Study of adsorption characteristics of long chain alkyl amine and petroleum sulfonate on silicates by electrokinetic potential, microflotation, FTIR, and AFM analyses

The long-chain alkyl amines and petroleum sulfonates are mostly used to remove unwanted minerals from feldspar ores in acidic pHs. In this study, their adsorption characteristics on pure albite and quartz were investigated by electrokinetic potential measurements, microflotation tests, Fourier transform infrared spectroscopy, and atomic force microscopy studies. According to the results, amine had strong influence on zeta potentials of both albite and quartz turning them positive and resulting over 90% flotation recovery at certain pH values. Petroleum sulfonate, on the other hand, was less effective in terms of both zeta potential values and flotation recovery responses of albite. Although albite and quartz had different zeta potentials and flotation recovery responses with each collector, they displayed similar adsorption bands of CH2 group over fingerprint region and adsorption layers with different intensities after being treated with the collectors. However, the adsorption of each collector on the minerals was altered by rinsing with acetone indicating that the interaction of the collectors with albite and quartz surfaces were mostly by Coulombic forces and hydrogen bonding

Arsenic accumulation on the bones in the Early Bronze Age Ikiztepe Population, Turkey

In this study, arsenic, copper and lead content of a group of human and animal bones recovered from the Early Bronze Age Ikiztepe site have been analyzed using ICP-MS method Average arsenic value of 90 femur bones of a human was found to be 15.0 +/- 5.79 ppm which was varied among age and sex groups, and among species Origin of arsenic accumulation in bones was diagenetic because overall the groups were highly variable The distribution of metallic items among the burials had a big affect on the arsenic uptake of the bones Copper and lead values supported the diagenetic arsenic accumulation in the bones as well Their values on the bones were not as high as those for the individuals Involved in metal working activities in the ancient world. Judging from these data, It is concluded that Ikiztepe people did not produce the manufactured metallic items using arsenical copper but might have been imported from the other sites (C) 2009 Elsevier Ltd All rights reserved