Ultrapure Water: A Reference Reagent for the Analysis of Trace Environmental Toxic Elements

Toxic elements such as beryllium (Be), chromium (Cr), mercury (Hg), and lead (Pb) can cause long-term harm to the environment and human health. Given the detection limits of ICP-MS, any contamination from reagents, containers, or cleaning steps will directly raise the background equivalent concentration, becoming the dominant error factor. Therefore, ultrapure water is not only a solvent but also a benchmark reagent that determines the reliability of the data.

Three Major Functions of Ultrapure Water in Trace Analysis

• Blank reference: Used to prepare method blanks and calibration blanks to ensure that the signal response is entirely derived from the analyte.

• Dilution and extraction: Samples, standard stock solutions and internal standards must be diluted with ultrapure water to avoid introducing exogenous ions.

• Cleaning and rinsing: The sample introduction system, nebulizer, autosampler tubing and containers need to be rinsed repeatedly with ultrapure water to reduce memory effect and cross-contamination.

Key Parameters and Requirements

In the analysis of trace toxic elements, ultrapure water has been upgraded from an "auxiliary reagent" to a "critical quality control point." The UPP purification system, through multi-stage purification, provides a reliable blank baseline for ICP-MS, ensuring that environmental laboratories obtain accurate, comparable, and traceable data.