<Table> <Tr> <Td> </Td> <Td> This article needs attention from an expert on the subject . Please add a reason or a talk parameter to this template to explain the issue with the article . When placing this tag, consider associating this request with a WikiProject . (September 2012) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs attention from an expert on the subject . Please add a reason or a talk parameter to this template to explain the issue with the article . When placing this tag, consider associating this request with a WikiProject . (September 2012) </Td> </Tr> <P> A blank solution is a solution containing little to no analyte of interest, usually used to calibrate instruments such as a colorimeter . According to the EPA, the "primary purpose of blanks is to trace sources of artificially introduced contamination ." Different types of blanks are used to identify the source of contamination in the sample . The types of blanks include equipment blank, field blank, trip blank, method blank, and instrument blank . </P>

What is the purpose of a blank solution in colorimetric analysis