In this work, a congo red modified single wall carbon nanotubes (CR-SWCNTs) coated fused-silica capillary was prepared and used for capillary microextraction (CME) of trace amounts of lanthanum (La), europium (Eu), dysprosium (Dy) and yttrium (Y) in human hair followed by fluorinating assisted electrothermal vaporization-inductively coupled plasma-optical emission spectrometry (FETV-ICP-OES) determination. The adsorption properties and stability of the prepared CR-SWCNTs coated capillary along with the various factors affecting the separation/preconcentration of La, Eu, Dy and Y by CME were investigated in detail. Under the optimized conditions, with a consumption of 2 mL sample solution, a theoretical enrichment factor of 50 and a detection limit (3σ) of 0.12 ng mL(-1) for La, 0.03 ng mL(-1) for Eu, 0.11 ng mL(-1) for Dy and 0.03 ng mL(-1) for Y were obtained, respectively. The preparation reproducibility of the CR-SWCNTs coated capillary was investigated and the relative standard deviations (RSDs) were ranging from 4.1% (Eu) to 4.4% (La) (CLa, Dy=1.4 ng mL(-1); CY, Eu=0.25 ng mL(-1), n=7) in one batch, and from 5.7% (Eu) to 6.1% (Y) (CLa, Dy=1.4 ng mL(-1); CY, Eu=0.25 ng mL(-1), n=5) among different batches. The proposed method was applied to the analysis of real-world human hair sample and the recoveries for the spiked sample were in the range of 93-105%. The method was also applied to the determination of La, Eu, Dy and Y in Certified Reference Material of GBW07601 human hair, and the determined values were in good agreement with the certified values.

中文翻译：

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毛细管微萃取结合氟化辅助电热汽化电感耦合等离子体发射光谱法测定人发中的痕量镧，euro 、,和钇。

在这项工作中，制备了刚果红改性的单壁碳纳米管（CR-SWCNTs）涂覆的熔融石英毛细管，并将其用于痕量镧（La），euro（Eu），（Dy）的毛细管微萃取（CME）。人发中的钇（Y），然后进行氟化辅助电热汽化-电感耦合等离子体发射光谱法（FETV-ICP-OES）的测定。详细研究了制备的CR-SWCNTs毛细管的吸附性能和稳定性，以及影响CME对La，Eu，Dy和Y分离/预富集的各种因素。在优化条件下，消耗2 mL样品溶液，理论富集系数为50，La的检出限（3σ）为0.12 ng mL（-1），Eu为0.03 ng mL（-1），0.11 ng Dy（0）的mL（-1）。获得的Y分别为03 ng mL（-1）。研究了CR-SWCNTs涂层毛细管的制备重现性，相对标准偏差（RSD）为4.1％（Eu）至4.4％（La）（CLa，Dy = 1.4 ng mL（-1）; CY，Eu一批= 0.25 ng mL（-1），n = 7），从5.7％（Eu）到6.1％（Y）（CLa，Dy = 1.4 ng mL（-1）; CY，Eu = 0.25 ng mL （-1），n = 5）。将该方法用于实际人发样品的分析，加标样品的回收率在93-105％之间。该方法还用于测定GBW07601人发认证参比物质中的La，Eu，Dy和Y，测定值与认证值吻合良好。研究了CR-SWCNTs涂层毛细管的制备重现性，相对标准偏差（RSD）为4.1％（Eu）至4.4％（La）（CLa，Dy = 1.4 ng mL（-1）; CY，Eu一批= 0.25 ng mL（-1），n = 7），从5.7％（Eu）到6.1％（Y）（CLa，Dy = 1.4 ng mL（-1）; CY，Eu = 0.25 ng mL （-1），n = 5）。将该方法用于实际人发样品的分析，加标样品的回收率在93-105％之间。该方法还用于测定GBW07601人发认证参比材料中的La，Eu，Dy和Y，测定值与认证值相符。研究了CR-SWCNTs涂层毛细管的制备重现性，相对标准偏差（RSD）为4.1％（Eu）至4.4％（La）（CLa，Dy = 1.4 ng mL（-1）; CY，Eu一批= 0.25 ng mL（-1），n = 7），从5.7％（Eu）到6.1％（Y）（CLa，Dy = 1.4 ng mL（-1）; CY，Eu = 0.25 ng mL （-1），n = 5）。将该方法用于实际人发样品的分析，加标样品的回收率在93-105％之间。该方法还用于测定GBW07601人发认证参比物质中的La，Eu，Dy和Y，测定值与认证值相符。不同批次之间的7％（Eu）至6.1％（Y）（CLa，Dy = 1.4 ng mL（-1）; CY，Eu = 0.25 ng mL（-1），n = 5）。将该方法用于实际人发样品的分析，加标样品的回收率在93-105％之间。该方法还用于测定GBW07601人发认证参比物质中的La，Eu，Dy和Y，测定值与认证值相符。不同批次之间的7％（Eu）至6.1％（Y）（CLa，Dy = 1.4 ng mL（-1）; CY，Eu = 0.25 ng mL（-1），n = 5）。将该方法用于实际人发样品的分析，加标样品的回收率在93-105％之间。该方法还用于测定GBW07601人发认证参比材料中的La，Eu，Dy和Y，测定值与认证值相符。