Application of natural zeolites for preconcentration of arsenic species inwater samples

Citation
Mp. Elizalde-gonzalez et al., Application of natural zeolites for preconcentration of arsenic species inwater samples, J ENVIR MON, 3(1), 2001, pp. 22-26
Citations number
16
Categorie Soggetti
Environment/Ecology
Journal title
JOURNAL OF ENVIRONMENTAL MONITORING
ISSN journal
14640325 → ACNP
Volume
3
Issue
1
Year of publication
2001
Pages
22 - 26
Database
ISI
SICI code
1464-0325(200102)3:1<22:AONZFP>2.0.ZU;2-I
Abstract
Zeolites of the clinoptilolite type produced in Mexico and Hungary were inv estigated with respect to their sorption efficiency for various redox speci es of arsenic. Long-term experiments showed that arsenate remains stable fo r a long period in spiked deionised water and drinking water, as well as in the surface water of the Biela valley in Saxony, Germany. Both clinoptilol ites are able to decrease the initial arsenic concentration of 200 mug l(-1 ) by more than 75% in deionised, drinking, ground and sur face waters. In t he case of the Mexican zeolite, both the arsenite and the arsenate concentr ations (200 mug l(-1))can be lowered from 200 mug l(-1) to 10 mug l(-1) whi ch is the World Health Organisation's (WHO's) recommended maximum level. It was found that the presence of cations and anions in the natural waters of Biela, Germany, and Zimapan, Mexico, did not reduce the efficiency of the selected zeolites. The Hungarian zeolite removed 75% of the arsenate in the Zimapan water and only 50% when the sample was first acidified. This zeoli te totally desorbed the fixed arsenic into a water volume that was half the volume in the adsorption experiment.