一种用于测定痕量铬的新型液晶共振瑞利散射光谱探针。
A novel liquid crystal resonance Rayleigh scattering spectral probe for determination of trace Cr.
机构信息
School of Public Health, Guilin Medical University, Guilin 541199, China; Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology for Science and Education Combined with Science and Technology Innovation Base, Guilin 541006, China.
School of Public Health, Guilin Medical University, Guilin 541199, China; Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology for Science and Education Combined with Science and Technology Innovation Base, Guilin 541006, China.
出版信息
Spectrochim Acta A Mol Biomol Spectrosc. 2022 Oct 5;278:121306. doi: 10.1016/j.saa.2022.121306. Epub 2022 Apr 28.
Hexavalent chromium (Cr) has strong oxidizing property and toxicity. It has been identified as a carcinogen with obvious carcinogenic effect by the International Anti-cancer Research Center. Therefore, it has a great significance to establish a simple and sensitive method for Cr. In the solution, liquid crystal (LC) trans, trans-4-(3,4-difluorophenyl)-4'-n-pentylbicyclohexyl (DP) exhibits strong resonance Rayleigh scattering (RRS) effect due to formation DP nanoparticles. It was used firstly as nanoprobe, to establish a simple and sensitive RRS energy transfer (RRS-ET) method for the determination of trace Cr in water samples. The Cr reacts with diphenylcarbazide (DCB) to produce purple complex. It is adsorbed on the nanoprobe surface, the purple complex as energy receptor and DP as energy donor to produce RRS-ET phenomenon, to make the RRS signal of 370 nm decreasing. In the range of 3-30 nmol/L Cr, with the increase of concentration, the RRS signal decreased linearly at 370 nm, with a detection limit of 0.49 nmol/L. This new RRS-ET method was applied to the determination of Cr in water samples, with recovery of 96.0-104.7% and the relative standard deviation (RSD) of 4.44-9.98%.
六价铬（Cr）具有很强的氧化性和毒性。国际癌症研究中心已将其确认为一种具有明显致癌作用的致癌物质。因此，建立一种简单、灵敏的 Cr 检测方法具有重要意义。在溶液中，液晶（LC）trans，trans-4-（3,4-二氟苯基）-4'-n-戊基双环[2.2.2]辛烷（DP）由于形成 DP 纳米颗粒而表现出强烈的共振瑞利散射（RRS）效应。它首先被用作纳米探针，建立了一种简单、灵敏的 RRS 能量转移（RRS-ET）方法，用于测定水样中的痕量 Cr。Cr 与二苯卡巴肼（DCB）反应生成紫色络合物。它被吸附在纳米探针表面上，作为能量受体的紫色络合物和作为能量供体的 DP 产生 RRS-ET 现象，使 370nm 的 RRS 信号减弱。在 3-30nmol/L Cr 范围内，随着浓度的增加，370nm 处的 RRS 信号线性降低，检测限为 0.49nmol/L。该新的 RRS-ET 方法用于水样中 Cr 的测定，回收率为 96.0-104.7%，相对标准偏差（RSD）为 4.44-9.98%。
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