Determination of urea in swimming pool water by flow injection analyzer

Objective To establish a flow injection method for determining urea in swimming pool water.

Methods The experimental conditions were optimized, and an experimental study was conducted for the method in terms of measuring range, precision, accuracy, and interference factors.

Results The flow injection method showed good linearity within the range of 0.05-5.00 mg/L by determination of urea in swimming pool water, with a correlation coefficient of 0.999 9. The quantification limit of the method was 0.020 mg/L, with relative standard deviation of 0.1%-0.6%, and recovery rate of 95.4%-102.2%.

Conclusion This method has the features of automatic sampling, automatic heating, automatic colorimetry, high sensitivity, short operation time, and accurate quantification. It is suitable for the determination and screening of urea in a large number of swimming pool water samples, which provides an alternative method for the revision of the Examination Method for Public Places (GB/T 18204.2-2014).