摘要:
To provide a mercury measuring apparatus of a closed system capable of performing automatically a process ranging from collection to injection of the sample composed mainly of hydrocarbon, which is effective to accomplish a highly reliable measurement. The mercury measuring apparatus 100 includes a column 1 filled with a first adsorbent 11 and a reducing agent 13, an injecting unit 3 for injecting a sample into the column 1, a first heating unit 12, a second heating unit, a mercury collecting tube 18 filled with a second adsorbent 17, a third heating unit 19, a mercury measuring unit 2, gas flow passages FP1, FP2 and FP4, flow switching valves V1 to V3, V5 and V6 for selecting one of the gas flow passages FP1, FP2 and FP4, and a control unit 4.
摘要:
Process for metering lead in a sample of original water, in which is placed a sample of the water of which at least a substantial portion of the colloidal and organic material is passed in solution (sample of pretreated water), having: a first stage, starting from a sample of pretreated water with an adjusted pH, the lead is concentrated and the other parasitic ions are at least partially eliminated to obtain a sample of water that is concentrated with lead and substantially lacking in other parasitic ions (sample of lead-concentrated water); and a second stage in which, starting from the sample of lead-concentrated water, the sample of lead-concentrated water is mixed with a selective, lead-sensitive fluorescent probe whose fluorescence intensity/lead metering function is known; then, the thus produced water/fluorescent probe mixture is excited by the light, and the fluorescence intensity of the thus excited water/fluorescent probe mixture is collected optically; finally, starting from the thus detected fluorescence intensity, the lead metering of the sample to be metered is determined based on the fluorescence intensity/lead metering function.
摘要:
This method for assaying copper in silicon wafers includes the steps of: forming a polysilicon layer on the surface of a p-type silicon wafer having the same characteristics as the silicon wafers being assayed; heat treating the p-type silicon wafer after it has been polished; dissolving the polysilicon layer on the heat-treated p-type silicon wafer with a mixed acid composed of at least hydrofluoric acid and nitric acid; and quantitatively determining the copper components within the mixed acid following dissolution of the polysilicon layer.
摘要:
The invention relates to a method for sampling a sulphur-containing solid product including supplying a gas flow comprising hydrogen sulphide, bringing the gas flow into contact with a solid reagent and reacting the solid reagent with the hydrogen sulphide contained in the gas flow, the reaction fixing the sulphur of the hydrogen sulphide by forming a sulphur-containing solid product which is different in colour from the solid reagent, and recovering the sulphur-containing solid product. The invention also relates to a device suitable for the implementation of this method.
摘要:
To provide a process, whereby a low molecular weight organic compound having at most 20 carbon atoms present in a trace amount in a cloth made of chemical fibers treated with a water and oil repellent agent, can be accurately analyzed.A process for analyzing a low molecular weight organic compound having at most 20 carbon atoms in a cloth made of chemical fibers treated with a water and oil repellent agent, which comprises (a) a step of dissolving the cloth made of chemical fibers treated with a water and oil repellent agent in a solvent capable of dissolving a resin constituting the cloth, to obtain a solution, (b) a step of mixing the solution with a solvent capable of agglomerating the resin to agglomerate the resin, to obtain a liquid containing a resin agglomerate, (c) a step of subjecting the liquid containing a resin agglomerate to solid-liquid separation to obtain a liquid phase, and (d) a step of measuring the concentration of a low molecular weight compound having at most 20 carbon atoms in the liquid phase by means of a liquid chromatograph-mass spectrometer, a liquid chromatograph-tandem mass spectrometer, a gas chromatograph-mass spectrometer or a gas chromatograph-tandem mass spectrometer.
摘要:
A method known in prior art for determining the occupation of the surface of a silica glass component with impurities comprises taking a sample, a process in which at least some of the surface of the silica glass component is brought in contact with an acidic desorption solution, and surface impurities that are to be analyzed are accumulated therein and are subjected to an element-specific analysis. The aim of the invention is to create a method which is based on said method, allows the occupation of the surface of silica glass components to be determined accurately and reproducibly, and is suited for determining small amounts of impurities within the order of magnitude of 1010 atoms/cm2 also directly in situ. Said aim is achieved by the fact that taking the sample encompasses contacting the component surface with an acidic desorption solution containing water, nitric acid, and hydrofluoric acid, the nitric acid concentration in the desorption solution amounting to 1.5 to 5 times the hydrofluoric acid concentration (in percent by volume), provided that the contact time and the contact temperature are adjusted such that a maximum of 0.5 ?m of the component surface are removed.
摘要:
A stationary medium is employed both to separate chemicals from a sample solution and also to generate surface-enhanced Raman scattering, so that spectral analysis of the separated analyte chemical can be performed. Applied driving force causes the sample to flow into the stationary medium and to distribute therethrough, thereby causing rapid separation of the analyte chemical, and surface-enhanced Raman scattered radiation is quickly detected, at a plurality of locations along a flow path defined by the stationary medium, for ultimate analysis.
摘要:
The teaching provides a method for selectively lysing sperm cells in a mixed cell sample, particularly in the field of forensic sciences. Reagents and kits for carrying out the methods are also provided.
摘要:
The accelerated testing of articles for the leachability of metals into a fluid stream is accomplished by contacting the article with an extraction solution, ultrasonically agitating the solution with optional heating, and analyzing the solution for the presence of extracted metals. A particular extraction solution for assessing the extractability of metals into drinking water includes bicarbonate and a free halogen.
摘要:
A method and apparatus are disclosed that are useful in bench top sample preparation and filtration techniques, including those related to microwave assisted extraction and partial digestion. In one aspect the method includes the steps of positioning a microwave-transparent matrix removal tool in a microwave transparent reaction vessel adding a matrix-based composition to the microwave reaction vessel containing the removal tool, applying microwave radiation to the reaction vessel, the matrix-based composition, and the matrix removal tool, and removing the matrix based composition from the reaction vessel using the matrix removal tool. In another aspect the method includes the steps of positioning a matrix based composition that includes at least some liquid in a filter vessel, and applying a moderate over-pressure to the composition upstream of the filter to accelerate the movement of liquid through the filter.