The Experts below are selected from a list of 201 Experts worldwide ranked by ideXlab platform
Mustafa Soylak - One of the best experts on this subject based on the ideXlab platform.
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separation preconcentration of silver i and lead ii in environmental samples on cellulose nitrate Membrane Filter prior to their flame atomic absorption spectrometric determinations
Journal of Hazardous Materials, 2007Co-Authors: Mustafa SoylakAbstract:Abstract An enrichment method for trace amounts of Ag(I) and Pb(II) has been established prior to their flame atomic absorption spectrometric determinations. The preconcentration/separation procedure is based on chelate formation of Ag(I) and Pb(II) with ammonium pyrrolidine dithiocarbamate (APDC) and on retention of the chelates on cellulose nitrate Membrane Filter. The influences of some analytical parameters including pH and amounts of reagent, etc. on the recoveries of analytes were investigated. The effects of interferic ions on the quantitative recoveries of analytes were also examined. The detection limits (k = 3, N = 11) were 4.6 μg L−1 for silver(I) and 15.3 μg L−1 for lead(II). The relative standard deviations (R.S.D.) of the determinations for analyte ions were below 3%. The method was applied to environmental samples for the determination of analyte ions with satisfactory results (recoveries >95%).
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Enrichment and determinations of nickel(II), cadmium(II), copper(II), cobalt(II) and lead(II) ions in natural waters, table salts, tea and urine samples as pyrrolydine dithiocarbamate chelates by Membrane filtration–flame atomic absorption spectromet
Analytica Chimica Acta, 2003Co-Authors: Ibrahim Narin, Mustafa SoylakAbstract:A Membrane filtration procedure for the preconcentration of nickel(II), cadmium(II), copper(II), cobalt(II) and lead(II) ions has been established. The analytes were adsorbed on cellulose nitrate Membrane Filter as their ammonium pyrrolydine dithiocarbamate (APDC) complexes. Then Membrane Filter was dissolved by using nitric acid. The levels of the analytes in the final solutions were determined by flame atomic absorption spectrometry (FAAS). The analytical parameters including pH, amounts of APDC, sample volume, matrix effects, etc. have been optimized. The present method has been successfully applied for the FAAS determinations of analyte ions in a stream sediment reference material (GBW 07309), table salts and natural water samples with good results, e.g. recoveries greater than 95%, relative standard deviations generally lower than 9%. The analyte ion levels of the microwave digested urine and black tea samples were also analyzed by using proposed preconcentration procedure.
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preconcentration of cr iii co ii cu ii fe iii and pb ii as calmagite chelates on cellulose nitrate Membrane Filter prior to their flame atomic absorption spectrometric determinations
Talanta, 2002Co-Authors: Mustafa Soylak, Umit Divrikli, Latif Elci, Mehmet DoganAbstract:Abstract A method for the preconcentration and determination of Cr(III), Co(II), Cu(II), Fe(III) and Pb(II) ions by atomic absorption spectrometry has been described. The method was based the collection of metal–calmagite complexes on a soluble cellulose nitrate Membrane Filter. The detection of the solution was obtained by flame atomic absorption spectrometry (FAAS) after completely dissolving the Membrane with 0.5 ml of nitric acid at 80 °C. The metal ions were recovered quantitatively at pH 8. Various factors which affect the collection and determination of metal ions such as, type and size of the Membrane Filter, solvent for dissolution of the species retained on the Filter were investigated. The detection limits were varying 0.06 μg l−1 for Cu to 2.5 μg l−1 for Cr. An application of the proposed method for analyte ions in mineral and tap water samples was also described with satisfactory results (recoveries >95%, relative standard deviations
Garry Burdett - One of the best experts on this subject based on the ideXlab platform.
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A comparison of historic asbestos measurements using a thermal precipitator with the Membrane Filter-phase contrast microscopy method
Annals of Occupational Hygiene, 1998Co-Authors: Garry BurdettAbstract:The published results and analytical methods used in a 1938 survey of the spinning area in a UK crocidolite asbestos factory have been described and re-interpreted, by comparing the method used with the current Membrane Filter-phase contrast microscopy (MF-PCM) method for asbestos. By good fortune, most of the original microscope, and thermal precipitator sampling heads similar to those used for sampling were available, as well as guidance from the factory inspector who collected and analysed the original samples. A textile grade crocidolite asbestos was used to generate a fibrous dust cloud whose size distribution was characterised by scanning and transmission electron microscopy and found to give a close approximation to the fibre size distributions monitored in 1938. Samples taken over the same sampling time, but at lower concentrations than originally sampled, showed that the thermal precipitator-oil immersion microscopy (TP-OI) method used at x 2000 magnification, gave higher > 5 μm long fibre counts by a factor of between 3 and 4, than the current MF-PCM method. The differences in performance could be explained by the superior resolving power of the TP-OI method for fine crocidolite fibres. Exposures of airborne asbestos fibres in the spinning area were found to be equivalent to about 20 fml-1for personal samples and 10 fml-1for area samples, but due to the high levels of ventilation on the day the samples were collected, the average levels throughout the year may have been somewhat higher.
