Chlorine dioxide (ClO 2) is a gas that can be used for water disinfection. To date, only uncut and unpeeled produce can be contacted with ClO 2. Chlorine dioxide has been given a USDA 3-D approval for washing fruits and vegetables to be used as ingredients of meat and poultry products.he chemicals that make up chlorine dioxide can also be easily identified by the user. Sodium chlorite is a white crystalline powder. One of its physical characteristics is its ability to absorb moisture. The other component of chlorine dioxide, hydrochloric acid, is a colorless liquid.
The validity of a test refers to whether the test measures what it is supposed to measure. The three most common types of validity are face validity, empirical validity, and construct validity. We consider these types of validity below.
Face validity refers to the degree to which an assessment or test subjectively appears to measure the variable or construct that it is supposed to measure. In other words, face validity is when an assessment or test appears to do what it claims to do.