Effects of conditioning and treatment of chabazite and clinoptilolite prior to lead and cadmium removal
Article Abstract:
The exchange capacity of the natural zeolites chabazite and clinoptilolite when used for lead and cadmium removal can be significantly improved if they are exposed to concentrated NaCl solutions, which places them in a homoionic state in the Na form. Both of these zeolites have high potassium and sodium levels in their as-received forms, and the exchangeable ions they contain are affected by exposure to concentrated sodium chloride and sodium hydroxide solutions. At lead and cadium concentrations of more than 250 mg/L, conditioning and treating the zeolites led to better removal performance and exchange capacity.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1993
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Competition of Al3+ in complexation of humic matter with Pb2+: a comparative study with other ions
Article Abstract:
Humic substances enhance binding of metal complexes to organic matter in natural waters. Potentiometric and voltammetric experiments show that there is competition in complexation of organic matter in the presence of the metals aluminum (Al3+) and lead (Pb2+). The competition between Al3+ and Pb2+ for the complexing groups of humic matter is influenced by the electrostatic nature of aluminum, which affects the charges of the complexing sites of the molecule. Complexation is also influenced by aluminum and humic matter concentrations.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1996
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Lead release from smelter and mine waste impacted materials under simulated gastric conditions and relation to speciation
Article Abstract:
Lead solid-phase speciation and release kinetics of separates less than 250 micrometers were investigated to determine potential bioaccessibility of lead from mining and smelting impacted solids. A set of 66 soil and 19 waste samples gathered from a town in Colorado were analyzed. Data indicated the presence of at least two lead pools reacting at different rates during two simultaneous first-order reactions. Mine waste impacted solids were found to readily emit lead under simulated gastric conditions.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1996
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