共查询到19条相似文献,搜索用时 46 毫秒
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流动注射在线萃取—火争原子吸收法测定食用盐中的锌 总被引:2,自引:0,他引:2
基于锌与1-(2-吡啶偶氮)-2-萘酚(简称PAN)形成的配合物可被氯仿萃取,从高盐基体样品中分离富集锌,利用自行设计的分相器,实验确定了最佳的流动注射在线萃取-火焰原子吸收光度法测定锌的流呼系统和化学反应条件。在选定的工作条件下,其RSD和检出限分别为4.3%(c=0.6μg/mL,n=11)和0.03μg/mL,测定速度为25样/h。用于实际样品的测定,加标回收率为97%-106%。 相似文献
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流动注射—原子吸收法测定苦杏仁甙 总被引:6,自引:0,他引:6
1 引言 苦杏仁甙的测定按照药典规定采用银量法,此法使用仪器简单,但灵敏度低,不适于低含量或少量样品。近几年某些仪器分析方法已用于这项测定,包括色谱法、核磁共振波谱法及酶电极法等。火焰原子吸收仪器普遍、选择性好,与流动注射技术相结合,操作简单、分析速度快,用于此项研究有明显优点,为此作者对FIA—AAS测定苦杏仁甙的方法进行了研究。 相似文献
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流动注射在线萃取色谱预浓集火焰原子吸收法测定钯 总被引:6,自引:0,他引:6
以三异辛胺萃淋树脂为微型柱固定相,采用流动注射在线预浓集与火焰原子吸收法联用技术,对微量钯的测定进行了研究。在0.5mol/L的HCl介质中以7.8mL/min的速率采样90s再用0.1mol/L硫脲-0.5mol/L HCl洗脱;在27h^-1的采样频率下,浓集系数为50倍,浓集效率为22.5min,消耗指数0.23mL。线性范围为0-1000μg/L,检出限为0.34μg/L。钯含量水平50μg/L时,连续11次测定的相对标准偏差为2.6%,并对加氢催化剂中的钯进行了加标回收率实验,回收率为99.3%-101.2%。 相似文献
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流动注射分析(FIA)技术的主要优点是分析速度快,每小时可获得上百次分析结果。在例行分析时,高浓度样品需预先稀释,这样既降低了分析速度,又带来稀释误差,当样品有毒时显得尤为不便。因此,迫切需要有对高浓度样品在线稀释的方法以克服上述缺点,并适应在线监测及过程控制的需要。目前已有许多FIA在线稀释技术的研究工作,本文就这方面的研究进展做一介绍并进行综合评述。 相似文献
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流动注射在线萃取—石墨炉原子吸收光谱法测定地质样品痕量钯 总被引:6,自引:6,他引:6
应用流动注射在线萃取技术将PdCl^2-6萃入2-巯基苯并噻唑-甲基异丁基酮直接进行石墨炉原子吸收测定。研究了流动注射在线萃取-石墨炉原子吸收光谱法测定地质样品中钯的实验条件、流路参数等。采样速率为20样/h,RSD(n=10)为4.8%,测定Pd的特征质量为2.6*10^-11。 相似文献
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A flow injection flame atomic absorption spectrometry system incorporating a microcolumn of rice bran was designed, and its capability for on‐line trace enrichment of copper, cadmium and lead was studied. Analytes were deposited on the microcolumn by processing a standard or solution of analytes on the column. Injection of 250 μL of nitric acid (1 mol/L) then served to elute the retained species to FAAS. The procedure was successfully applied for determination of copper in tap water, well water and multivitamin tablets. The accuracy was assessed through recovery experiments and independent analysis by furnace‐AAS. A sample volume of 20 mL of copper resulted in a preconcentration factor of 96; precision value at the 20 μg/L was 4.1%. 相似文献
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Using on-line solid phase extraction for flow-injection spectrophotometric determination of salbutamol 总被引:1,自引:0,他引:1
《Analytica chimica acta》2002,455(1):103-109
In the proposed procedure, the determination of salbutamol with Folin-Ciocalteau reagent (FC) using a flow injection analysis technique (FIA) with spectrophotometric detection at 750 nm is described. The lab-made FIA system consisted of a peristaltic pump Gilson Minipulse 3 equipped with Tygon tubes, double 6-port external Vici Valco sample injector and S 2000/SAD500 fiber optic spectrophotometer. It was controlled by a PC with use of originally compiled LabVIEW®—supported software containing the mathematical library with various statistical functions for off-line data evaluation. Concentration, volume of reagents and flow rate were optimised by a simplex method. The proposed system was used for the direct determination of salbutamol sulphate in the tablets and the human urine without preliminary pre-treatment of the sample. The negative effect of interfering substances (excipients of the tablets and matrix of the urine) is overcome by a solid phase extraction (SPE), when salbutamol is adsorbed on the solid phase in the microcolumn, which is integrated directly into the flow system. Pre-treatment of the sample takes place directly in the flowing stream. The sample throughput without carryover of on-line SPE was 60-80 samples per hour. With the SPE column (Baker—carboxylic acid), salbutamol was determined in the linear range from 1 to 15 μg ml−1 (R.S.D.=1.2%), with detection limit (3σ) 0.1 μg ml−1 and a frequency of 40-60 samples per hour in the water solutions. The salbutamol was determined in the linear range from 2 to 20 μg ml−1 (R.S.D.=1.7%), with detection limit (3σ) 1 μg ml−1 and a frequency of 30 samples per hour in the samples of the human urine. 相似文献
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流动注射(FI)在线沉淀ICP-AES法测定碘 总被引:2,自引:0,他引:2
利用在酸性介质中碘离子与硝酸银反应生成沉淀,加入乙醇降低沉淀的溶解度,加入氨水,CO2-3 、SO2-3 、C2O2-4 等离子不干扰测定,建立了流动注射在线沉淀ICP-AES法测定碘的新方法。方法的线性范围为5~50 μg/m L,进样速率40 次/h,加标回收率为98.7% ~100.1% ,分析结果满意。 相似文献