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The determination of rare earth elements (REEs) in airborne particulate matter (APM) was conducted, and the distribution pattern of atmospheric REEs was evaluated in this study. The APM was collected ...
We have developed an accurate and traceable quantitation method of proteins and peptides by isotope-dilution mass spectrometry with the precolumn derivatization for hydrolyzed amino acid. This method ...
A fast, accurate, precise and sensitive capillary electrophoresis method for the simultaneous determination of dextromethorphan hydrobromide, phenylephrine hydrochloride, paracetamol and chlorpheniram...
Solid-phase spectrophotometry has been improved for the determination of the total and dissolved phosphate in water. The target phosphate-P at sub-μg dm−3 to μg dm−3 levels in a 20-cm3 wat...
This study examined the potential utility of DNA sequence analysis to discriminate and identify plant material in forensic investigations. DNA was extracted from plant leaf fragments of 11 species sto...
Despite environmental and geochemical interests, Cr and Fe have been left beyond the reach of determinations by ICP-MS due to severe interferences originating from Ar. The applicability of a dynamic r...
The ultra high performance liquid chromatography (UHPLC)-UV method for the simultaneous determination of furosemide, saluamine (furosemide metabolite), spironolactone, carnenone (spironolactone active...
A sulfated poly β-cyclodextrin (SPCD) modified silica-based monolithic column was prepared for enantiomeric separation. First, 2-hydroxy-3-allyloxy-propyl-β-cyclodextrin (allyl-β-CD) was bonded onto a...
A simple and sensitive method is proposed for the electrochemical determination of enrofloxacin (ENRO) and its primary metabolite ciprofloxacin (CIPRO) at a multiwall carbon nanotubes/glassy carbon el...
A polystyrene coated quartz crystal nanobalance (QCN) sensor was developed for use in the determination of a number of linear short-chain aliphatic aldehyde and ketone vapors contained in air. The qua...
A method for the determination of several tricyclic antidepressants (imipramine, desipramine, amitriptyline, nortriptyline, clomipramine, norclomipramine, doxepine and nordoxepine) in breast milk has ...
偶氮胂Ⅱ用作检定铍的试剂     检定铍  偶氮胂Ⅱ       2008/12/11
偶氮胂Ⅱ与铍在弱酸性溶液中形成紫色络合物,此反应在PH~5.5时可用於铍的检定,其灵敏度较常用的桑色素法及锟茜素法为高。检出限为0.013微克胂,稀度限1:4,000,000。在检出铍的条件下,有多种离子干扰,如应用适当的隐蔽剂即可避免其影响。隐蔽前后的界限比均分别求出。应用该试剂可检出铜合金中的少量铍,而不需预先分离。
Lys(z)-NCA was synthesized in the presence of triphosgene,amphiphilic triblock copolymers poly(Nε-CBZ-Lysine)-PEG-poly(Nε-CBZ-Lysine) were synthesized in DMF using amino-end ended PEG as initiator wit...
摘要 以FT-IR方法研究了水/C12-EOx-C12•2Br/正己醇/正庚烷形成的W/O微乳中水的状态. 结果表明, 其中的水存在4种状态, 分别为阳离子头基结合水、反离子结合水、类似本体的水以及束缚在微乳栅栏层中的水. 由解卷积技术分解FT-IR谱图, 进而获得每个表面活性剂分子对应于这4种状态水分子的数目nN+, nBr-, nb和nf. 随着水含量(W0)增加, nb急剧增大,...
摘要 本文对不同条件下形成的汞D$的形成过程丶汞膜形态与其形成条件的关系以及对溶出峰的影响.结果表明: 玻碳表面的汞膜是由视直径小于10μm, 的微汞滴构成, 其分布密度随镀汞电位的负值增加而增加;微汞滴在电析过程中不断长大并相聚成更大一些的微汞滴, 在旋转玻碳电极上, 汞膜的最大平均厚度大会超过5μm, 而适用于溶溶出分析的范围为0.05~1μm, 比文献记载的范围(0.001~10-5M时虽经...

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