Some figures of merit of a new double focusing inductively coupled plasma mass spectrometer

摘要: An ICP-MS instrument with a quadrupole filter is hampered by its limited resolution, in particular polyatomic ions are major source of interference. With double focusing magnetic sector mass analyser, operated at high most these interferences eliminated. In addition, analysers characterized low instrumental background, yielding superior detection limits resolution. this work new type instrument, the ‘Element’ from Finnigan MAT (Bremen, Germany), was tested. The can be used resolution (m/Δm= 300, 10% valley definition) and settings (3000 7500). At linear response versus curve observed [response 180 × 106 counts s–1 per µg ml–1(ppm) for U 6 Be]. sensitivity decreases roughly factor 14 when going 300 to 3000 10 7500. limit about 8 fg ml–1(8 ppq) measured m/z 240. elements not determined but blank level laboratory procedures will need improved order make optimal use power instrument. stability relative abundance oxide doubly charged comparable values found ICP-MS. Matrix effects were compared measurements Perkin-Elmer Elan 5000 115In presence 500 ml–1 Cs 2.5% ethanol. Though accelerated over kV immediately after skimmer, matrix similar those ‘Elan 5000’. determine Pt an environmental material (grass).