Mehmet Dogan - One of the best experts on this subject based on the ideXlab platform.
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preconcentration of cr iii co ii cu ii fe iii and pb ii as calmagite chelates on cellulose nitrate Membrane Filter prior to their flame atomic absorption spectrometric determinations
Talanta, 2002Co-Authors: Mustafa Soylak, Umit Divrikli, Latif Elci, Mehmet DoganAbstract:Abstract A method for the preconcentration and determination of Cr(III), Co(II), Cu(II), Fe(III) and Pb(II) ions by atomic absorption spectrometry has been described. The method was based the collection of metal–calmagite complexes on a soluble cellulose nitrate Membrane Filter. The detection of the solution was obtained by flame atomic absorption spectrometry (FAAS) after completely dissolving the Membrane with 0.5 ml of nitric acid at 80 °C. The metal ions were recovered quantitatively at pH 8. Various factors which affect the collection and determination of metal ions such as, type and size of the Membrane Filter, solvent for dissolution of the species retained on the Filter were investigated. The detection limits were varying 0.06 μg l−1 for Cu to 2.5 μg l−1 for Cr. An application of the proposed method for analyte ions in mineral and tap water samples was also described with satisfactory results (recoveries >95%, relative standard deviations
H Brust-carmona - One of the best experts on this subject based on the ideXlab platform.
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[The evaluation of the integral water treatment system of a general hospital in Mexico City]
Salud Publica Mex, 1990Co-Authors: J Juarez-mendoza, G Martinez-rosales, J Diaz-sanchez, L Perez-guadarrama Mde, H Brust-carmonaAbstract:The Mexican Health Office (SSA) promotes the use and progeny of the appropriate technology for the bacteriological quality evaluation and disinfect the water by means of the in situ progeny of the clorus and ozonus gases when needed, for the human consumption in suburban and rural communities. The clorus water disinfecting conventional methods by many reasons are useless, even in urbanized cities. CEDAT has built and design a group of apparatus, called: "Water treatment whole equipment for small communities", and it's build up by: Membrane Filter, Double Chamber Incubator, ultraviolet Light Sterilizer and a clorus and ozonus progenic gas electrolytic cell with CA and CD power box and a Venturi Tube. The electrolytic cell raw material is the sodium chlorine (salt) water mixed. The evaluation of these equipment was made at the Manuel Gea Gonzalez Medical Doctor General Hospital. During 38 days there was a daily measure of chlorine sewage in six different parts of the hospital. It was used the cellulose Membrane Filter technic with a 0.45 mm porus and a sowing in M-Endo and M-FC Broth cultivation was in a 37 and 44 centigrade incubation. The first 10 days chlorine sewage was found, the last 28 weren't measurable. Total coliforms in 23 of 42, 7 days samples and excrement coliforms in 5 of 18, 3 days samples, were developed during the 38 days period. The electrolytic cell was settled for the water gas measure up in its way to the reservoir. Afterwards chlorine sewage was measured from 0.2 mg/l to 1 mg/l in all the sample parts. No germ kind was discovered during the 10 days sampling.(ABSTRACT TRUNCATED AT 250 WORDS)
Izumi Ichinose - One of the best experts on this subject based on the ideXlab platform.
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General method for ultrathin free-standing films of nanofibrous composite materials
Journal of the American Chemical Society, 2007Co-Authors: Xinsheng Peng, Emma M. Ericsson, Jian Jin, Izumi IchinoseAbstract:A simple and general method for the preparation of ultrathin, large-area, free-standing films of nanofibrous composite materials was developed. First, positively charged cadmium hydroxide nanostrands of 1.9 nm in diameter and micrometers in length were prepared by mixing dilute aqueous solutions of cadmium chloride and aminoethanol. Negatively charged dye molecules, proteins, nanoparticles, and water-soluble fullerene or carbon nanotubes were mixed with the nanostrands to give a well-dispersed solution of the corresponding nanofibrous composites. After filtration of the dispersions with a polycarbonate Membrane Filter, uniform films with a thickness of a few tens to hundreds of nanometers and a diameter of a few centimeters were obtained. The films were readily peeled off from the Membrane Filter by immersion in ethanol. The resultant free-standing films could be further transferred to other substrates, such as quartz plate, gold electrode, and porous alumina Membrane, and were characterized by scanning and transmission electron microscopies. We provide herein various nanofibrous free-standing films with optical, biological, metallic, and magnetic properties.