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Measurement of ion concentration in presence of organics

A technology for metal ion concentration and organic compounds, which can be used in measuring devices, immunoassays, biomaterial analysis, etc., and can solve problems such as mass transfer contribution and resistance drop

Inactive Publication Date: 2017-08-29
CALERA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most electrochemical analyzes focus on low concentrations of analytes, usually in the nM range, due to many problems at M-level concentrations such as mass transfer contributions from migration and large resistance drops

Method used

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  • Measurement of ion concentration in presence of organics
  • Measurement of ion concentration in presence of organics
  • Measurement of ion concentration in presence of organics

Examples

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example

[0206] Table 1

[0207]

[0208]

[0209] Table 2 below illustrates some examples of standard reduction potentials for some metals:

[0210] Table 2

[0211]

[0212]

[0213]

[0214] Any of the oxidation or reduction potentials listed in Tables 1 and 2 above may be considered in determining the voltage range for potential cycling to measure the concentration of a particular metal ion.

[0215] In some embodiments of the methods and systems provided herein, the metal ion is copper, or the metal ion is a metal ion of a metal halide, such as copper halide or copper chloride. In some embodiments, the one or more organic compounds include chlorohydrin and / or EDC.

[0216] In some embodiments, cleaning the UME surface to avoid deposition of one or more organic compounds by passing a gas over the UME surface comprises hydrogen sparging, oxygen sparging, or chlorine sparging on the UME surface. This method can be used in conjunction with the application of potentia...

Embodiment 1

[0265] Application of two sets of potential cycles for measuring metal ion concentrations in the presence of organic matter

[0266] In this experiment, a three-electrode system was employed, comprising a 25 μm platinum microelectrode (eg from CH Instruments), an Ag|AgCl reference electrode and a salt bridge (eg from Gamry), and a platinum wire. The lower half of the UME cell is immersed in a water bath at a temperature of approximately 90 °C. The flow of copper is controlled by a peristaltic pump. In some experiments, flow through the UME cell was controlled by opening and closing valves on either side of the UME cell.

[0267] For the first set of potential cycles, the potential applied to the electrodes was swept from 0.45 V to 2 V at 0.5 V / s for 10 cycles. from Cu(I)Cl reduction potential and O 2 / Cl 2 The precipitation potential determines the potential window. Below 0.45 V, Cu(I) can be reduced to metallic copper and deposited on the UME surface, which is avoided. ...

Embodiment 2

[0270] Application of Potential Cycling for Measuring Metal Ion Concentration in the Presence of Organic Matter

[0271] Pre-adsorption with polystyrene beads: In a laboratory setting, 100 g of polystyrene beads were added to 500 ml of copper solution (5M CuCl 2 , 1M CuCl and 2.5M NaCl). After 15 minutes, the beads were filtered off and fresh beads (100 g) were added to the solution. After 3 times, the CE level in the solution dropped to 20ppm or less (as measured by gas chromatography), as Figure 3A shown in . The copper solution was then run through a UME cell, and compared to the constant decay without adsorption with polystyrene beads, the copper(I) concentration (as currently measured) was found to be stable, as Figure 3B shown in .

[0272] Electrode Surface Treatment by Gas Evolution: In a laboratory setting, a copper solution (4.5M CuCl 2 , 1M or 0.8M CuCl and 2.5M NaCl) flowed through the UME cell at about 300 l / h. During the flow state, UME was scanned be...

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Abstract

Disclosed herein are systems and methods that relate to use of ultramicroelectrodes (UME) in measurement of ion concentration in presence of one or more organic compound(s).

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Patent Application No. 62 / 077,810, filed November 10, 2014; the entire disclosure of which is hereby incorporated by reference. [0003] governmental support [0004] The work described herein was completed in whole or in part with government support under grant number DE-FE0002474 awarded by the Department of Energy. The government has certain rights in this invention. Background technique [0005] In many industrial processes, real-time on-line measurement of the concentrations of reactants and products of interest may be necessary for process control. A variety of analytical methods including liquid or gas chromatography, mass spectrometry, spectrophotometry, and electrochemical methods have been used. Electrochemical methods may be convenient because they are available online and are relatively inexpensive. However, most electrochemical analyzes focus on lo...

Claims

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Application Information

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IPC IPC(8): G01N27/28
CPCG01N27/38G01N27/401G01N27/49G01N33/1813Y10T436/255
Inventor R·J·吉利亚姆赵宏
Owner CALERA CORP
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