous media. The interference of metal ions was studied, and the determination of each metal ion was carried out in the presence of the others. The method was tested on samples of river water analyzed independently by atomic absorption spectrometry. A good agreement of the results was demonstrated.     

测定微量血清铜、锌的新方法

报道了单用重蒸馏氏倍稀释微量血清后,直接采用ＰＥ４００型原子吸收仪,ＨＧＡ７００型石墨炉,测定血清中铜,锌浓度的新方法。本法用血量少,只用重蒸馏水稀释,标本不易受污染,测定结果稳定,与标准的火焰原子吸收法测定结果有很好的相关性。本法可提高微量法测定铜,锌浓度的准确性,有助于末梢血微量元素测定方法在临床的推广,尤其适用于儿科病儿及需反复测定多种元素的病人。     

肝癌与肝硬化腹水微量元素Cu、Zn测定的临床诊断价值

腹水是一种病理性腹腔渗出液或漏出波．肝癌、肝硬化晚期，腹膜炎等多种疾病可致病人出现腹水，由于引起腹水病因不同，腹水中各物质含量亦有所不同．关于腹水中微量元素含量的研究尚少见报道。为此作者分三组测定了４８份腹水中的Ｃｕ、Ｚｎ含量，进行了分析比较，结果如下：１．Ｃｕ含量．其它组高于肝癌组，肝癌组高于肝硬化组，各组间差异非常显著，Ｐ＜０．０１。２．Ｚｎ含量，肝癌组高于肝硬化组，肝硬化组高于其它组，各组间差异显著，Ｐ＜０．０５．３．以上结果说明，测定腹水中Ｃｕ、Ｚｎ含量是一项了解腹水性质较敏感指标，尤其是肝硬化癌变时，Ｃｕ、Ｚｎ含量有明显的变化．     

Simultaneous Spectrophotometric Determination of Cadmium, Zinc and Copper with Kalman Filter

The compound 2-QADNm can form red complexes with caamium(II), zinc(II) and copper(II). The simultaneous determination of cadmium, zinc and copper with Kalman Filter is described in this paper, the proposed method was applied to a two-component system for determining cadmium and copper,and a three-component system for determining cadmium, zinc and copper.     

用溶出伏安法测定蛋白胨细胞生长液中易变形态铜

采用阳极阶梯溶出伏安法 ,测定了蛋白胨细胞生长液中的易变形态铜 ,并获得了总铜量中易变形态的摩尔分数以及易变形态的表观稳定常数。通过使用交换介质法 ,较好消除了由于蛋白胨细胞生长液中各种氨基酸或其它组分吸附在汞膜表面而引起的干扰     

同时测定癌症病人血液中锌镉铅铜的微分脉冲阳极溶出伏安法

用微分脉冲阳极溶出伏安法同时测定癌症病人血液中的锌、镉、铅和铜，以为癌症与这4种微量元素在血液中含量的相关性研究提供实验数据；癌症病人血液用硝酸-高氯酸消化，消化后的白色固体加水溶解，以0．100mol/L硫酸铵为底液，在三电极体系中进行测定，以峰电位定性，峰电流定量；用该法测定了3种癌症病人血液中的锌、镉、铅和铜，相对标准偏差为2．9％—3．3％(n＝6)，加标回收率为98％—110％；该法不用除氧、干扰少、分辨率好、准确度高，适用于临床血液中锌、镉、铅和铜的测定和研究。     

方波伏安法同时测定食物中的铜、铅、锌、镉、铁、钴、镍、锰

经过预处理的食物样品:在马福炉中灰化24h,加HNO_3、HClO_4蒸干。残渣用HC1O_4-酒石酸底液提取。首先用方波阳极溶出伏安法测定其中Cu、Pb、Zn、Cd。然后加入氨水使pH约为9.5,用方波阴极伏安法测定Fe、Mn。最后加入丁二酮肟溶液,用方波吸附伏安法测定Ni、Co。     

浊点萃取-火焰原子吸收光谱法测定菠菜中镁、锌和铜

在pH 8.0缓冲溶液中,以8-羟基喹啉为螯合剂,镁、锌和铜均与8-羟基喹啉生成螯合物,加入Triton X-100表面活性剂用浊点萃取分离富集菠菜样品中镁、锌和铜。分取部分表面活性剂相用乙醇定容至25mL,所得溶液直接用火焰原子吸收光谱法进行测定。对影响浊点萃取的因素和共存离子的干扰等进行了试验并予以优化。镁、锌和铜的检出限(3s/k)依次为0.057,0.064,0.032mg.L-1。应用此法测定了大叶菠菜和小叶菠菜中3种元素的含量,在两种样品中用标准加入法进行方法的回收试验,测得镁的回收率在93.3%～100.5%之间;锌的回收率在91.7%～97.9%之间;铜的回收率在94.0%～107.1%之间。     

Simultaneous Determination of Iron and Copper in Ethanol Fuel Using Nafion/Carbon Nanotubes Electrode

This work presents the analytical method development for iron and copper determination in ethanol fuel. This method was developed using stripping voltammetry with a glassy carbon electrode modified with Nafion/Carbon‐nanotubes. With linear sweep stripping voltammetry was achieved a limit of detection of 7.1×10^?7 mol L^?1 for Fe³⁺ and 5.1×10^?8 mol L^?1 for Cu²⁺. The amperometric sensitivities were 2.0×10⁶ µA mol^?1 L for Fe³⁺ and 2.8×10⁷ µA mol^?1 L for Cu²⁺. The recovery study showed that the method has good accuracy and repeatability, with recovery of 108 and 103 % for Fe³⁺ and Cu²⁺ respectively.     

原子吸收法测定妇科恶性肿瘤组织中的铜和锌

探讨了用原于吸收法测定妇科恶性肿瘤组织中Cu、Zn的条件，并对样品处理和基体元素的干扰进行了研究，结果表明，本法具有灵敏度高、分析速度快和准确度高等优点。适用于妇科恶性肿瘤病因研究工作中肿瘤组织中Cu、Zn等元素的测定。     

电感耦合等离子体原子发射光谱法测定杨树叶中铜锌铅镍

研究了电感耦合等离子体原子发射光谱法(ICP-AES)的仪器工作参数,溶液提升速率为2.4 mL.min-1,雾室压力为2.07×105Pa,观测高度为16 mm。用浓硝酸1 mL作样品的消化剂。用此方法测定杨树叶标准物质(GBW 07604)中铜、锌、铅、镍,相对误差在0.54%~9.3%之间,加标回收率在97.9%~101.0%之间。     

Voltammetric Determination of Chloride Ion in Automotive Fuel Ethanol

Cathodic stripping voltammetry with a hanging mercury drop electrode was used in this study to determine chloride ions in automotive fuel ethanol. Choosing the correct stripping voltammetric technique, the correct choice of deposition potential and time provided well defined voltammetric waves with good repeatability and relatively small errors, with a determination limit of 0.13 mg L^?1, for only 10 s of deposition time, with better sensitivity and repeatability than the normalized method, as well as consumed less volume of the sample, being suitable for routine analysis.