Modernized sensor measurement technique for determination of chlorine in bathing water

Colorimetric fiber optic sensor was developed for determination of total and residual chlorine in water. Developed sensor is based on absorption and detects values in the red, green, blue color space which is converted in user-oriented hue, saturation, value color model. Hue, saturation, value color model is enforced to simplify determination of the key chemical parameters concentration in water. Concentrations of total and residual chlorine in swimming pool water samples were measured by standard chemical laboratory analysis and compared with concentrations obtained by sensor, to approve the repeatability and effectiveness of the innovative method for measurements in water. In addition, results obtained by analysis of surface water and swimming pool water were compared in order to prove effectiveness of sensor for different water media. The absolute value between the two compared methods for the total chlorine concentrations was in the range from 0.014 to 0.067 mg/L and for residual chlorine from 0.002 to 0.06 mg/L. The linearity of calibration curve, limit of detection and quantitation, accuracy and precision are investigated to prove the validation of the analytical procedure to determine chlorine species by sensor. Used sensor method with its advantages (efficiency, low cost, simple use, small size, repeatability) was used on laboratory scale for the first time separately for total chlorine and residual chlorine and demonstrates possibility to replace expensive standard analytical laboratory equipment.