Pressurized liquid extraction and GC/MS determination of model contaminants in HDPE - Application to recycling of post-consumer polyolefins using limonene.

A pressurized liquid extraction and gas chromatography-mass spectrometry (PLE-GC/MS) method is developed for the quantification of seven model contaminants in post-consumer and recycled high-density polyethylene (HDPE). Chloroform, toluene, chlorobenzene, methyl salicylate, phenyl cyclohexane, benzophenone, and methyl stearate were selected as model contaminants according to the European Food Safety Authority (EFSA) and the Food and Drug Administration (FDA) recommendations. The GC/MS method presented limits of detection (LOD) under 0.

The preparation of highly active antimicrobial silver nanoparticles by an organometallic approach.

Silver nanoparticles of small size with a high surface to volume ratio have been prepared using an organometallic approach. For this, the complex NBu(4)[Ag(C(6)F(5))(2)] has been treated with AgClO(4) in a 1:1 molar ratio, giving rise to the nanoparticle precursor [Ag(C(6)F(5))] in solution. Addition of one equivalent of hexadecylamine (HDA) and 5 h of reflux in toluene leads to a deep yellow solution containing monodisperse silver nanoparticles (Ag NPs) of ca.