Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1002/aoc.251
Titel (primär) Behaviour of organoarsenic compounds in contact with natural zeolites
Autor Elizalde-González, M.P.; Mattusch, J.; Wennrich, R.
Quelle Applied Organometallic Chemistry
Erscheinungsjahr 2002
Department ANA
Band/Volume 16
Heft 1
Seite von 9
Seite bis 16
Sprache englisch
Keywords arsenite; arsenate; organoarsenicals, methylarsonic acid; dimethylarsinic acid; arsenobetaine; phenylarsonic acid; natural zeolites; speciation; HPLC–ICP-MS
Abstract Batch experiments were conducted on aqueous solutions containing arsenite, arsenobetaine, methylarsonic acid or phenylarsonic acid in contact with natural zeolites to examine their interaction. The concentration of the arsenic species in the liquid phase at equilibrium before and after contact was measured by means of liquid chromatography coupled with inductively coupled plasma mass spectrometry detection. Clinoptilolites completely removed arsenobetaine from the solution and the resulting amounts of dimethylarsinic acid were detected. The methylarsonic acid maximum concentration diminution was reached at a mass—to volume V value of m/V = 0.2. Phenylarsonic acid solution decreased its concentration 75% after treatment with clinoptilolites. Untreated mordenites in contact with arsenite solutions led to the formation of arsenate, whereas acid-washed mordenites practically removed arsenobetaine and were less effective for methylarsonic acid. To show the incompatibility of molecular dimensions with the zeolite windows, the molecular parameters of surface area, molecular volume, molecular length, and the width and depth of arsenite, arsenate and a series of ten organic arsenic compounds were calculated. Since sorption onto the external zeolite surface rather than a sieve process defined the interaction, an acid-catalysed reaction mechanism is proposed to explain the transformation results.
dauerhafte UFZ-Verlinkung
Elizalde-González, M.P., Mattusch, J., Wennrich, R. (2002):
Behaviour of organoarsenic compounds in contact with natural zeolites
Appl. Organomet. Chem. 16 (1), 9 - 16 10.1002/aoc.251