Vessels for TDS Testing Reduce Prep Time

TDS testing
StableWeigh™ vessels, from Environmental Express, reduce hours of preparation time.

What is TS and TDS testing?

Once water has been treated, it is subjected to various chemical and physical tests to ensure that it meets requirements for further use. One requirement is that the water is free from harmful pollutants, while others deal with the aesthetic water quality. The amount of TS and TDS present in a sample greatly affects the overall palatability of the water and its suitability for use in washing.

Total solids (TS) are the materials left in a vessel or crucible after a sample is evaporated at a defined temperature. Total dissolved solids (TDS) are the portion of the total solids that pass through a 2.0-μm (or smaller) nominal pore-size filter. For TS, the liquid sample is evaporated at a temperature of 104°C; for TDS, the filtrate is first evaporated and the evaporating dish is then transferred to a 180°C oven for at least one hour. In both analyses, the evaporating dish is cooled in a desiccator to the temperature of the balance and is then weighed. These heating, cooling and weighing steps are repeated until a constant weight of ±0.5 mg is achieved. The difference between the post- and pre-weight is the mass of TS or TDS for the sample.

How vessels can save you hours in the lab

StableWeigh™ vessels reduce time spent preparing, weighing, cooling, and cleaning evaporation vessels. Each StableWeigh vessel is preweighed with the tare weight printed on it, so it’s ready to use right out of the box. The vessels are inert to common water and wastewater components, and heat resistant at the temperature required by the method. The vessels do not hold as much heat energy and will cool much faster. Because StableWeigh vessels weigh much less than a traditional glass or ceramic crucible, they give results with greater precision and accuracy. Combined, these factors reduce the number of drying and weighing cycles needed to obtain a constant weight. Once the analysis is complete, the StableWeigh vessels can be disposed of which eliminates the need for washing and the possibility of carryover contamination from one sample to the next.

Learn more by reading the article New TS and Test TDS Method Saves Hours of Manual Labor at wcponline.com

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