Multi-element, Thin Film Metal Standards for Corrosion Product Sample XRF Analysis
Combinations of elements, covering specified mass loading ranges, are deposited on filter surfaces and/or trapped in ion-exchange membranes. The quantity of each element on a standard is NIST traceable.
Filters: Waterborne metal particles are quantitatively deposited on 0.45 membrane filters in a controlled process simulating the method used in power plants to collect actual corrosion product samples. The water stream is forced through a flow cell containing the membrane filter. The pressure and flow rate are adjusted to produce turbulent flow to ensure a uniform deposition of particles on the filter surface. The pH is controlled to maintain the metals in their insoluble form.
Ion-exchange Membranes: Metals dissolved in water are quantitatively bound to active sites on ion-exchange membranes. The pH is controlled to maintain soluble (ionic) conditions.
Filter standards are prepared in a manner that simulates the way corrosion products are collected in power plants. Filtered corrosion products are often held only loosely on the filter surface. A proprietary method used at Detora Analytical makes the deposit more adherent resulting in long-lasting, stable standards.
Set of 5 standards containing a combination of two elements (most commonly, iron and copper)