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.
Content validity is the estimate of how much a measure represents every single element of a construct. Construct Validity Construct validity defines how well a test or experiment measures up to its claims.