Refined Protocol for Improving Accuracy and Reliability in Urea Quantification During Electrochemical C─N Coupling...

Area of Science:

• Electrochemistry
• Green Chemistry
• Analytical Chemistry

Background:

• Electrochemical C-N coupling for urea synthesis is gaining traction due to sustainable cycling demands.
• Reliable urea quantification is essential for understanding structure-performance relationships and optimizing urea electrosynthesis.
• Existing quantification methods present significant risks of false positives or negatives.

Purpose of the Study:

• To re-assess common urea quantification techniques: diacetylmonoxime-thiosemicarbazide and urease-based methods.
• To identify and address confounding factors affecting urea quantification accuracy.
• To propose a refined, reliable method for urea quantification in electrosynthesis studies.

Main Methods:

• Re-assessment of diacetylmonoxime-thiosemicarbazide and urease-based urea quantification methods.
• Identification of interference from nitrite, metallic impurities, and standard curve protocols.
• Development of problem-solving strategies including chemical pre-reduction and galvanic replacement.

Main Results:

• Adverse impacts of nitrite, metallic impurities, and standard curve protocols on urea quantification were identified.
• Effective strategies were proposed to mitigate these confounding factors.
• A refined urea quantification protocol was established.

Conclusions:

• The refined urea quantification method enhances the accuracy and reproducibility of urea electrosynthesis studies.
• This improved method will support the advancement of sustainable carbon and nitrogen cycling through urea electrosynthesis.
• Accurate quantification is key to the iterative optimization and sound development of electrochemical urea synthesis.