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A Cappiello

Publications and source records attributed to A Cappiello.

23 records · Page 2Linked to original sources
PubMed1988

Determination of trace organic compounds in effluents from a coal-fired power plant.

Solid and gaseous emissions from a power plant fired with South African coal and maintained at full load (320 MWe) were characterized for their composition in polynuclear aromatic hydrocarbons (PAH) and n-alkanes (n-A). 25 n-A (from C12 to C36) and 34 PAH (from naphthalene to coronene) were determined by gas chromatography/mass spectrometry. Samples were collected in different points of the plant: the bottom hopper of the boiler, the electrostatic precipitator (ESP) hopper and the ductwork system before and after the ESP. The pulverized coal was also analysed by the same procedure in order to find any correlation with the composition of emissions. PAH concentration profiles of the coal and the combustion products, which will be useful for evaluation of environmental impact, were obtained.

Air Pollutants, Occupational↗
PubMedDate not supplied

New trends in the application of electron ionization to liquid chromatography-mass spectrometry interfacing.

I. Introduction 88 II. Cap-EI Interface 90 A. Interface Performance 92 III. Direct-EI Interface 93 A. Interface Performance 97 IV. Conclusions 103 Acknowledgments 103 References 103 --Two recent approaches for coupling capillary scale liquid chromatography and electron ionization mass spectrometry are reviewed and discussed. The first one, Cap-EI, is the latest evolution of the micro-scale particle beam interface, in which the nebulizer has been optimized to overcome the limitations of the former approach, in terms of sensitivity and linearity. It can be easily hosted in pre-existing instruments without major modifications and can use helium and the less-expensive nitrogen to generate library-matchable electron ionization spectra. The second one is a miniaturized interface for nano- and micro-HPLC, in which the interfacing process takes place into a suitably modified ion source. Because the eluate from the column is completely transferred into the ion source for ionization, superior sensitivity, linearity, and reproducibility are obtained. No signs of chemical ionization are observed at flow rates up to 1.5 microL/min. These two interfaces demonstrate that electron ionization can be successfully used for the analysis of small-medium molecules of various polarities, and also at the trace level. The possibility to record library-matchable electron ionization spectra offers the analyst a powerful tool that can be particularly useful in real-world applications.

Caffeine↗
PubMedDate not supplied

Survival after pancreaticoduodenectomy for ductal adenocarcinoma of the head of the pancreas.

Recent reports have demonstrated an improvement in 5-year actuarial survival of patients with resected ductal adenocarcinoma. The purpose of this study was to determine the factors favoring long-term survival after pancreaticoduodenectomy. Between 1974 and 1995, 75 patients with pancreatic head carcinoma underwent pancreaticoduodenectomy in our department. The overall postoperative mortality rate was 5.3% and morbidity was 24%. Median survival following resection was 17 months. The estimated 1-, 2- and 5-year survival rates were 68%, 46.7% and 18.7%, respectively. Five-year survival was significantly greater for node-negative versus node-positive patients (41.7% vs 7.8%, P < 0.001), for smaller (< 3 cm) versus larger tumours (33.3% vs 8.8%, P < 0.006), and for negative versus positive resection margins (23.3% vs 0, P < 0.001). Other factors, including gender, age, and blood transfusion had no significant effect on survival. The multivariate analysis was done using the Cox proportional hazards model to determine independent prognostic determinants of survival. The presence of positive resection margins was the strongest independent predictor of decreased survival. Lymph node metastasis, tumour size > 3 cm, and poor histologic differentiation were also independent predictors of poor survival. The most favorable subset consisted in 17 patients who had negative resection margins, negative lymph nodes, and tumor size < 3 cm. Their 5-year survival rate was 52.9%.

Adult↗