as a sampling trier, four samples were taken from each waste
molding sand pile. The samples were transferred into 500-mL
I-CHEM glass jars with Teflon-lined polypropylene closures
(Chase Scientific Glass Inc., Rockwood, TN, USA) and immediately shipped to our laboratory in Styrofoam coolers with ice packs. Upon receipt, the samples were stored at 4
C until
processed.