2014/02/10 16:59
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YSI防玷污的10个技巧
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》
环保
2014/03/04
NanoBrook产品应用-12-ZetaPALS
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
2015/04/16
植物油中9种抗氧化剂的测定GB5009.32-2016
抗氧化剂是指能防止或延缓食品氧化,提高食品的稳定性和延长贮存期的食品添加剂。GB5009.32-2016《食品安全国家标准 食品中9种抗氧化剂的测定》中采用GPC和C18小柱对食品中9种抗氧化剂进行前处理,该方法回收率低,测试结果不稳定。安谱实验优化了实验方法,用CNW Poly-Sery PSD SPE小柱进行前处理,克服了国标方法的缺点,方法简单,9种抗氧化剂的回收率均在90%以上。
食品/农产品
2019/07/31
磷酸样品中TOC的测定-紫外湿法氧化
磷酸中杂质的监测对于其应用至关重要。除其它参数外,总有机碳还作为总量参数应用于质量控制中,用于评估有机杂质的整体污染情况。 本文主要对紫外-过硫酸盐氧化法和NDIR检测器对磷酸中TOC杂质的全自动质量控制进行验证。
石油/化工
2022/07/12