A Convenient Method for Oxidation of Organophosphorus Pesticides in Organic Solvents

Abstract Several techniques have been previously described for obtaining the infrared absorption spectra of various types of rubbers. The most convenient method is to dissolve the substance under investigation in a suitable solvent and obtain the spectrum as a solution employing a sealed liquid cell. Another technique that is commonly employed is to evaporate a benzene solution of the polymer to dryness on a rock salt plate, thus obtaining a film. A more time consuming procedure consists of floating a polymer solution on a mercury pool which can subsequently be picked up by a steel frame and studied as a film. All the above procedures, although useful when investigating low gel rubbers, cannot be successfully employed with high gel rubbers. Modified polybutadiene crumb rubbers form extremely stable gels, and are almost completely insoluble in all common organic solvents. Because of this great insolubility, one is limited in infrared sample preparation. Attempts to employ the KBr pressed disc technique have met with very little success in our laboratory.

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Iron-Containing Hypercrosslinked Composite Prepared From Polystyrene Foam Plastic in the Sorption of Toxic and Foul-Smelling Substanc

INEOS OPEN ◽

10.32931/io2101a ◽

2021 ◽

Author(s):

S. E. Lyubimov ◽

◽

A. A. Zvinchuk ◽

A. Yu. Popov ◽

M. M. Ilyn ◽

...

Keyword(s):

Hydrogen Sulfide ◽

Organic Solvents ◽

Convenient Method ◽

Hypercrosslinked Polystyrene ◽

Plastic Waste ◽

Foam Plastic ◽

Polystyrene Foam ◽

Toxic Organic Solvents

A convenient method for obtaining an iron-containing hypercrosslinked polystyrene composite based on foam plastic waste is developed. The iron-containing composite can be used for the sorption of hydrogen sulfide, toxic organic solvents, as well as foul-smelling and toxic products of degradation of natural remains—putrescine, cadaverine, indole, and skatole.

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Stimulated sequential dehydroxy-fluorination: a safe, convenient method for gas chromatographic analysis of phosphate diesters with possible application to hydrolysates of organophosphorus pesticides and nerve gases

Journal of Chromatography A ◽

10.1016/s0021-9673(00)81851-8 ◽

1980 ◽

Vol 192 (1) ◽

pp. 173-184 ◽

Cited By ~ 3

Author(s):

Wayne H. Griest ◽

T.W. Martin

Keyword(s):

Convenient Method ◽

Chromatographic Analysis ◽

Organophosphorus Pesticides ◽

Gas Chromatographic Analysis ◽

Phosphate Diesters

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Thickness and composition determinations from T.E.M. specimens using both x-ray and backscattered electron data

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100112816 ◽

1984 ◽

Vol 42 ◽

pp. 576-577

Author(s):

M.D. Ball ◽

H. Lagace ◽

M.C. Thornton

Keyword(s):

Electron Microscope ◽

Atomic Number ◽

Transmission Electron Microscope ◽

Convenient Method ◽

Flow Chart ◽

X Ray ◽

Intensity Measurements ◽

Transmission Electron ◽

Electron Intensity ◽

Backscattered Electron

The backscattered electron coefficient η for transmission electron microscope specimens depends on both the atomic number Z and the thickness t. Hence for specimens of known atomic number, the thickness can be determined from backscattered electron coefficient measurements. This work describes a simple and convenient method of estimating the thickness and the corrected composition of areas of uncertain atomic number by combining x-ray microanalysis and backscattered electron intensity measurements.The method is best described in terms of the flow chart shown In Figure 1. Having selected a feature of interest, x-ray microanalysis data is recorded and used to estimate the composition. At this stage thickness corrections for absorption and fluorescence are not performed.

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Stereo imaging in the shadow electron microscope

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100107745 ◽

1978 ◽

Vol 36 (1) ◽

pp. 120-121

Author(s):

W. C. T. Dowell

Keyword(s):

Electron Microscopy ◽

Electron Microscope ◽

Convenient Method ◽

Patent Application ◽

Standard Technique ◽

Stereo Imaging ◽

Stereo Images ◽

Specimen Height

Stereo imaging is not new to electron microscopy. Von Ardenne, who first published transmission pairs nearly forty hears ago, himself refers to a patent application by Ruska in 1934. In the early days of the electron microscope von Ardenne employed a pair of magnetic lenses to view untilted specimens but soon opted for the now standard technique of tilting the specimen with respect to the beam.In the shadow electron microscope stereo images can, of course, be obtained by tilting the specimen between micrographs. This obvious method suffers from the disadvantage that the magnification is very sensitive to small changes in specimen height which accompany tilting in the less sophisticated stages and it is also time consuming. A more convenient method is provided by horizontally displacing the specimen between micrographs. The specimen is not tilted and the technique is both simple and rapid, stereo pairs being obtained in less than thirty seconds.

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Rotary Beveling for In Situ Thin-Section Microscopy of Cell Cultures

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100099192 ◽

1981 ◽

Vol 39 ◽

pp. 550-551

Author(s):

Dean A. Handley ◽

Jack T. Alexander ◽

Shu Chien

Keyword(s):

Cell Growth ◽

Cell Cultures ◽

Molecular Interactions ◽

Convenient Method ◽

Petri Dish ◽

Simple Method ◽

Thin Section Microscopy ◽

Thin Sectioning ◽

Organic Fluids

In situ preparation of cell cultures for ultrastructural investigations is a convenient method by which fixation, dehydration and embedment are carried out in the culture petri dish. The in situ method offers the advantage of preserving the native orientation of cell-cell interactions, junctional regions and overlapping configurations. In order to section after embedment, the petri dish is usually separated from the polymerized resin by either differential cryo-contraction or solvation in organic fluids. The remaining resin block must be re-embedded before sectioning. Although removal of the petri dish may not disrupt the native cellular geometry, it does sacrifice what is now recognized as an important characteristic of cell growth: cell-substratum molecular interactions. To preserve the topographic cell-substratum relationship, we developed a simple method of tapered rotary beveling to reduce the petri dish thickness to a dimension suitable for direct thin sectioning.

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