微分脉冲阴极吸附溶出伏安法测定利多卡因

用微分脉冲阴极吸附溶出伏安法测定了利多卡因针剂的含量。浓度与波高的线性范围为1×10~(-7)～3×10~(-4)mol/dm~3。最低检测限l×10~(-8)mol/dm~3。回收率98.07±0.05%。     

2.5次微分溶出出伏安法测定水中镍

应用平衡法测定了４种浓度＾１４Ｃ－苄嘧磺隆溶液在１０种土壤的吸附与解吸性能。结果表明；土壤对苄嘧磺隆有很强的吸附性，且随供试土壤理化性质的差异其吸附性呈现明显变化，安徽红壤和江西红壤性水稻土吸附率为７３．２４％和５０．９５％；江苏黄潮土Ｂ和Ａ吸附率分别为１０．７４％和２１．１２％。     

微分脉冲阳极溶出伏安法测定碘离子

基于I-能被氧化生成IO₃^-的特性,以铂球电极为工作电极,研究了微分脉冲阳极溶出伏安法(DPAS)测定碘离子.由于产物IO₃^-在电极上有吸附,因而在+1.3V电清洗120s.在pH=4的0.1mol/LKH₂PO₄-K₂HPO₄缓冲溶液底液中,能检测出5.00×10^-7mol/L的I-,在5.00×10^-71.50×10^-5mol/L范围内I^-的浓度与峰电流有良好的线性关系.该方法用于海带、食用碘盐中碘的测定,取得了较好的结果.     

椭圆法用于阳极溶出伏安法测定微量银

用新物理量Ｖｏｐ的椭圆法对阳极溶出伏安法分析的含银离子浓度为１０＾５－１０＾－９ｍｏｌ／Ｌ的一系列溶液进行了研究。结果表明：光学方法与电化学方法所得分析结果相同；椭圆法可检测的浓度下限比电化学方法低一个数量级以上。而且测量的相对平均偏差也小于电化学方法。     

2.5次微分溶出伏安法测定茶叶中痕量锌

本报告了测定痕量锌的一种新方法，在０．０１ｍｏｌ／ＬＨＡｃ－０．０１ｍｏｌ／ＬＮａＡｃ溶液中，锌和乙醛酸缩氨基硫脲形成的配合物产生一个很灵敏的还原峰，峰电位是一－０．８２Ｖ（ｖｓ．ＳＣＥ），锌的浓度在２．０×１０＾－８－８．０×１０＾－７ｍｏｌ／Ｌ范围内与峰高呈直线关系，检测限是６．０×１０＾－９ｍｏｌ／Ｌ，该方法用于测定茶叶中痕量锌，结果令人满意。     

微分脉冲阴极溶出伏安法测定阿米卡星

硫酸阿米卡星(Am ikacin sulfate)是一种氨基糖苷酸类抗生素,化学名为O-3氨基-3-脱氧-а-D-蒲吡喃糖基-(1-6)-O-[6-氨基-6-脱氧-а-D-蒲吡喃糖基-(1-4)]-N-(4-氨基-2-羟基-1-氧丁基)-2-脱氧?D-链霉胺硫酸盐。目前报道的测定方法主要有高效液相法[1]、镍毛细管电泳法[2]。本文研究了阿米卡星在玻碳电极上的电化学行为。微分脉冲溶出伏安法是一种灵敏度很高的痕量分析方法,本文利用该方法对阿米卡星进行了测定,发现阿米卡星在pH=2的盐酸底液中,产生一灵敏的还原峰,可用于定量测定。平行测定了7次,RSD为2·05%,该方法可用于注射液及血清中…     

阳极溶出催化伏安法的理论研究 Ⅱ.不可逆电极溶出

本文对在玻璃碳电极上不可逆溶出催化的理论进行了研究,推导了溶出催化过程的电流方程,峰电流和峰电势方程,并用微计算机模拟出各种关系曲线,从理论方程得知溶出催化伏安法所得的峰电流比溶出伏安法的峰电流提高了二个数量级。本文还用钯的溶出催化实验验证理论方程,所得的实验结果均与理论方程相吻合。     

丁二酮肟修饰碳糊电极阳极溶出伏安法测定痕量铋

报道了用丁二酮肟修饰碳糊电极测定微量铋的电分析方法。Bi~(3+)通过与电极表面的丁二酮肟作用而富集在电极表面,同时在-0.40 V(vs.SCE)还原成零价,当电极电势从-0.40 V向0.40 V扫描时,被还原的铋从电极表面溶出,在0.03 V出现一个十分灵敏的阳极溶出峰。优化了各种实验参数,如支持电解质的选择及pH值、丁二酮肟的用量、富集电位及时间等。修饰电极测定铋的线性范围为1×10~(-9)～1×10~(-6)mol/L。富集6 min后检出限可达4×10~(-10)mol/L。该方法简便快速,灵敏度高,分析成本低廉,并成功应用于实际水样中微量铋的测定。     

