药品中有机溶剂残留气相色谱仪测定方法

YSI 防玷污的10点技巧 随着电子技术的进步、电源管理的改进和电池寿命的延长，生物玷污成为目前决定监测仪器投放周期长度的决定因素，特别是应用于长期、连续监测。应用一些防玷污技术可以延长仪器的维护间隔，能够减少野外的仪器维护的次数，并提高水质监测数据精度。 防玷污技巧的详细内容请参考文章《YSI 防玷污的10点技巧》

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

1、恒温槽采用铝块加热的方式，50~200℃范围内进行高精度温度调节。 2、反应柱分为内径3·5·10mmX长度50·100mm的六个种类，材质分为不锈钢材质和玻璃材质，玻璃反应柱适用于酸性样品的反应。 3、反应柱在恒温槽内的固定操作十分简单，只需一个拉杆动作即可完成安装。 4、样品导入端分为液相反应用和气液反应用2个种类（选购） 5、氢气、氧气、二氧化碳气的气体反应用大流量控制单元也可配备（选购）

矿物油组成中的共轭体系物质在紫外光区有较强的吸收，依据朗博 - 比尔定律，在256nm紫外光波长，可测定油样的吸光度来确定相应油的量。 由于紫外光度法对于油种的敏感性较强，本方法的油样需采用标准物质。