Key wordsicp, blend, tbt, organotin, rbc, isotope, dbt, spike, hplc, tpht, mass, mbt, r’b, r’bc, added, amount, fraction, w’x, shieldtorch, sample, ase, myc, compared, ratio, sediment, dpht, idms, mpht, tebt, calibration, measured, make, uncertainties, standard, fitted, bias, primary, analysis, filled, gas, platinum, different, used, certificate, enriched, dilution, gases, plasma, response, factor