Pasquet Camille, Gunkel-Grillon Peggy, Laporte-Magoni Christine, Serres Arnaud, Quiniou Thomas, Rocca François, Monna Fabrice, Losno Remi, van Oort Folkert, Chateau Carmela
PPME, Université de la Nouvelle-Calédonie, BP R4, 98851, Nouméa Cedex, Nouvelle-Calédonie, France.
UMR 6298, ArTeHis, Université de Bourgogne - Franche Comté - CNRS-Culture, 6 bd Gabriel, Bat. Gabriel, 21000, Dijon, France.
Environ Sci Pollut Res Int. 2016 Dec;23(24):25105-25113. doi: 10.1007/s11356-016-7617-x. Epub 2016 Sep 27.
A simple new device for dry separation of fine particulate matter from bulk soil samples is presented here. It consists of a stainless steel tube along which a nitrogen flow is imposed, resulting in the displacement of particles. Taking into account particle transport, fluid mechanics, and soil sample composition, a tube 6-m long, with a 0.04-m diameter, was found best adapted for PM separation. The device rapidly produced several milligrams of particulate matter, on which chemical extractions with EDTA were subsequently performed to study the kinetic parameters of extractable metals. New Caledonian mining soils were chosen here, as a case-study. Although the easily extracted metal pool represents only 0.5-6.4 % of the total metal content for the elements studied (Ni, Co, Mn), the total concentrations are extremely high. This pool is therefore far from negligible, and can be troublesome in the environment. This dry technique for fine particle separation from bulk parent soil eliminates the metal-leaching risks inherent in wet filtration and should therefore ensure safe assessment of environmental quality in fine-textured, metal-contaminated soils.
本文介绍了一种用于从大量土壤样本中干式分离细颗粒物的新型简易装置。它由一根不锈钢管组成，管内施加氮气流，从而使颗粒发生位移。综合考虑颗粒传输、流体力学和土壤样本组成，发现一根6米长、直径0.04米的管子最适合用于颗粒物分离。该装置能快速产生几毫克的颗粒物，随后对其进行乙二胺四乙酸（EDTA）化学萃取，以研究可萃取金属的动力学参数。这里选取了新喀里多尼亚的矿土作为案例研究。尽管对于所研究的元素（镍、钴、锰）而言，易萃取金属库仅占总金属含量的0.5 - 6.4%，但其总浓度极高。因此，这个金属库绝不可忽视，并且在环境中可能会造成麻烦。这种从大量原生土壤中分离细颗粒的干式技术消除了湿式过滤中固有的金属浸出风险，因此应能确保对质地细腻、受金属污染的土壤进行安全的环境质量评估。
