Feature Article: Simple and Quick Quality Confirmation Method of Aqueous Urea Solution for Marine SCR System

By: Keiko KUWAMOTO*

2 August 2019


Figure 3 Aqueous urea solution test kit

Author(*) Information: HORIBA Advanced Techno, Co., Ltd.
The quality requirements of aqueous urea solution at 40% concentration for Marine Selective Catalytic Reduction (SCR) system is defined by International Standard (ISO-18611). One of them is the alkalinity which determined by potentiometric titration of free ammonia in the urea solution with hydrochloric acid solution. However, the titration is time-consuming work, and there are no crew being familiar with the chemical experiment, and no operation place in the ship. This paper shows compact water quality meter LAQUAtwin pH can be used for the simple and quick evaluation of aqueous urea solution quality.

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