Optical Detection of Dissolved Solids in Water Samples

This work investigates the use of optical methods for the detection of dissolved solids in water. In this spectrophotometry, we used high-intensity Xenon light within the wavelength range of 640-1010 nm, to measure the transmittance of water samples. Several water samples of groundwater and medical wastewater collected from different locations under different set of conditions have been used. For all the tested samples, the transmittance was measured and the relations between the parameters such as salinity, pH and total dissolved solids (T.D.S.) concentration were developed. By considering the average of digital counts by the spectrophotometer, the concentration of dissolved solids in water samples is evaluated and the quantitative analysis is done based on the transmittance of the samples in the near infrared region.