title: Effect of grain size and heavy metals on As immobilization by marble particles.
abstract: The effect of grain size and the interaction of heavy metals on As sorption by marble waste with different particle sizes was investigated. Acidic solutions containing only arsenic and a mixture of arsenic, lead, zinc, and cadmium were put in contact with the marble waste. The amount of metal(loid)s that were immobilized was calculated using the difference between the concentration in the acidic solution and in the liquid phase of the suspensions. Approximately 420 μg As m(-2) was sorbed onto the marble grains, both nonspecifically and specifically, where ≥ 80 % of the total arsenic in the acidic solution remained soluble, which suggests that this amendment is not effective to immobilize arsenic. However, in mixed contamination, relatively stable Pb-Ca arsenates were formed on the surface of the marble particles, and the soluble arsenic was reduced by 95 %, which indicates that marble particles can effectively immobilize arsenic and lead when both appear together.
authors.affiliation: Agronomy Department, Soil Science Area, Almería University, Agrifood Campus of International Excellence ceiA3. Sacramento Road s/n, 04120, Almería, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Simón
authors.forename: I
authors.initials: I
authors.lastname: García
authors.forename: V
authors.initials: V
authors.lastname: González
authors.forename: A
authors.initials: A
authors.lastname: Romero
authors.forename: F
authors.initials: F
authors.lastname: Martín
mesh_terms: D000327:Adsorption; D001151:Arsenic / Q000737:chemistry*; D002119:Calcium Carbonate / Q000737:chemistry*; D004787:Environmental Pollution / Q000517:prevention & control*; D052918:Environmental Restoration and Remediation / Q000379:methods*; D019216:Metals, Heavy / Q000737:chemistry*; D010316:Particle Size; D052638:Particulate Matter / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis*; D012996:Solutions; D014874:Water Pollutants, Chemical / Q000032:analysis; D014877:Water Pollution, Chemical / Q000517:prevention & control
chemical_list: D019216:Metals, Heavy; D052638:Particulate Matter; D012989:Soil Pollutants; D012996:Solutions; D014874:Water Pollutants, Chemical; D002119:Calcium Carbonate; D001151:Arsenic