This test method is a standardized analytical procedure for the quantitative determination of minerals in water samples using Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES). The method is widely employed for monitoring metal contaminants in drinking water, surface water, groundwater, and wastewater. This test method quantifies calcium, copper, iron, magnesium, manganese, phosphorus, phosphorus (as P2O5), potassium, potassium (as K2O), sodium, sulfur, and zinc.