Safe Drinking Water Act Latino and African American populations are at higher risk of exposure to drinking water contaminants. Contaminants found in the drinking water of such communities include nitrates, coliform, and lead, which have been linked to cancer, reproductive health problems, gastrointestinal illness, and other health problems. One study found that levels of contaminants in the drinking water of two Nebraska Native American reservations were significantly higher than regional contaminant levels. Another study found that Latino residents in Tucson, Arizona, had higher than average levels of contaminants in their drinking water, which were linked to higher rates of cancer and neurological disorders among
Quantum yield Quantum yield The quantum yield (Φ) of a radiation-induced process is the number of times a specific event occurs per photon absorbed by the system. The "event" is typically a kind of chemical reaction. The quantum yield for the decomposition of a reactant molecule in a decomposition reaction is defined as: Quantum yield can also be defined for other events, such as fluorescence: Here, quantum yield is the emission efficiency of a given fluorophore. Quantum yield is used in modeling photosynthesis: In a chemical photodegradation process, when a molecule dissociates after absorbing a light quantum, the quantum yield is the