超声萃取-高效液相色谱法测定土壤中8种烷基酚和烷基酚聚氧乙烯醚

建立了一种测定土壤中8种烷基酚(APs)和烷基酚聚氧乙烯醚(APEOs)的分析方法。样品用二氯甲烷-乙酸乙酯(4∶1,V/V)混合溶剂进行3次超声提取,经硅胶固相萃取柱净化,采用高效液相色谱(HPLC)和Waters PAH C_(18)色谱柱(250 mm×4.6 mm,5.0μm),以乙腈-水(85∶15,V/V)溶液等度洗脱,在16 min内完成分离,通过荧光检测器(λ_(ex)/λ_(em)=228/300 nm)检测。结果表明,8种组分在10.0~500μg/L范围内有良好的线性关系(R0.999),检出限为1.2~3.0μg/kg,测定下限为4.8~12.0μg/kg。在高、低浓度基体加标测试中,8种组分的回收率分别为69.9%~81.8%和70.3%~84.8%,相对标准偏差(RSD)分别为2.2%~6.8%和5.1%~12.1%。本方法灵敏度高、重现性好,操作简单且便于推广,可用于土壤中烷基酚及烷基酚聚氧乙烯醚的同时测定。     

Mode division multiplexed holography by out-of-plane scattering of plasmon/guided modes

We design and demonstrate a type of multiplexed hologram by nanoscatterers inside a dielectric-loaded plasmonic waveguide with guided-wave illuminations. The mode division multiplexed hologram(MDMH) is fulfilled by the scattering of guided waves to free space with respect to different modes. According to different mode numbers, these guided modes have different responses to the multiplexed hologram, and then give rise to different holographic images in reconstructions. In experiments, we show two kinds of MDMHs based on TM_0∕TE_0 and TE_0∕TE_1 modes as examples. Our approach could enrich the holography method that favors on-chip integration.