testingmethodsop

Total Dissolved Solids (TDS) testing for wastewater is a critical procedure outlined in the Standard Methods for the Examination of Water and Wastewater by the American Public Health Association (APHA). Specifically, the method referenced is APHA Standard Method 2540C: Total Dissolved Solids Dried at 180°C. Below is a detailed Standard Operating Procedure (SOP) for preparing and conducting TDS testing in wastewater, including a description of the method and a flow chart to illustrate the process. Standard Operating Procedure (SOP) for TDS Testing in Wastewater (APHA Method 2540C) 1. Purpose To determine the concentration of total dissolved solids (TDS) in wastewater samples using the gravimetric method as specified in APHA Standard Method 2540C. TDS measures the mass of organic and inorganic substances dissolved in water that pass through a filter, typically after evaporation at 180°C. 2. Scope This SOP applies to the analysis of wastewater samples (industrial, municipal, or environmen...