One-Component Solid Reagent for Ammonium Ion Detection

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Solution Overview

Problem

Conventional methods for determining ammonium ions in aqueous solutions using the Berthelot reaction require multiple reagents, leading to increased work and material expenses, and are susceptible to interference from chlorine donors, resulting in inaccurate measurements due to undermays.

Innovation Solution

A one-component solid reagent comprising a catalyst, a strong base with a specific pKa value, a hypohalite source, and a phenol compound, which is non-hygroscopic and resistant to hypohalite, allowing for a simplified and stable detection process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If multiple reagents are used for the Berthelot reaction, then the detection sensitivity and selectivity are improved, but the complexity of the procedure and material requirements increase

Engineering Contradiction:

Improvedetection sensitivityVSAvoidprocedure complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent combines all necessary reagents (phenol derivative, catalyst, buffer substance, and hypohalite source) into a single solid reagent composition. This merging eliminates the need for multiple separate reagent bottles and stepwise addition procedures, while maintaining the complete Berthelot reaction capability for sensitive and selective ammonium ion detection.

Inventive Principle:

Principle #5Merging (Combining)

2Measurement precision

If multiple reagents are used for the Berthelot reaction, then the detection sensitivity and selectivity are improved, but the material effort and cost increase

Engineering Contradiction:

Improvedetection sensitivityVSAvoidmaterial effort

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

Inventive Principle:

Principle #5Merging (Combining)

3Ease of operation

If conventional reagents are used, then the reaction can proceed, but interference from chlorine donors leads to inaccurate measurements

Engineering Contradiction:

Improvereaction feasibilityVSAvoidmeasurement accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent incorporates the hypohalite source directly into the solid reagent composition alongside the phenol derivative and catalyst. This integration ensures that hypohalite is generated in situ at the correct timing and location, converting the potential harmful interference from external chlorine donors into a controlled beneficial effect where the reagent itself provides the necessary oxidizing conditions without susceptibility to external interference.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

4Device complexity

If a one-component solid reagent is used, then the procedure is simplified and material effort is reduced, but the stability and resistance to hypohalite may be compromised

Engineering Contradiction:

Improveprocedure simplicityVSAvoidreagent stability

Core Design Contradiction:

Device complexityVSStability of the object's composition

Solution Approach 1:

The patent creates a composite solid reagent material comprising a phenol derivative, catalyst, buffer substance, and hypohalite source in specific combinations. This composite structure provides mutual protection and stability - the buffer substances maintain appropriate pH conditions, the matrix materials protect sensitive components, and the overall composition remains stable while resistant to premature hypohalite decomposition, enabling simplified one-component usage without sacrificing stability.

Inventive Principle:

Principle #40Composite materials

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

The one-component system provides a quick, uncomplicated analysis with reduced material effort and maintains detection accuracy over extended storage periods, minimizing interference and ensuring precise measurement results.

Implementation Method 1

The Berthelot reaction, also known as the indophenol reaction, is the name given to the reaction between ammonium ions and a phenol, which under suitable oxidizing conditions leads to the formation of an indophenol dye (which exhibits strong absorption between 630 and 720 nm)

Methodology Applied

Scientific EffectBerthelot reaction:

Implementation Method 2

The generated monochloramine is then reacted with two molecules of a phenol compound (shown below as an example of phenol) using a catalyst (e.g., sodium nitroprusside (NPN)) to form an indophenol dye (oxidative dehydrogenation process)

Methodology Applied

Scientific EffectOxidative dehydrogenation: Oxidation

Implementation Method 3

in the first step, the ammonium ions are deprotonated by increasing the pH value to form ammonia

Methodology Applied

Scientific EffectDeprotonation:

Implementation Method 4

which reacts with the hypohalite (shown below as an example for hypochlorite). in situ The generated monochloramine

Methodology Applied

Scientific EffectHypohalite reaction:

Data Source

PatentEP3954994B1Reagent for detecting ammonium ions in aqueous solution

Publication Date: 2025.04.30 AXAGARIUS

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AI summary

The invention relates to a solid reagent for the determination of ammonium ions in aqueous solution, a method for its preparation, a method for the qualitative detection of ammonium ions in aqueous solution, and a method for the quantitative determination of ammonium ions in aqueous solution using the solid reagent.