Alkalinity Measurement Interferant Compensation
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Solution Overview
Problem
Existing alkalinity measurement systems in aqueous samples are prone to inaccuracies due to the oxidation of interferants, such as chloride, which contribute to incorrect alkalinity values, as they do not effectively differentiate between water oxidation and interferant oxidation signals.
Innovation Solution
The system applies electrical signals below and above the water oxidation threshold to measure distinct electrical responses, attributing the response below the threshold to interferants and correcting for their charge contribution to accurately determine alkalinity by measuring the difference between these responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional electrochemical methods are used to measure alkalinity, then the measurement process is simplified, but measurement precision deteriorates due to interference from oxidizable substances like chloride
Solution Approach 1:
The patent segments the electrochemical measurement process into two distinct phases: a conditioning phase where interferants are oxidized at lower potentials, and a measurement phase where alkalinity is determined at higher potentials. This segmentation allows the system to separate and eliminate interferant signals from the alkalinity measurement, resolving the contradiction between operational simplicity and measurement precision.
Solution Approach 2:
The patent applies preliminary action by performing a conditioning step before the actual alkalinity measurement. During this preliminary phase, interferants such as chloride are pre-oxidized at lower potentials, removing their interfering effect before the alkalinity measurement begins. This preliminary removal of interferants enables accurate subsequent measurement without compromising operational simplicity.
2Measurement precision
If electrical signals are applied to oxidize interferants, then measurement precision improves by accounting for interferant species, but device complexity increases due to multiple measurement phases
Solution Approach 1:
The patent implements periodic action by applying electrical signals in distinct periodic phases: first a conditioning phase at lower potentials to oxidize interferants, then a measurement phase at higher potentials to determine alkalinity. This periodic application of electrical signals with different characteristics allows the system to achieve high measurement precision while managing device complexity through structured, repeatable measurement cycles.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method allows for precise quantification of alkalinity by accounting for interferant species, providing accurate alkalinity measurements even in the presence of interfering substances, thus overcoming the limitations of traditional electrochemical methods.
Implementation Method 1
identifying, during application of the electrical signal, that the electrical signal reaches an oxidation threshold and measuring, prior to reaching the oxidation threshold, a first electrical response to the electrical signal, the first electrical response attributable to interferants in the aqueous sample
Data Source
AI summary
An embodiment provides a method for compensating for inteferants in measurement of alkalinity in a reagent-less system, including: introducing an aqueous sample into a measurement device comprising one or more series of electrodes; applying an electrical signal to the aqueous sample using the one or more series of electrodes, wherein the electrical signal is selected from the group consisting of: current and voltage; identifying, during application of the electrical signal, that the electrical signal reaches an oxidation threshold and measuring, prior to reaching the oxidation threshold, a first electrical response to the electrical signal, the first electrical response attributable to interferants in the aqueous sample; identifying, during application of the electrical signal, that the electrical signal reaches an endpoint and measuring, from the oxidation threshold to the endpoint, a second electrical response to the electrical signal; and measuring an alkalinity of the aqueous sample based upon a difference between the first electrical response and the second electrical response. Other aspects are described and claimed.