The present invention relates to a method and a device for the chemical-free determination of the chemical oxygen demand (CODs) in aqueous samples. The object of the invention, to develop a method that compensates for the disadvantages of the standard method and at the same time is at least as good as this, in that it can determine the COD quickly and with a high measurement frequency without chemicals and is cheap and has a low personnel requirement and should be simple to automate, is achieved in that the chemical oxygen demand of aqueous samples is determined by non-specific oxidation of water components at an electrode (11), assisted by (ultra)sound from a sound source (15) in a frequency range in which no significant quantities of oxidative species are formed, i.e. below the cavitation threshold.

An organic light emitting display device includes a plurality of pixels. Each of the pixels includes an organic light emitting diode, first to third transistors, a storage capacitor, and a first capacitor. The second transistor includes a gate electrode receiving a first scan signal, a first electrode receiving a data signal, and a second electrode connected to a first electrode of the first transistor. The third transistor includes a gate electrode receiving a second scan signal, a first electrode connected to a second electrode of the first transistor, and a second electrode connected to a gate electrode of the first transistor. The storage capacitor includes a first electrode receiving a power voltage and a second electrode connected to the gate electrode of the first transistor. The first capacitor includes a first electrode connected to the gate electrode of the third transistor and a second electrode receiving the power voltage.

A method is provided for determining analyte concentrations, for example glucose concentrations, that utilizes a dynamic determination of the appropriate time for making a glucose measurement, for example when a current versus time curve substantially conforms to a Cottrell decay, or when the current is established in a plateau region. Dynamic determination of the time to take the measurement allows each strip to operate in the shortest appropriate time frame, thereby avoiding using an average measurement time that may be longer than necessary for some strips and too short for others.

The present disclosure relates to a method for producing an exchangeable electrode assembly, with at least one sensor body and at least a first electrode, for an electrochemical sensor for determining the concentration of an analyte in a gaseous or liquid measurement medium, a corresponding electrode assembly, and an electrochemical sensor with an electrode assembly according to the present disclosure. In order to produce the electrode assembly, the following method steps are performed: providing a sensor body, and applying at least a first electrically-conductive material to a first sub-region of the sensor body for producing a first electrode of the electrode assembly.

Some embodiments are directed to a portable electronic device for analyzing an analyte. The portable electronic device includes a housing, an adapter detachably coupled to the housing and a processor disposed in the housing. The adapter includes a body defining an opening for receiving a test strip and an interface port disposed within the body. The interface port is configured to read a signal from the test strip. The processor is communicably coupled to the interface port. The processor is configured to determine at least one parameter of the analyte based on the signal received from the interface port.

A filter contamination measuring device includes: a working electrode adjacent to a first surface of a filter, the filter configured to adsorb an ionic material of a first polarity, a counter electrode disposed on the other surface of the filter, a potentiostat configured to apply a voltage of a second polarity to the working electrode for a predetermined period of time, and to measure current output from the working electrode. The potentiostat is configured to increase the voltage over the predetermined amount of time. The filter contamination measuring device further includes a controller configured to calculate a maximum current attained during the predetermined amount of time and a corresponding voltage value, and to determine the type and concentration of the ionic material based on the maximum current and the voltage value.

One or more computer processors obtain one or more time-dependent signals with one or more sensor pairs in a sensing system, respectively, wherein each of the one or more time-dependent signals are obtained as a differential signal of a respective pair of the one or more sensor pairs by successively sensing a reference liquid and each liquid in a set of liquids to be characterized with the respective pair; extracting one or more sets of features from one or more portions of the one or more time-dependent signals, respectively, each of the one or more portions including a signal portion obtained while sensing each liquid in the set of liquids with said respective pair; and characterize each liquid in the set of liquids based on the one or more extracted sets of features.

The present disclosure provides a method for distinguishing potassium chlorate from potassium bromate, including the following steps: using a “HCHO—NaHSO.sub.3—Na.sub.2SO.sub.3” pH clock system as a distinguishing solution, and distinguishing the potassium chlorate and the potassium bromate according to different responses, namely different induction times, of the pH clock system, caused by the potassium chlorate and the potassium bromate, respectively. In the present disclosure, the pH clock system provided by the distinguishing method has an intuitive graph, and can easily and quickly distinguish the potassium chlorate and the potassium bromate; meanwhile, the distinguishing method has simple equipment, a high accuracy, and easy operation and observation.

A liquid sampling device for use with a mobile device comprises a wired connection for connecting the liquid sampling device to the mobile device, a sample receiving and testing section capable of receiving a liquid sample and conducting electrochemical testing of the liquid sample and a sample testing circuit configured to communicate at least one liquid sample test result to the mobile device via the wired connection. Associated methods and a mobile device application for interfacing with the liquid sampling device are also disclosed.

Disclosed herein is a sensor for measuring perfluoroalkyl acids and/or polyfluoroalkyl acids. The sensor includes a working electrode, a counter electrode and optionally a reference electrode. The working electrode includes a film disposed on the surface of the working electrode and the film includes a perfluorinated anion exchange ionomer. A method of using the sensor to detect perfluoroalkyl acids and/or polyfluoroalkyl acids is also described.