Sorption of sulfate on iron oxide minerals: Hematite and goethite

Content Provider	Semantic Scholar
Author	Turner, Laurie J.
Copyright Year	1989
Abstract	The influence of sulfate on terrestrial and aquatic ecosystems depends on the mobility of the sulfate anion in soils. This mobility is determined by several factors, one being the types and amounts of soi 1 constituents. In this study, several iron oxide/hydroxide minerals were evaluated for sulfate sorption characteristics. Hematite and goethite were synthesized and positively identified using x-ray diffraction, mossbauer spectroscopy and scanning electron microscopy. Mineral surfaces were characterized using surface area and zero point of charge measurements, infrared spectroscopy and thermal analyses. Neutron activation and x-ray fluorescence were used to look for impurities. Samples were compared to a natura1 hematite sample and a synthetic jarosite. Sorption experiments, conducted on mineral suspensions in KNO3 media at room temperature, considered the variables time, ionic strength, sol id:so lut ion ratio, pH and sulfate concentrât ion. Sorption was initiated by a fast reaction, fol lowed by a longer, slower one which reached an apparent equilibrium in 24 hours. Sorption was unaffected by sol id:solution ratio and decreased with ionic strength at pH 5 for goeth i te on 1 y.
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Alternate Webpage(s)	https://macsphere.mcmaster.ca/bitstream/11375/25266/1/Turner_Laurie_J_1988Dec_PhD.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article