Herbicides contribute to arsenic desorption through mobilisation and transportation of the contaminant. In high concentrations, selenium acts as an environmental contaminant. Deep microbial life is only a contaminant of primordial hydrocarbons. Additionally, the property contains a pond that is polluted with arsenic, a common agricultural contaminant. Radon is a contaminant that affects indoor air quality worldwide. The fume hoods serve to evacuate hazardous levels of contaminant. Coal contains mercury as a natural contaminant. The retardation factor depends on the chemical nature of both the contaminant and the aquifer. Thiophene was discovered as a contaminant in benzene. Aflatoxin B1, a frequent food contaminant, causes liver cancer. Vinyl chloride is a common contaminant found near landfills. Sulfuric acid hydrate is another possible explanation for the contaminant observed spectroscopically. One application is to use cells to determine herbicides which are main aquatic contaminant. One alleged potential contaminant is tricresyl phosphate. Sulfur (S) is a frequent contaminant in coal.