氨氮检测中ph值和钾离子的补偿

文献名： Structural, morphological and optical properties of Bi NPs obtained by laser ablation and their selective detection of L-cysteine 作者： Ramon Gabriel Teixeira Rosaa, Celso de Araujo Duartea , Wido Herwig Schreinera, Ney Pereira Mattoso Filhoa, Arandi Ginane Bezerra Jr.b, Andersson Barisonc, Fernanda Maria Marins Ocamposc a Departamento de Física, Universidade Federal do Paraná Centro Politécnico, CP 19044, 81531-990 Curitiba (PR), Brazil b Departamento Acadêmico de Física, Universidade Tecnológica Federal do Paraná, 80230-901 Curitiba (PR), Brazil c Departamento de Química, Universidade Federal do Paraná Centro Politécnico, CP 19081, 81531-990 Curitiba (PR), Brazil 摘要：In the present work we show the results of the investigation of the properties of bismuth nanoparticles (NPs) obtained by the laser ablation in water. The samples were characterized by various techniques: UV/vis spectroscopy, dynamic light scattering, transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, nuclear magnetic resonance and zeta potential. The NPs were metallic and surface oxidated, exhibiting absorption peak at 257 nm due to the surface plasmon resonance. The interaction between the NPs and various amino acids was studied and revealed a selective sensibility to cysteine on a range of concentration from 80 to 720 μM, which we attribute to a dimerization of cysteine to cystine probably complexed to the nanoparticle surface by electrostatic interactions, leading to the modification of the NP absorption spectrum. 关键词：Bismuth; Nanoparticles; Laser ablation; Cysteine

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其中《SY/T 醇胺脱硫溶液中热稳定盐阴离子组成分析 离子色谱法》规定了热稳定盐种类及测试范围，明确离子色谱法为标准检测方法。

润滑油的降解主要是随着自由基的氧化过程进行的。因此，自由基的形成速度和水平提供了一个有益指标，该指标表明了特定的机油在实际驾驶条件下的性能。所以，现在，我们的工作是在典型的驾驶条件下、在机油的使用寿命期间，研究如何使用电子自旋共振波谱仪（ESR，又称EPR）测量自由基的形成。 ESR技术是唯一能够直接测量材料中自由基形成的方法。本文建议确定机油的自由基ESR信号与其驾驶时间是否存在关联。由于自由基是机油中氧化降解的初始产物，因此，能够监测其浓度，将有助于确定特定的机油类型或配方在当前的性能状况。