Matrix

Matrix – This refers to the environment the analytes of interest are preserved in – this is commonly dilute acid (a small amount of acid combined with water) or base, depending on the analytes’ stability needs. A large portion of our products will be stored in a nitric acid matrix. Other popular matrix acids include hydrochloric, hydrofluoric, and sulfuric acid. Popular bases are ammonium hydroxide (NH₄OH), sodium hydroxide (NaOH), and triethanolamine (TEA).

• Depending on the industry and samples being analyzed the matrix may also include elements, salts, etc. that are present in high concentrations. For example, brine samples needing to be tested for heavy metals may be identified as having a matrix of concentrated NaCl.