AbstractThis work describes a nanohybrid material consisting of gold nanoparticles (AuNPs) and nanosheets of layered double hydroxides (NLDHs) of Mg(II) and Al(III). Mono-disperse AuNPs were immobilized on the surface of the LDHs via Au-O bonding. The nanohybrid sorbent was packed in an organic filter along with a syringe and applied to the microextraction of triazine herbicides with the help of an injection pump. The collected hexane eluate was concentrated and directly injected into a HPLC column for quantification. The effects of the amount of Au/LDH nanohydrobrids, type, flow rate, volume of washing and eluting solvent were optimized. The method was validated by detecting four triazine herbicides (prometryn, atrazine, terbumeton and secbumeton) in spiked maize. The limits of detection range between 35 and 108 pg g−1. The relative standard deviations range from 1.0–6.9% for repeatability and 4.6–7.8% for reproducibility (for n = 5). Graphical abstractSchematic presentation of a nanohybrid material consisting of gold nanoparticles and nanosheets of layered double hydroxides of Mg(II) and Al(III) (Au/LDH) for use as an adsorbent for microextraction in a packed syringe. Organic filter heads were used as the container of Au/LDHs nanohybrids, and were connected with the syringes installed on the injection pump for the semi-automatic microextraction and preconcentration of triazines in maize.

中文翻译：

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金纳米颗粒和层状双氢氧化物纳米片的填充混合物用于从玉米中微萃取三嗪类除草剂

摘要这项工作描述了一种由金纳米粒子 (AuNPs) 和 Mg(II) 和 Al(III) 的层状双氢氧化物 (NLDHs) 纳米片组成的纳米杂化材料。单分散的AuNPs通过Au-O键固定在LDHs的表面。纳米杂化吸附剂与注射器一起装入有机过滤器中，并在注射泵的帮助下用于三嗪类除草剂的微萃取。将收集到的己烷洗脱液浓缩后直接注入HPLC柱进行定量。优化了Au/LDH纳米氢化物的用量、类型、流速、洗涤体积和洗脱溶剂的影响。该方法通过检测加标玉米中的四种三嗪类除草剂（prometryn、莠去津、terbumeton 和 secbumeton）进行验证。检测范围在 35 到 108 pg g-1 之间。重复性的相对标准偏差范围为 1.0–6.9%，再现性的相对标准偏差范围为 4.6–7.8%（对于 n = 5）。图形摘要 由金纳米颗粒和层状双氢氧化物 Mg(II) 和 Al(III) (Au/LDH) 组成的纳米混合材料的示意图，用作填充注射器中微萃取的吸附剂。有机滤头用作 Au/LDHs 纳米杂化物的容器，并与安装在注射泵上的注射器连接，用于玉米中三嗪的半自动微提取和预浓缩。图形摘要 由金纳米颗粒和层状 Mg(II) 和 Al(III) (Au/LDH) 双氢氧化物纳米片组成的纳米混合材料的示意图，用作填充注射器中微萃取的吸附剂。有机滤头用作 Au/LDHs 纳米杂化物的容器，并与安装在注射泵上的注射器连接，用于玉米中三嗪的半自动微提取和预浓缩。图形摘要 由金纳米颗粒和层状 Mg(II) 和 Al(III) (Au/LDH) 双氢氧化物纳米片组成的纳米混合材料的示意图，用作填充注射器中微萃取的吸附剂。有机滤头用作 Au/LDHs 纳米杂化物的容器，并与安装在注射泵上的注射器连接，用于玉米中三嗪的半自动微提取和预浓缩。