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建立高效液相色谱法测定糕点中的柠檬黄、日落黄的方法。样品经水浸泡提取,于涡旋混匀器中快速混匀,浸泡放置过夜,取离心后的上清液,以甲醇和乙酸铵溶液梯度淋洗,用紫外检测器检测,柠檬黄、日落黄分别采用430 nm和482 nm检测波长。线性相关系数为0.999,柠檬黄、日落黄的检出限分别为0.4,0.3 mg/kg。样品加标回收率为72.5%~82.0%,柠檬黄、日落黄测定结果的相对标准偏差分别为4.8%和3.7%(n=5)。方法简便快捷,节省试剂,减少了杂质干扰,提高了灵敏度。 相似文献
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液相色谱法测定果蔬汁中柠檬黄和日落黄方法优化 总被引:2,自引:0,他引:2
对液相色谱法测定果蔬汁中柠檬黄和日落黄进行了方法优化,对色谱条件进行了调整,采用ODS-C18型(250 mm×4.6 mm)色谱柱,流动相甲醇-0.02 mol/L乙酸铵(体积比40∶60,pH4),流速为0.6 mL/min。采用紫外检测器,柠檬黄检测波长为430 nm,日落黄检测波长为510 nm。该方法测定结果的相对标准偏差为柠檬黄1.3%(n=4)、日落黄2.3%(n=4)。柠檬黄和日落黄的平均回收率分别为84.17%、88.33%。该法满足实验要求。 相似文献
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维脑路通的伏安行为及其二阶导数卷积伏安法测定 总被引:2,自引:0,他引:2
以多种电化学手段研究了维脑路通的伏安行为。在磷酸盐缓冲溶液中( p H 4) ,维脑路通产生一个不可逆吸附还原波 ,峰电位 - 1 .55V ( vs.SCE)。建立了二阶导数卷积伏安法测定的新方法 ,并将此法应用于维脑路通注射液及模拟尿样中维脑路通的测定。 相似文献
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络合吸附伏安法同时测定多种重金属离子 总被引:1,自引:0,他引:1
在络合剂亚硝基苯胲 乙醇 乙酸铵体系中,Cr(Ⅵ)、Cd2 、Cu2 、Pb2 、Ni2 等离子都能在汞电极上产生灵敏的阴极络合吸附波,其二次导数伏安峰电流均与离子质量浓度有良好的线性关系,可用于这些离子的定量检测,测定线性范围为Cr(Ⅵ)0.0017~0.67μg mL、Cd2 0.0017~0.117μg mL、Cu2 0.0083~5 8μg mL、Pb2 0.083~1.25μg mL、Ni2 0.17~150μg mL,RSD分别为5.7%、1 3%、1.4%、2 5%和1.6%。方法为工业废水、地表水及生活用水等样品中重金属离子的同时测定提供了可靠、灵敏的检测方法。 相似文献
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食用色素的吸附伏安法分析 总被引:2,自引:0,他引:2
柠檬黄,胭脂红皆为合成食用色素,其原料本胺具有毒性,我国严格限定其使用范围和用量。测定混合色素多用色谱法,导数光度法。都需将试样先行分离,灵敏度较低。Fogg等用脉冲极谱法测定饮料中的混合色素。我们发现,混合色素柠檬黄和胭 相似文献
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维脑路能的伏安行为及其二阶导数卷积伏安法测定 总被引:1,自引:0,他引:1
以多种电化学手段研究了维脑路通的伏安行为。在磷酸盐缓冲溶液中(pH4),维脑路通产生一个不可逆吸附还原波,峰电位-1.55V(vs.SCE)。建立了二阶导数卷积伏安法测定的新方法,并将此法应用于维脑路通注射液及模拟尿样中维脑路通的测定。 相似文献
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Bismuth Film Electrodes for Adsorptive Stripping Voltammetric Determination of Sunset Yellow FCF in Soft Drinks 下载免费PDF全文
Agnieszka Królicka Andrzej Bobrowski Jerzy Zarębski Iwona Tesarowicz 《Electroanalysis》2014,26(4):756-765
The bismuth film electrode was used to record well‐developed voltammograms of azo food coloring Sunset Yellow FCF (SY). The employed Bi(III)/HClO4 plating solutions produced very adhesive and mechanically stable films that were applied in both stationary and flow conditions. The influence of the dimensions of the glassy carbon support, plating solution concentration and potential was discussed. The sensitivity of SWV was sufficient to obtain a linear calibration curve for low concentration levels of SY (below 0.1 mg/L; LOD=1 µg/L, linear range 4.4–87 µg/L). The measurements in a flow system were considered as a tool for the determination of relatively high concentrations (>1 mg/L; LOD=300 µg/L, linear range 300–8800 µg/L) of SY. 相似文献
