Method for distinctly characterizing and quantifying the pyritic sulfur and the organic sulfur of a sedimentary rock sample.

A rock sample is subjected to a heating sequence in an inert atmosphere, the effluents resulting from this heating in an inert atmosphere are continuously oxidized, the SO.sub.2 released is continuously measured, and a pyrolysis sulfur content and a pyrolysis pyritic sulfur content are deduced therefrom. The residue from heating in an inert atmosphere is then heated in an oxidizing atmosphere, the SO.sub.2 released is continuously measured and at least an oxidation sulfur content is deduced therefrom. The pyritic sulfur content is determined from the pyrolysis pyritic sulfur content and from a weighting function taking account of a first parameter representing a pyrite thermal degradation rate, a second parameter representing the impact of the mineral matrix and a third parameter representing the impact of the organic matrix. The organic sulfur content can further be determined from at least the oxidation sulfur content, the pyrolysis sulfur content and the pyritic sulfur content.

Application: notably petroleum exploration and exploitation.

The present invention concerns an analytical method that makes use of an oxygen-containing source having a predetermined content of an isotope of oxygen .sup.ZO, which is not the same as natural composition and distribution of oxygen isotopes, to detect and/or quantify oxygen in oxidizable compound(s).

The analytical method allows detecting and/or quantification with relatively high precision and accuracy oxygen in oxidizable compound(s), even at low content. The method is easy to implement and can be used for in-line analysis.

The present invention provides a catalytic conversion-type sensor that detects a detection target gas by detecting a conversion gas produced through a reaction, the catalytic conversion-type sensor including: a gas flow path that allows the detection target gas to flow down; and a conversion portion that is connected to the gas flow path, the conversion portion including, on a side partitioned by a diffusion means that allows the detection target gas to naturally diffuse, a heated catalyst portion that produces a conversion gas by causing the detection target gas to come into contact with a heated catalyst and react with the heated catalyst, and a sensor element portion that is capable of detecting the conversion gas produced through the reaction.

The present disclosure relates to compositions and methods for diagnosis, research, and screening for chemicals in biological fluids (e.g., related to methanol poisoning). In particular, the present disclosure relates to point of care systems and methods for detecting formic acid or formate, in biological fluids by means of natural or recombinant formate oxidase.

In this system, the carbon component of atmospheric particulate matter (PM2.5) is measured by: heating a sample in a first oven under such conditions as to fractionate the carbon component into carbon fractions; completely converting each carbon fraction into carbon dioxide gas in a second oven; and then measuring the amount of carbon dioxide gas in the carbon fraction precisely. In the system, the problem that a TCD detector cannot measure a low-concentration fraction is solved by using a combustion gas in a non-diluted state, though a combustion gas diluted 150-fold is used in a conventional elemental analyzer. Thus, the present invention develops an international standard instrument in which one standard sample is used and which enables simple standardized measuring acceptable to The International System of Units (SI).

The present invention relates generally to the generation of steam via the use of a combustion process to produce heat and, in one embodiment, to a device, system and/or method that enables one to control one or more process parameters of a combustion process so as to yield at least one desirable change in at least one downstream parameter. In one embodiment, the present invention is directed to a system and/or method for controlling at least one process parameter of a combustion process so as to yield at least one desirable change in at least one downstream process parameter associated with one or more of a wet flue gas desulfurization (WFGD) unit, a particulate collection device and/or control of additives thereto and/or a nitrogen oxide control device and/or control of additives thereto and/or additives to the system.

Provided is a water quality analysis device capable of keeping the device in a clean state without leaving an operation at the time of device power supply activation to an operator and without wasting time and wash water. The water quality analysis device is configured such that: a memory 21 capable of storing a stored content in a cut-off state of the device power supply is provided; the states of the vessels, such as an IC reactor 1 and a TC reactor 2, in which sample water is injected at the time of an analysis operation are sequentially stored in the memory 21; contents of the memory 21 are read at the time of the device power supply activation; and a cleaning operation is automatically executed according to prescribed procedures with the states read for each reactor 1 and 2 as a starting point. Thus, even after the power supply interruption due to, e.g., power outage, the device is kept in a clean state with minimum necessary operations.

A apparatus 70 for measuring ammonia concentration includes an electromotive force acquisition section 75 configured to acquire information about an electromotive force EMF of a mixed potential cell 55 while a detection electrode 51 is exposed to a target gas, an oxygen concentration acquisition section 76 configured to acquire information about oxygen concentration p.sub.O2 in the target gas, and a control section 72. The control section 72 derives ammonia concentration p.sub.NH3 in the target gas from the acquired information about the electromotive force EMF, the acquired information about the oxygen concentration p.sub.O2, and the relationship represented by formula (1):

EMF= log.sub.a(p.sub.NH3) log.sub.b(p.sub.O2)+B(1)

where , , and B each represent a constant, and a and b each represent any base (provided that a1, a>0, b1, and b>0).

A gas-liquid separator includes a reception port to which a sample is supplied, a gas flow pipe through which gas in the sample supplied to the reception port is sent to the outside, a storage pipe where liquid in the sample supplied to the reception port is stored, and a waste solution disposition port for disposition of liquid stored in the storage pipe to the outside. The storage pipe includes a first storage portion that communicates with the reception port and is arranged in an area vertically below the reception port, a second storage portion that communicates with the waste solution disposition port and is arranged in an area vertically below the waste solution disposition port, and a communication portion that allows communication between a vertically lower end of the first storage portion and a vertically lower end of the second storage portion.

Provided herein is a method determining the concentration of impurities in a carbon material, comprising: mixing a flux and a carbon material to form a mixture, wherein the carbon material is selected from the group consisting of graphene, carbon nanotubes, fullerene, carbon onions, graphite, carbon fibers, and a combination thereof; heating the mixture using microwave energy to form fused materials; dissolution of the fused materials in an acid mixture; and measuring the concentration of one or more impurities.