116results about "Element presence detection by oxidation" patented technology

A method and system for performing low level sulfur UV fluorescence measures including an UV interference reduction system which removes or destroys interfering nitrogen oxides. The preferred nitrogen removal systems include introducing ozone into the system in sufficient quantities to destroy any produce NO and optionally a nitrogen sparge or similar nitrogen gas removal system.

The present invention provides a method for measuring total organic carbon content by removing the influence of nitrogen components. This method obtains the total organic carbon content through the following process, namely: (1) adjusting the hydrogen ion concentration of the sample water to the range of pH 4 to 6, (2) oxidizing and decomposing the organic matter contained in the sample water to carbon dioxide, Nitrogen compounds are oxidatively decomposed into nitrous acid, (3) carbon dioxide is allowed to permeate into the measurement water through the gas permeable part (5a), and (4) the electrical conductivity of the measurement water is measured.

An automated analyser is described for determining, by way of combustion, nitrogen contained in organic compounds, in particular proteins present in foods, animal feeds, polymers, fuels etc., characterised in that the carbon dioxide absorption device upstream of the nitrogen detector is self-regenerating and comprises: a distributor valve able to switch different gas circuits without contaminations and losses from one gas sample to another, a carousel consisting of a plurality of absorber elements inside which is placed an adsorbent material, a furnace suitable for said adsorbers, in such a manner that each of said adsorbers presents itself in turn for each analysis and that on completion of said analysis the same adsorber is conveyed to the furnace for degassing of the absorbent material and thus for its relative regeneration.

A reagent assembly for a combustion tube includes a reagent tube which is sealably and removably coupled to the open end of the combustion tube such that, when the reagent in the reagent tube is depleted, it can be easily removed without disassembly of the furnace or changing the combustion tube. The reagent tube includes a twist-lock cap to facilitate removal of the reagent tube.

A device for measuring total organic carbon includes an organic substance oxidative decomposition section (4) for converting organic carbon contained in sample water into carbon dioxide, a carbon dioxide extraction section (6) for extracting carbon dioxide generated in the organic substance oxidative decomposition section (4) into measurement water, and a detection section for measuring the conductivity of the measurement water discharged from the carbon dioxide extraction section (6) to determine the amount of the extracted carbon dioxide. A syringe pump (12) is provided downstream of the detection section (11) in a measurement flow path (16) through which measurement water flows to pass through the carbon dioxide extraction section 6 and the detection section (11). The flow rate of measurement water during measurement of conductivity in the detection section (12) is controlled by suction into the syringe pump.

Methods and apparatus are disclosed for determination of the total concentration of organic carbon compounds in aqueous process streams utilizing a pulsed-flow technique for irradiating a water sample in a chamber (3) with UV or similar wavelength radiation.

The invention discloses a dynamic soft measuring method of 4-CBA content based on a convolutional neural network. The dynamic soft measuring method of the 4-CBA content based on the convolutional neural network is used for calculating the content of 4-CBA generated in the PTA oxidation process. The dynamic soft measuring method of the 4-CBA content based on the convolutional neural network comprises the following steps: firstly, constructing a mapping relation between an input and an output of a dynamic soft measurement model on the basis of the convolutional neural network, using a time sequence data block of a relevant measurable variable in the PTA oxidation process as the input of the dynamic soft measurement model and using the 4-CBA as the output of the dynamic soft measurement model; secondly, inputting the time sequence data block into the convolutional neural network in which convolutional layers and pooling layers are alternately distributed, wherein the layer numbers of theconvolutional layers and the pooling layers are both 2, the first layer of pooling adopts characteristics after convolution is extracted in a one-dimensional max-pooling manner, and the second layer of pooling adopts max-pooling equivalent to the sizes of characteristic graphs output by the convolutional layers to perform sampling; calculating the output of the last layer of pooling by using a linear function to obtain an output result; and comparing the result with 4-CBA analysis data and updating parameters. The dynamic soft measuring method of the 4-CBA content based on the convolutional neural network, disclosed by the invention, has the advantages that the dynamic soft measurement model is simple and easy to realization, and the measurement accuracy of the model is improved.

Disclosed is a method for the quantitative analysis of a metal element contained in a resin material, which permits quantitatively analyzing the harmful substance such as lead contained in a resin material, comprising decomposing the resin material within a container having at least the inner surface formed of a glassy carbon in the presence of an aqueous solution of an oxidizing acid, heating the organic residue of the decomposed resin material so as to convert the residue into an ash, and quantitatively measuring the metal element contained in the organic residue converted into the ash.

A method is provided for characterizing and quantifying the pyritic sulfur and the organic sulfur separately in a sedimentary rock sample. A rock sample is subjected to a heating process in an inert atmosphere, the effluents resulting from the heating in the inert atmosphere are continuously oxidized, the released SO2 is continuously measured, and a pyrolysis sulfur content and a pyrolysis pyriticsulfur content are deduced. The residue heated in the inert atmosphere is heated in an oxidizing atmosphere, the released SO2 is continuously measured, and at least oxidation sulfur content is deduced therefrom. The pyritic sulfur content is determined from the pyritic pyrolysis sulfur content and a weighting function taking account of a first parameter representing a thermal degradation rate ofthe pyrite, a second parameter representing the impact of the mineral matrix, and a third parameter representing the impact of the organic matrix. In addition, the organic sulfur content can be determined from at least the oxidation sulfur content, the pyrolysis sulfur content and the pyritic sulfur content. Application: in particular to oil exploration and exploitation.

A portable diesel fuel tester and a method of its use are provided. A sample of diesel fuel is placed in a sample tray of the tester. The diesel fuel is heated to a gas state and circulated to a SO2 sensor by an air pump. The SO2 sensor determines the level of sulfur in the diesel fuel based on the SO2 levels. The sulfur level is displayed on an LCD screen for viewing by the user.