Abstract: A method for detecting for the presence of H2S or HS? anion in a system, comprising contacting a sample from the system with a compound, or a protonate or salt thereof, having a structure represented by: wherein Y represents an aromatic group or a substituted aromatic group; n is 1 or 2; R is independently H, alkyl, substituted alkyl, a polyether moiety, carboxyl, substituted carboxyl, carbamate, substituted carbonate, carbonyloxy, alkoxy, substituted alkoxy, haloalkyl, halogen, nitro, amino, amido, aryloxy, cyano, hydroxyl, or sulfonyl; R1 is H, substituted lower alkyl, lower alkyl, substituted aralkyl or aralkyl; R2 is selected from H, acyl, substituted aralkyl, aralkyl, phosphonyl, —SO2R3; —C(O)R5; —C(O)OR7 or —C(O)NR9R10; R3; R5; R7; R9 and R10 are each independently selected from H, substituted lower alkyl, lower alkyl, substituted aralkyl, aralkyl, substituted aryl or aryl.

Abstract: A method for detecting for the presence of H2S or HS? anion in a system, comprising contacting a sample from the system with a compound, or a protonate or salt thereof, having a structure represented by: wherein Y represents an aromatic group or a substituted aromatic group; n is 1 or 2; R is independently H, alkyl, substituted alkyl, a polyether moiety, carboxyl, substituted carboxyl, carbamate, substituted carbonate, carbonyloxy, alkoxy, substituted alkoxy, haloalkyl, halogen, nitro, amino, amido, aryloxy, cyano, hydroxyl, or sulfonyl; R1 is H, substituted lower alkyl, lower alkyl, substituted aralkyl or aralkyl; R2 is selected from H, acyl, substituted aralkyl, aralkyl, phosphonyl, —SO2R3; —C(O)R5; —C(O)OR7 or —C(O)NR9R10; R3; R5; R7; R9 and R10 are each independently selected from H, substituted lower alkyl, lower alkyl, substituted aralkyl, aralkyl, substituted aryl or aryl.

Abstract: Embodiments of the inventive concept include a portable ion concentration apparatus including a controller, a storage section to store one or more data samples, an amplifier circuit, and a chemical field effect transistor (CHEMFET). The CHEMFET and the amplifier circuit can indicate a quantity of nitrate levels in a sample media or a reference media. The controller can process the indication of the quantity of nitrate levels, and generate the one or more data samples based at least on the indication of the quantity of nitrate levels. The portable ion concentration apparatus can include an in-field analysis apparatus, an in-field measurement apparatus, or an in-soil monitoring apparatus. A measurement logic section can determine an ion concentration based on a sensitivity slope M or a polynomial fit. Also disclosed is a method for measuring ion concentration with a standard deviation correction.

Abstract: Embodiments of the inventive concept include a portable ion concentration apparatus including a controller, a storage section to store one or more data samples, an amplifier circuit, and a chemical field effect transistor (CHEMFET). The CHEMFET and the amplifier circuit can indicate a quantity of nitrate levels in a sample media or a reference media. The controller can process the indication of the quantity of nitrate levels, and generate the one or more data samples based at least on the indication of the quantity of nitrate levels. The portable ion concentration apparatus can include an in-field analysis apparatus, an in-field measurement apparatus, or an in-soil monitoring apparatus. A measurement logic section can determine an ion concentration based on a sensitivity slope M or a polynomial fit. Also disclosed is a method for measuring ion concentration with a standard deviation correction.

Abstract: A method for detecting for the presence of H2S or HS? anion in a system, comprising contacting a sample from the system with a compound, or a protonate or salt thereof, having a structure represented by: wherein Y represents an aromatic group or a substituted aromatic group; n is 1 or 2; R is independently H, alkyl, substituted alkyl, a polyether moiety, carboxyl, substituted carboxyl, carbamate, substituted carbonate, carbonyloxy, alkoxy, substituted alkoxy, haloalkyl, halogen, nitro, amino, amido, aryloxy, cyano, hydroxyl, or sulfonyl; R1 is H, substituted lower alkyl, lower alkyl, substituted aralkyl or aralkyl; R2 is selected from H, acyl, substituted aralkyl, aralkyl, phosphonyl, —SO2R3; —C(O)R5; —C(O)OR7 or —C(O)NR9R10; R3; R5; R7; R9 and R10 are each independently selected from H, substituted lower alkyl, lower alkyl, substituted aralkyl, aralkyl, substituted aryl or aryl.

Abstract: Embodiments of the inventive concept include a portable ion concentration apparatus including a controller, a storage section to store one or more data samples, an amplifier circuit, and a chemical field effect transistor (CHEMFET). The CHEMFET and the amplifier circuit can indicate a quantity of nitrate levels in a sample media or a reference media. The controller can process the indication of the quantity of nitrate levels, and generate the one or more data samples based at least on the indication of the quantity of nitrate levels. The portable ion concentration apparatus can include an in-field analysis apparatus, an in-field measurement apparatus, or an in-soil monitoring apparatus. A measurement logic section can determine an ion concentration based on a sensitivity slope M or a polynomial fit. Also disclosed is a method for measuring ion concentration with a standard deviation correction.

Abstract: Sorbent materials include a support, a base material comprising a first compound covalently bound to the support, and an active material reversibly bound to the base material, wherein the active material comprises a second compound with at least one functional group selected for binding a target species. The active material with the bound target species can be removed by washing the sorbent material with a solvent in which the second compound is soluble. The sorbent material can be regenerated by reversibly binding one or more second compounds having a selected functional group to the washed base material.