An embodiment provides a method for deriving an amount of PFAS substances from a total organic fluoride measurement in a sample, including: removing inorganic fluoride from the sample using one or more of an ion exchange cartridge and an exclusion apparatus; preconcentrating, using a solid phase extraction, at least one PFAS substance in the sample; digesting, using a working electrode and a counter electrode, the at least one PFAS substance to an amount of total organic fluoride; and determining, using an analyzer, the amount of total organic fluoride in the sample. Other aspects are described and claimed.

Provided are nanoparticles for sensing phosphate, a method for manufacturing the same, and a membrane for sensing phosphate including the same. The nanoparticles for sensing phosphate include a coordination polymer in which lanthanide metal ions and ligands are coordinated, and a polymer.

Provided are nanoparticles for sensing phosphate, a method for manufacturing the same, and a membrane for sensing phosphate including the same. The nanoparticles for sensing phosphate include a coordination polymer in which lanthanide metal ions and ligands are coordinated, and a polymer.

A measuring apparatus for determining at least one measurand of a measuring medium includes a first measuring device including a first measuring sensor structured to contact the measuring medium and configured to detect measured values of the at least one measurand, the first measuring device embodied to determine a first measured value that is dependent on the at least one measurand of the measuring medium, a sampling device structured to remove a sample from the measuring medium, a second measuring device including a second measuring sensor and embodied to determine a second measured value that is dependent on the least one measurand of the sample, and an electronic control apparatus configured to receive and process the first and second measured value and to perform a verification, calibration and/or adjustment of the first measuring device using the second measured value.

A measuring apparatus for determining at least one measurand of a measuring medium includes a first measuring device including a first measuring sensor structured to contact the measuring medium and configured to detect measured values of the at least one measurand, the first measuring device embodied to determine a first measured value that is dependent on the at least one measurand of the measuring medium, a sampling device structured to remove a sample from the measuring medium, a second measuring device including a second measuring sensor and embodied to determine a second measured value that is dependent on the least one measurand of the sample, and an electronic control apparatus configured to receive and process the first and second measured value and to perform a verification, calibration and/or adjustment of the first measuring device using the second measured value.

A system and a computer-implemented method of managing building wellness. The method may include the steps of: obtaining wellness parameters for a building (e.g., an office building) having an occupant(s); processing the wellness parameter to determine a current wellness index for the building and, based on the current wellness index, sending a message regarding the current wellness index to a recipient(s) (e.g., a building occupant), displaying the current wellness index for a user(s), and/or identifying a remediation action(s) to improve the current wellness index.

A system and a computer-implemented method of managing building wellness. The method may include the steps of: obtaining wellness parameters for a building (e.g., an office building) having an occupant(s); processing the wellness parameter to determine a current wellness index for the building and, based on the current wellness index, sending a message regarding the current wellness index to a recipient(s) (e.g., a building occupant), displaying the current wellness index for a user(s), and/or identifying a remediation action(s) to improve the current wellness index.

A measuring apparatus for determining the total organic carbon of a sample in a liquid medium includes a reactor block made of a metallic, electrically conductive, and corrosion-resistant material, the reactor block including a housing wall for accommodating a light source, the housing wall including an inlet into and an outlet from the reactor block and a flow chamber in which digestion of the sample for determining the total organic carbon occurs, the flow chamber configured to accommodate the light source and to route the sample to be irradiated with light, wherein the measuring apparatus further includes at least one conductivity measurement device, wherein the reactor block is an external electrode of the conductivity measurement device. A method for determining the total organic carbon of the sample using the measuring apparatus is disclosed.

A method for identifying and analyzing dissolved organic nitrogen of different sources in wastewater includes extracting DON in wastewater to obtain a DON extract, detecting mass spectrum peaks in the DON extract, pre-processing the spectral data of the wastewater sample; constructing a network relationship of the substance reaction in the wastewater sample; screening the substance reaction relationship of DON; and determining different sources of DON.

Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, that generate from a first pair and a second pair of images of livestock that are within an enclosure and that are taken at different times using a stereoscopic camera, at least two distance distributions of the aquatic livestock within the enclosure. The distance distributions can be used to determine a measure associated with an optical property of the water within the enclosure. A signal associated with the measure can be provided.