Several pure and mixed oxides (ZnO, CuO, were investigated as regenerate sorbents for the removal of H2S at high temperatures. A special technique was used to prepare the sorbents in highly porous form. The sorbents were subjected to successive sulfidation-regeneration cycles in a packed-bed microreactor. Sulfidation was carried out at 538-650 °C with H2S-H20-H2-N2 mixtures, regeneration with 02-N2-H20 mixtures. Fresh, sulfided, and regenerated sorbents were characterized by XRD, SEM-EDS, and BET surface area analysis. Solid conversion and the prebreakthrough exit concentration of H2S are discussed in terms of physical structure and thermodynamic properties of the sorbents. The performance of the sorbents Cu0-Fe203, Cu0-Al203, and Cu0-Fe203-Al203 is discussed in terms of changes in the oxidation state of copper during sulfidation.
In arsenic (As) endemic areas of southeast Asia, where a subsistence rice-based diet is prevalent, As exposure from food is mainly focused on rice intake. However, consumption of wheat is substantial and increasing. We present a probabilistic assessment of increased cancer risk from wheat-based food intake in a study population of rural Bihar, India where As exposure is endemic. Total As in wheat grains (43.64±48.19 µg/kg, n=72) collected from 77 households across 19 villages was found to be lower than reported As in wheat grains from other southeast Asian countries but higher than a previous study from Bihar. This is the first study where
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