Development of the reference material of the multicomponent solution of elements ICP-RM Multi 2 for inductively coupled plasma methods
摘要
Providing metrological assurance of inductively coupled plasma mass spectrometry and optical emission spectrometry is a critical task. The results of measuring mass fractions and mass concentrations of substance components using these methods directly depend on the accuracy of establishing the output signal calibration curve. The latter links the measured signal from the spectrometer to the concentration of the analyzed component. To construct accurate calibration curves, high-quality standard reference materials with highly stable and precise certified characteristics are required. A standard reference material for a multicomponent solution of elements (ICP-RM Multi 2) has been developed, which represents a solution containing the following ten components: barium, cadmium, cobalt, copper, iron, lead, lithium, manganese, nickel, and zinc in diluted nitric acid. Based on the results of measurements conducted using the State Primary Standard of units of mass fraction and mass (molar) concentration of inorganic components in aqueous solutions based on gravimetric and spectral methods (GET 217-2018), key metrological characteristics of the standard reference material have been determined, including long-term stability, homogeneity, and uncertainty of the certified value characterization. The obtained expanded uncertainty of the certified values of mass fraction and mass concentration of the standard reference material components does not exceed 0.8%, which corresponds to the category of working standards according to the state verification schedule for measuring instruments used to determine the content of inorganic components in aqueous solutions. The ICP-RM Multi 2 material is packaged in 30, 60, and 125 cm3 jars made from durable, chemically resistant high-density polyethylene. Each jar is provided with a hermetically sealed screw lid to reliably protect the contents from ambient exposure. The created standard reference material ensures the metrological traceability of the measurement results to GET 217-2018 when performing inorganic analysis using inductively coupled plasma optical emission spectrometry and mass spectrometry.