MECHANISM OF PEAK DRIFT OF A GRATING MONOCHROMATOR AND A DESIGNED SEQUENTIAL INDUCTIVELY-COUPLED PLASMA SPECTROMETER WITH AN INTELLIGENT WAVELENGTH CALIBRATING DEVICE

The mechanism of the peak drift of exit spectral lines of a grating mo nochromator was studied experimentally and theoretically, The results indicate that the peak drift is due not only to temperature change, bu t also to wavelength change and systematic errors, Equations describin g the non-linear functional relationship between peak drift, wavelengt h and temperature were obtained. Based on these equations, a computer wavelength-calibrating program was developed, and an intelligent wavel ength-calibrating device was designed for use with a sequential ICP sp ectrometer instead of the conventional local thermostat or the real-ti me line-profile method. The sequential ICP spectrometer with the intel ligent wavelength-calibrating device (designated the ICP-IWC) was used to analyse various standards. The analytical results mere in good agr eement with the certified values, and the RSDs of the determinations w ere about 1%. Compared with the use of the conventional local thermost at or the line-profile method, the ICP-IWC has been shown to be effect ive; the IWC device is easy to construct and should find wide applicat ion.