共查询到19条相似文献,搜索用时 78 毫秒
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一类新偶氮胂酸型试剂与铍的荧光性能研究 总被引:7,自引:0,他引:7
本实验鉴定了四个新荧光试剂,并对其与铍的荧光性能进行了研究。结果表明,4-,AsA-8Q5S是铍的优良试剂,它与铍在pH7.0的硼砂体系中形成1+1的稳定络合物,其λes/em为474/544nm,检测下限为2.6×10^-^9,该体系用于直接测定水中的铍,结果满意。 相似文献
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新试剂5-氟偶氮胂Ⅰ荧光法测定铝的研究 总被引:2,自引:0,他引:2
本文报道了新试剂5-氟偶氮胂Ⅰ(5-FAsA-Ⅰ)的合成方法,研究了荧光光度法测定铝的反应条件。Al(Ⅲ)与试剂在pH5.60HAc-NaAc缓冲介质中形成1+1红色配合物并呈现荧光,λex/λem=348.6/391.4nm,线性范围为0~0.2μg/mL,检测限为3.0ng/mL。用于分析茶叶样品中的铝,结果满意。 相似文献
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SAAQ-CTMAB荧光光度法测定微量铝的研究 总被引:3,自引:0,他引:3
某些席夫碱具有一定的刚性平面及富电子的共轭体系 ,从而使其显示出良好的荧光特性 ,导致该类试剂在荧光分析中显出越来越重要的作用[1 ] 。虽然荧光法测定铝已有文献[2~4] 报道 ,但本文所提出的SAAQ在CTMAB存在下与铝产生荧光增敏测定微量铝的方法尚未见报道。研究表明在pH =4.0~ 5.5的乙酸铵缓冲溶液及CTMAB存在下 ,铝与SAAQ形成 1∶2的络合物。该络合物在λeχ/λem=378nm/490nm处荧光最强 ,线性范围为 0~ 2 0 0 μg·dm- 3,方法用于人发及茶叶中铝含量的测定 ,结果满意。1 试验部分1 .1 仪器与试剂… 相似文献
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铝合金建材的X射线荧光分析 总被引:1,自引:1,他引:1
陈天文 《分析测试技术与仪器》2007,13(2):88-92
用高性能飞利浦PW2424型X射线荧光光谱仪,测定铝合金建材中的Si、Fe、Cu、Mn、Mg、Zn、Ti、Cr、Ni等9个化学元素的含量.给出各元素的干扰校正系数和基体效应校正系数.方法准确、灵敏,稳定性好,速度快. 相似文献
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四磺基铝酞菁与爱尔新蓝的缔合作用在核酸定量中的应用 总被引:1,自引:0,他引:1
阴离子荧光染料四磺基铝酞菁与阳离子荧光染料爱尔新蓝的缔合作用 ,使四磺基铝酞菁发生荧光猝灭 ,而当核酸存在时 ,染料缔合平衡受到影响而导致四磺基铝酞菁的荧光恢复。根据这一原理 ,建立了核酸定量测定的新方法。方法具有很高的灵敏度和较好的选择性 ,其线性范围为 0~ 2 0 0 μg/L ;检测限分别为 1.8μg/L(SMDNA)、2 .0 μg/L(CTDNA)、5 .4μg/L(酵母RNA)。将方法用于实际样品金黄色葡萄球菌中DNA含量的测定 ,获得满意结果 相似文献
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《Analytical letters》2012,45(13):1447-1462
Abstract The reaction between Cu(I) and four non pyridinic derivatives of rhodanine (5-(phenyl)methylene-rhodanine (BARH), 5-(0-hydroxy-phenyl) methylenerhodanine (SARH), 5-(p-methoxy-phenyl) methylene-rhodanine (AARH) and 5-indolyl-(3)-methylene-rhodanine (IARH)) have been considered. the influence of the different experimental parameters on the formation of the complexes was studied, and the optimum conditions for the determination of copper were established. The indol-(3)-al derivative was selected among these because of the greater sensitivity of the metal reaction. The precision of the procedure, expressed in terms of relative standard deviation was 1.1 %. The methods have been applied to the determination of copper in several constrasted samples. Finally, these derivatives of rhodanine were compared with others classical reagents used in the photometric determination of copper. 相似文献
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《Analytical letters》2012,45(18):2868-2877
ABSTRACTDopamine has been shown interact strongly with Cu2+ to form a stable complex and inhibit the formation of polythymine-templated copper nanoclusters. Based on these findings, a label-free sensing strategy has been designed for the detection of dopamine using polythymine-templated copper nanoclusters as fluorescence probes. The fluorescent method exhibits sensitive and selective detection of dopamine with a linear range from 1?nM to 50?µM and a detection limit of 0.5?nM. In addition, the method was successfully applied for the determination of dopamine in dopamine hydrochloride injection samples. Thus, this approach holds considerable potential for the construction of a simple, rapid, and sensitive fluorescent assay for the determination of dopamine. 相似文献
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An electroanalytical strategy for the simultaneous determination of ascorbic acid (AA) and dehydroascorbic acid (DHA), is described. A palladized Al electrode is used for hydrodynamic amperometry of AA. While the decrease of anodic stripping voltammetry current of the K2UO2[Fe(CN)6]‐Pd/Al electrode prepared in the presence of DHA was the principal of the DHA determination. The calibration graph for both methods was linear over the concentration range 1–50 μM. The detection limit was found to be 0.5 μM. Some fresh fruit juices and vegetables of trace level of AA and DHA were analyzed as the typical example of application. 相似文献
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Dobromir D. Enchev 《Phosphorus, sulfur, and silicon and the related elements》2013,188(1):243-248
Abstract The chemistry of phosphorus derivatives of salicylic acid has been revived and the synthesis of alkadienephosphonate derivatives of salicylic acid is reported. 相似文献