Total Dissolved Solids (TDS) is commonly used for assessing the concentration of impurities in water in areas such as environmental monitoring and boiler and cooling tower water monitoring. There are 2 main methods for testing TDS:
Contents of the Guide
| 1. | Take an accurately measured volume of the sample, filter it to remove suspended solids and then evaporate off the water at 180°C for 1 hour. The evaporating dish is weighed before and after the test and the increase in weight is the TDS. |
| 2. | Using an electronic TDS meter. Strictly speaking, these meters do not measure TDS; instead they measure the sample’s conductivity and use a correlation to report a TDS value in ppm (ppm is the same as mg/l). |