2,3,3',4-Tetrachlorobiphenyl is primarily used in research and environmental studies due to its classification as a polychlorinated biphenyl (PCB). It serves as a reference compound in analytical chemistry for identifying and quantifying PCB contamination in various environmental samples, such as soil, water, and air. Its presence is monitored to assess the extent of pollution and the effectiveness of remediation efforts. Additionally, it is studied for its toxicological and environmental impact, helping to understand the behavior and risks of PCBs in ecosystems and their potential effects on human health. This compound is also used in laboratory settings to develop and validate methods for detecting and analyzing PCBs in complex matrices.