Cation exchange capacity and X-ray diffraction ana

The U.S. Geological Survey (USGS) Central Energy Resources Science Center seeks a qualified commercial laboratory to perform mineralogical analyses on 150 geologic core samples from the Alaska North Slope. The work includes quantitative cation exchange capacity (CEC) measurements and whole‑rock X‑ray diffraction (XRD) with full‑pattern fitting for all samples, plus detailed clay‑type and interstratification analysis on a subset of 30 samples. The vendor must prepare samples, conduct analyses within an 8‑week turnaround per batch, provide raw data files and Excel summary sheets, and return any remaining material at USGS expense. The contract is a firm‑fixed‑price purchase order with a performance period of one year (09/24/2026 – 09/23/2027).