7 research outputs found

    Phosphate removal by adsorption

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    Phosphate removal efficiencies of 13 natural pumice rock samples obtained from different regions of Turkey were investigated. Samples with high CaO content had high phosphate adsorption capacity. It is concluded that pumice is an effective adsorbent for phosphate if its CaO content is high. The adsorption capacity of a pumice powder sample was calculated from the area under the curve of the plot phosphate concentration vs volume of the effluent as 0.95 mg PO4-3 g(-1) pumice powder. Variation of pH, conductivity(S) and redox potential (mV) was also measured during the column experiment. Langmuir and Freundlich adsorption isotherm constants and correlation coefficients were calculated and compared. It was concluded that the adsorption data of phosphate onto pumice powder fitted to the Freundlich adsorption isotherm more than the Langmuir model. Specific surface areas of the pumice powder were calculated at pH 3, 5, 7 and 9. The compounds present in actual waste water have no significant effect on the removal of phosphate. Pumice powder can be regenerated by dilute NaOH and reused

    Differential Pulse Polarographic Determination of Proquazone

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    825-82

    Body mass index and complications following major gastrointestinal surgery: A prospective, international cohort study and meta-analysis

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    Aim Previous studies reported conflicting evidence on the effects of obesity on outcomes after gastrointestinal surgery. The aims of this study were to explore the relationship of obesity with major postoperative complications in an international cohort and to present a metaanalysis of all available prospective data. Methods This prospective, multicentre study included adults undergoing both elective and emergency gastrointestinal resection, reversal of stoma or formation of stoma. The primary end-point was 30-day major complications (Clavien–Dindo Grades III–V). A systematic search was undertaken for studies assessing the relationship between obesity and major complications after gastrointestinal surgery. Individual patient meta-analysis was used to analyse pooled results. Results This study included 2519 patients across 127 centres, of whom 560 (22.2%) were obese. Unadjusted major complication rates were lower in obese vs normal weight patients (13.0% vs 16.2%, respectively), but this did not reach statistical significance (P = 0.863) on multivariate analysis for patients having surgery for either malignant or benign conditions. Individual patient meta-analysis demonstrated that obese patients undergoing surgery formalignancy were at increased risk of major complications (OR 2.10, 95% CI 1.49–2.96, P < 0.001), whereas obese patients undergoing surgery for benign indications were at decreased risk (OR 0.59, 95% CI 0.46–0.75, P < 0.001) compared to normal weight patients. Conclusions In our international data, obesity was not found to be associated with major complications following gastrointestinal surgery. Meta-analysis of available prospective data made a novel finding of obesity being associated with different outcomes depending on whether patients were undergoing surgery for benign or malignant disease
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