This mixture of anions—chloride, bromide, nitrate, and sulfate—is commonly encountered in environmental and industrial water systems. Its primary application lies in water quality analysis, where the presence and concentration of these ions help assess contamination sources, salinity, and overall water suitability for drinking, agriculture, or industrial use. In wastewater treatment, monitoring this anion combination aids in detecting pollution from agricultural runoff (nitrates, sulfates), seawater intrusion (chlorides, bromides), or industrial discharges. The mixture is also relevant in corrosion studies, as chloride and sulfate anions are known to promote metal degradation in pipelines and cooling systems. Additionally, in geochemical research, the relative ratios of these anions serve as tracers to understand groundwater flow, rock-water interactions, and sedimentary processes.