Carbon Paste Electrode Modified by Surfactant for Anodic Stripping Voltammetric Determination of Sulphadiazine

ＣａｒｂｏｎＰａｓｔｅＥｌｅｃｔｒｏｄｅＭｏｄｉｆｉｅｄｂｙＳｕｒｆａｃｔａｎｔｆｏｒＡｎｏｄｉｃＳｔｒｉｐｐｉｎｇＶｏｌｔａｍｍｅｔｒｉｃＤｅｔｅｒｍｉｎａｔｉｏｎｏｆＳｕｌｐｈａｄｉａｚｉｎｅＺｈａｎｇＺｈｅｎｇ－ｑｉ；ＣｈｅｎＺｈａｎ－ｇｕａｎ...     

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。     

Double Deposition and Stripping Steps for Trace Determination of Au(III) Using Anodic Stripping Voltammetry

A new way of decreasing the detection limit ‐ double deposition and stripping steps was proposed to determine trace amounts of gold(III) by anodic stripping voltammetry. Two carbon composite electrodes that differed drastically in their surface areas were used for the measurements. The calibration graph was linear from 1×10^?9 to 1×10^?8 mol L^?1 following deposition time of 300 s at the first and the second electrode. The detection limit was found to be 2.3×10^?10 and 1.4×10^?11 mol L^?1 for deposition time 600 and 2400 s, respectively. It is the lowest detection limit obtained so far for gold(III) determination in stripping voltammetry.     

微分脉冲溶出伏安法测定除草通

提出了苹果、土豆、西红柿中除草通残留量的电分析化学测定方法,研究了除草通在汞电极上的电化学行为,探讨了其电极反应机理。结果表明,除草通在汞电极上具有吸附性质,其电极反应为不可逆的还原过程。本方法的测量线性范围为0．01～0．16mg/L,检出限为9．1μg/L.     

Determination of Cadmium by Differential Pulse Adsorptive Stripping Voltammetry in the Present of Captopril

A new method is presented for determination of cadmium based on cathodic adsorptive stripping of the complex of cadmium with captopril,1‐[(2S)‐3‐mercapto‐2‐methylpropionyl]‐L ‐praline (CPL) at a hanging mercury drop electrode(HMDE). The most suitable operating conditions and parameters, such as pH, deposition potential, deposition time, ligand concentration, and others were selected and the determination of cadmium from aqueous solutions using the standard additions method was possible. Under the optimum conditions and for an accumulation time of 60 s, the measured peak current is proportional to the concentration of cadmium over the range of 1–300 nM. The limit of detection at S/N ratio of 3 was 0.3 nM and a relative standard deviation of 2.5% at 0.1 μM was achieved. The interference of other cations and anions was studied. The method was designed in order to determination of Cd in four analytical grade salts, with satisfactory results.     

Stripping Voltammetric Determination of Methyl Parathion at Activated Carbon Nanopowder Modified Electrode

An activated carbon nanopowder modified glassy carbon electrode (AC-GCE) was constructed for the sensitive determination of methyl parathion by adsorptive differential pulse anodic stripping voltammetry. The simple and rapid modification procedure included only drop-coating the electrode surface with a laponite stabilized activated carbon nanopowder suspension and drying. The modifier high adsorption ability, combined with its large electroactive surface area allowed a 30-fold signal increase to be achieved, compared to bare GCE. Under optimized experimental conditions (activated carbon to laponite ratio, pH and accumulation time), the AC-GCE exhibited a linear response to methyl parathion in two concentration ranges: from 0.01 μmol L⁻¹ to 1 μmol L⁻¹ and from 1 μmol L⁻¹ to 6 μmol L⁻¹. The LOD of 2.5 nmol L⁻¹ (S/N=3) achieved fitted with regulatory norms. It was demonstrated that the as-prepared AC-GCE is suitable for routine real samples analysis.     

Simultaneous Determination of Antimony and Lead in Gunshot Residue by Cathodic Adsorptive Stripping Voltammetric Methods

Differential pulse cathodic adsorptive stripping (DPCAdSV) and square wave cathodic adsorptive stripping (SWCAdSV) voltammetric methods were developed for the determination of antimony and lead in gunshot residues. Linear working ranges for DPCAdSV and SWCAdSV methods were (2.0×10^?9–5.0×10^?7) M and (2.0×10^?9–7.0×10^?7) M for antimony and 2.0×10^?9–3.0×10^?7 M (both methods) for lead. The detection of antimony limits were found to be 1.3×10^?9 M for DPCAdSV and 7.3×10^?10 M for SWCAdSV while the corresponding values for lead were 3.0×10^?9 M and 5.8×10^?10 M. Antimony and lead contents obtained by these methods in gunshot residues are in good agreement with those obtained by graphite furnace atomic absorption spectrometric method within a confidence limit of 95%.