Chunze Lai, Ph.D. Introduction: A novel highly selective sensor for silver is described below. This sensor is based on Teflon®like matrixes and a new fluorophilic silver receptors. Background: Silver is utilized for a wide range of applications. Due to their antibacterial properties, silver salts and silver nanoparticles are used for the disinfection of drinking water and the preparation of topical gels, specialty bandages, implantable prostheses, and catheters. Every year, about 2500 tons of silver are released into the environment and approximately [...]
Li Chen, Ph. D. Introduction: We developed potentiometric cyanide (CN–) sensors based on receptor-doped polymeric membranes, as described below. This sensor can be applied to erform on-line CN– monitoring in mining industry for controlling of cyanide leaching and detoxification processes. Background: The high toxicity of cyanide and environmental concerns from its widely and continuously industrial use arouse interests in selective and sensitive methods for cyanide detection in various matrices, such as drinking water, surface water and biological fluids. To date, cyanide [...]
CarbonX for QuEChERS A short video demonstrating the use of United Science’s new product, CarbonX for QuEChERS, and its ability to remove pigments. The method being used here is the AOAC 2007.1 Pigmented method. Spinach is a difficult matrix to deal with, but with CarbonX for QuEChERS you can remove the pigment you don’t want without removing the pesticides you do.
in situ Carbonate/Bicarbonate/Carbon Dioxide Monitoring with Teflon® like Carbonate-Selective and pH SensorsUnited Science
Li Chen, Ph. D. Introduction: A novel highly selective sensor for carbonate (CO32-) is described below. This sensor is based on Teflon®like matrixes and a new fluorophilic carbonate receptors. In conjugation with Teflon®like pH sensors, this sensor system can provide in situ monitoring of Carbonate (CO32-) /Bicarbonate (HCO3–) /Carbon Dioxide (CO2). Background: A need for accurate and rapid determination of total carbon dioxide (i.e., carbon dioxide, bicarbonate and carbonate) arises from clinical chemistry, environmental analysis and industry. Polymeric membrane electrodes with [...]
Chunze Lai, Ph.D. Introduction: Our fluorous PFC sensors aim at monitoring perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS) with no cost, at low concentration and in-situ. Background: PFOA and PFOS are ubiquitous environmental contaminants that have been found at low concentrations in waste water, drinking water, human blood, and in food. Because PFOA, PFOS and other perfluorochemicals (PFCs) are bio-accumulative, extremely persistent and toxic, several states have established analytical methods and emission limits. Furthermore, there is a huge effort surrounding remediation [...]