QUANTITATIVE ANALYSIS METHOD FOR B IN SAMPLE CONSISTING ESSENTIALLY OF ZNO BY PLASMA EMISSION SPECTROSCOPIC METHOD

摘要

PURPOSE:To measure the B in a smaple, particularly the B in a voltage non-liner resistor quickly with high accuracy and to use the same for quality control by pulverizing the sample then dissolving the same in a pressurizing curcible by using HCl, making the volumn thereof constant and determining the B in the soln. by a plasma emission spectroscopic method. CONSTITUTION:After a sample is fine ground, it is dissolved in a pressurizing crucible by using HCl. The soln. prepd. to contant volume with constant concn. of HCl is sprayed into a plasma flame and the emission thereof is spectroscopically analyzed, thereby the trace amt. of B in the sample is determined. The calibration curve obtd. by measuring a sample of a known content of B with a soln. of a constant concn. of HCl and constant volume is prepared beforehand, and the measured value of the sample is known. Particularly the content of B in a voltage non-linear resistor affects the life of elements largely, and can be determined quickly with high accuracy by the above-described analytical method; therefore it is suited for controlling the quality and processes of the elements. It is possible to eliminate disturbance by the elements coexisting in the sample by adding said elements beforehand in the soln. for formation of the calibration curve at the same concn.