The present invention relates to a sensor (1) for sensing organic carbon in a liquid (L), comprising: a container (2) having an interior space (20) for receiving the liquid (L), a photodetector (3), and a light source (4) configured to emit ultraviolet light (5) so that the ultraviolet light (5) travels along an optical path (P) through liquid (L) residing in the interior space (20) and is absorbable by carbon bonds of organic molecules in the liquid (L). According to the present invention, the photodetector (3) is configured to detect light in the visible or infrared spectrum, and the sensor (1) comprises a down conversion material portion (22; 22a) arranged in the optical path, wherein the down conversion material portion (22; 22a) is configured to receive incoming ultraviolet light (5) emitted by the light source (4) and to down convert received ultraviolet light (5) and to emit said down converted light (50) in the visible or infrared spectrum so that emitted down converted light (50) impinges on the photodetector (3).

Methods for enhanced oil recovery from subterranean formations by treating a produced water prior to injection into the subterranean hydrocarbon reservoir and manipulating produced water compositions to increase the rate and/or amount of oil that is recovered from producing wells and/or a hydrocarbon reservoir. The treatment of the produced water can increase the pH of the water from about 0.75 to about 2.0.

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 method for measuring TOC in test water is disclosed. Test water is injected into a combustion tube, which is controlled to be heated in a state of flowing carrier air generated by discharging stored water filled in a combustion gas or carrier air storage tank. After the drying process, temperature in the combustion tube is increased, and the dried organic carbon is burned. Combustion gas is guided to the combustion gas storage tank. An inside of the combustion tube is purified due to high pressure steam generated by injecting pure water and organic carbon removed in the purification process is burned and oxidized. The generated combustion gas is guided to the combustion gas storage tank and is pushed into an infrared meter to measure a carbon dioxide gas concentration. Otherwise, the generated combustion gas is guided to the infrared meter to measure the carbon dioxide gas concentration.

Measurement arrangement for determining a constituent substance or quality parameter of water by thermal decomposition in a reaction module, delivery of the reaction product to a detector in a carrier gas flow, and evaluation of a detector signal for deriving a value of the constituent substance or quality parameter, wherein the reaction module is a vessel of vertical orientation during operation having an internal resistance heating or infrared heating, and has a head section into which the sample is introduced, a reaction zone, where the thermal decomposition is performed, as well as a foot section, from which the reaction product is output in the carrier gas flow, wherein the head section of the reaction module has an injection port for temporarily introducing an injection needle or permanently supporting a small supply tube, which injection port comprises an O-ring which is internally spring-loaded by a silicon padding or an inserted spring.

Measurement arrangement for determining a constituent substance or quality parameter of water by thermal decomposition in a reaction module, delivery of a reaction product to a detector, and evaluation of a detector signal for deriving a value of the constituent substance or quality parameter, wherein the reaction module is an elongated vessel having internal heating, and has a head section into which the sample is introduced, a reaction zone, as well as a foot section, from which the reaction product is output, wherein the reaction module, the heating, and means for the supply of samples and carrier gas are configured such that during the operation of the measurement arrangement an outer head temperature is T.sub.H80 C., and an outer foot temperature is T.sub.F150 C. at a maximum temperature in the reaction zone of T.sub.MAX1150 C.

Provided are low flow groundwater fluid sampling systems and related methods of collecting fluid samples, including a low flow pump, flow cell, waste container and a communication device in communication with those components. In this manner, the low flow pump may be controlled to ensure a desired constant flow-rate is achieved, and a remote operator may monitor the status of fluid being pumped to the flow cell with the communication device, such as with a portable electronic device, including a smart phone. The system may alert the operator that fluid is ready to be collected for sampling, including at an off-site laboratory. Particularly useful applications are for monitoring groundwater quality and contamination.

A water quality analyzer includes a combustion tube (2) for burning a liquid sample inside, a sample injector (6; 8) that executes sample injection operation into the combustion tube (2), a pressure sensor (28) that detects pressure inside the combustion tube (2), a temperature sensor (38) that detects a temperature of the combustion tube (2), and a determination part (46) configured to determine whether the combustion tube (2) and/or the sample injector (6; 8) is normal or abnormal based on an output of the pressure sensor (28) and an output of the temperature sensor (38) immediately after the sample injection operation by the sample injector (6; 8) is executed.

The invention relates to an electrochemical method for determining the DOC and/or TOC and/or IC content in a water sample by means of anodic oxidation on electrodes in a closed electrolysis cell, wherein the carbon is oxidized at least partially to carbon dioxide (CO.sub.2). The carbon dioxide thereby formed is collected in a closed gas space, wherein, in the range of the essentially linear increase in the CO.sub.2 content in the gas space, the rate at which this increase takes place is determined and used in an analyzer unit to determine the DOC and/or TOC and/or IC content.

A water quality analysis instrument for performing a blowback operation and a non-volatile total organic carbon analysis operation in sequence. When the blowback operation is performed, a previous residual gas within a water sample analyzer is discharged. When the non-volatile total organic carbon analysis operation is performed, the water sample flows between an accommodating space and an UV light providing module in a circulating manner, so that the non-volatile total organic carbon in the water sample is nearly completely oxidized, so that the water sample analyzer can analyze a content of non-volatile total organic carbon in the water sample accurately.