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Spectral Interference in the Determination of Molybdenum in Geological Samples by ICP‐AES: A Reassessment
Author(s) -
Agnihotri Rajesh,
Sarin Manmohan
Publication year - 2001
Publication title -
geostandards newsletter
Language(s) - English
Resource type - Journals
eISSN - 1751-908X
pISSN - 0150-5505
DOI - 10.1111/j.1751-908x.2001.tb00605.x
Subject(s) - molybdenum , analytical chemistry (journal) , wavelength , attenuation , dissolution , inductively coupled plasma atomic emission spectroscopy , interference (communication) , detection limit , signal (programming language) , materials science , chemistry , inductively coupled plasma , optics , environmental chemistry , optoelectronics , physics , chromatography , plasma , metallurgy , channel (broadcasting) , electrical engineering , quantum mechanics , engineering , computer science , programming language
Molybdenum concentrations in USGS reference materials and marine sediments have been measured using ICP‐AES following dissolution of samples in HF‐HNO 3 ‐HCl with final aliquots made in 1 mol l −1 HCl. The concentrations determined at one of the recommended wavelengths, 281.615 nm, are found to be severely affected by a spectral interference from Al, leading to inaccurate analytical results. At an alternative wavelength, 202.030 nm, the Mo emission signal is attenuated in the window size 0.094 nm due to the presence of an Fe line (202.074 nm), thus affecting the analytical sensitivity of measurements. The attenuation of the emission signal at 202.030 nm could severely limit the determination of Mo in geological samples.