Antimony distribution and mobility in different types of waste derived from the exploitation of stibnite ore deposits.

Wastes derived from the exploitation of stibnite ore deposits were studied to determine their mineralogical, chemical, and environmental characteristics and establish the Sb distribution and the current and long-term risks of Sb mobilization. Representative samples of mine waste rocks, mine tailings, and smelting waste were studied by X-ray powder diffraction, polarized light microscopy, electron microprobe analysis, and digestion, leaching, and extraction procedures. The main Sb-bearing minerals and phases identified in the smelting waste were natrojarosite, iron (oxyhydr)oxides, mixtures of iron and antimony (oxyhydr)oxides, and tripuhyite; those in the mine tailings and mine waste rocks were iron (oxyhydr)oxides and/or mixtures of iron and antimony (oxyhydr)oxides. Iron (oxyhydr)oxides and natrojarosite had high Sb contents, with maximum values of 16.51 and 9.63 wt% Sb2O5, respectively. All three types of waste were characterized as toxic; the mine waste rocks and mine tailings would require pretreatment to decrease their leachable Sb content before they would be acceptable at hazardous waste landfills. Relatively little of the Sb was in desorbable forms, which accounted for <0.01 and <0.8% of the total Sb content in the smelting waste and mine waste rocks/mine tailings, respectively. Under reducing conditions, further Sb mobilization from mine waste rocks and mine tailings could occur (up to 4.6 and 3.3% of the total content, respectively), considerably increasing the risk that Sb will be introduced into the surroundings. Although the smelting waste had the highest total Sb content, it showed the lowest risk of Sb release under different environmental conditions. The significant Fe levels in the smelting waste facilitated the formation of various Fe compounds that greatly decreased the Sb mobilization from these wastes.

Behaviour and survival of high-grade neuroendocrine carcinomas of the lung.

INTRODUCTION: Large-cell neuroendocrine carcinoma is an aggressive variant of large-cell carcinoma of the lung, which has poor survival in most series, resembling that of small-cell lung carcinoma. We report our retrospective assessment of surgically-resected cases of both tumours. METHODS: 33 large-cell neuroendocrine carcinomas and 16 peripheral small-cell lung carcinomas were reassessed retrospectively. Survival rates of both tumours in surgically-resected cases were calculated and compared using Kaplan-Meier survival curves and Log Rank test, respectively. RESULTS: In large-cell neuroendocrine carcinomas, there were 25 patients with pathologic stage I, 4 with pathologic stage II and 4 with pathologic stage III. In small-cell lung carcinomas, there were 6 patients with pathologic stage I, 3 with pathologic stage II and 7 with pathologic stage III. 12% of large-cell neuroendocrine carcinomas and 62.5% of small-cell lung carcinomas were of advanced disease. The mean follow-up was 89 months. The actuarial survival for the 2 groups was not significantly different. CONCLUSION: Large-cell neuroendocrine carcinomas of the lung have poor prognosis even in early stages, with survival rates similar to that of small-cell lung carcinomas.