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In this paper, ultrathin graphene (GN) nanosheets were uniformly decorated with nickel (Ni) nanoparticles, as confirmed by scanning electron microscopy and transmission electron microscopy. This GN? Ni hybrid exhibited excellent accumulation and catalytic capacity for the simultaneous detection of sunset yellow and tartrazine, two colorants commonly found mixed in foodstuffs. The electrochemical reaction mechanism of sunset yellow and tartrazine were studied in detail on the GN? Ni nanocomposite modified glassy carbon electrode. In square wave voltammetry measurements, the oxidation peak potentials of sunset yellow and tartrazine were separated by about 250 mV. This novel proposed voltammetric method has good selectivity which was successfully applied for the simultaneous determination of sunset yellow and tartrazine in some food sample extracts. 相似文献
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A platform based on praseodymium doped dysprosium oxide-carbon nanofibers modified electrode was constructed for the simultaneous determination of SY and TAR. SEM, EDX and XRD techniques were utilized for characterizing the proposed material. The voltammetric behaviour and properties of SY and TAR were gradually improved at materials in order from CNFs to Dy2O3−CNFs and Pr6O11@Dy2O3−CNFs. The working range was found to be 1.0×10−9–3.5×10−8 M and 1.5×10−9–4.0×10−8 M for SY and TAR, respectively. The value of LOD was 3.12×10−10 M and 5.35×10−10 M for SY and TAR, respectively. The platform (Pr6O11@Dy2O3−CNFs/GCE) was successfully applied to the electroanalysis of samples. 相似文献
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利用吸附溶出伏安法、极谱催化法测定痕量锗已有报道。但将吸附溶出伏安法与极谱催化法结合进行测定,尚未见报道。我们选择适当的体系和配位体3,4-二羟基苯甲醛(DHB)及氧化剂钒(V),首先使Ge(Ⅳ)-DHB络合物在悬汞电极上于一定电位处吸附富集一定时间,然后电位向负的方向扫描。当达到Ge(Ⅳ)-DHB络合物的还原电位时,Ge(Ⅳ)还原 相似文献
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A sensitive and fast method for the simultaneous determination of trace amounts of nickel and cadmium in real samples has been described using differential pulse adsorptive stripping voltammetry (DPASV) by adsorptive accumulation of the N,N′‐bis(salicylaldehydo)4‐carboxyphenylenediamine (BSCPDA)–complex on the hanging mercury drop electrode (HMDE). As supporting electrolyte 0.02 mol L?1 ammonia buffers containing ligand has been used. Optimal analytical conditions were found to be: BSCPDA concentration of 42 μM, pH 9.6 and adsorption potential at ?50 mV versus Ag/AgCl. With an accumulation time of 20 s, the peaks current are proportional to the concentration of nickel and cadmium over the 1–180, and 0.5–200 ng mL?1 with detection limits of 0.06 and 0.03 ng mL?1 respectively. The sensitivity of method for determination of nickel and cadmium were obtained 0.54 and 0.98 nA mL ng?1, respectively. The procedure was applied to simultaneous determination of nickel and cadmium in some real and synthetic artificial samples with satisfactory results. 相似文献
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舒乐安定吸附伏安法的研究 总被引:2,自引:0,他引:2
Jimenez曾研究了舒乐安定的性质,但灵敏度较低,本文提出了测定痕量舒乐安定的吸附伏安法,在0.1 mol/L NH_3-NH_4Cl溶液(pH 9.3)中,富集电位—0.80 V(us. Ag/AgCl)得一灵敏的舒乐安定还原峰,Ep=—1.05 V,i_p与舒乐安定浓度在3.0×10~(-9)~5.0×10~(-6) mol/L范围内呈线性关系,检测限达1.0×10~(-9)mol/L,并用于试样的测定,用循环伏安法和恒电 相似文献