The water leach test was conducted at room temperature
according to ASTM International method D 3897
(ASTM International, 2004), except that a 2 g sample of waste mold-
ing sand was mixed with 40 mL of deionized (DI) water as
described above. The aqueous extracts were centrifuged for
10 min. at 3000g and then filtered through a 0.45 mm
membrane filter.