Abstract: A plurality of elements in a sample are specified as monitoring elements. Each time at a exciting the sample, the light intensity of the line of the monitoring elements and the measured elements is detected and memorized. From the memorized data, the distribution for the light intensity of the line of each of the monitoring elements is determined. Based on the distribution, the preferred region for the light intensity of the line of each of the monitoring elements is defined. With reference to the memorized data, the light intensity of the line of the measured elements at every exciting in which the light intensity of the line of the monitoring elements is within the preferred region integrated.

Abstract: A quantitative analysis of the constituents in a specimen and being classified by the conditions of the constituents in the specimen, using a spectroscopic analysis is made by exciting the specimen a number of times for emission, detecting the light intensity data of the line of the constituent element and the non-constituent element of the specimen per emission, storing the light intensity data of the lines specifying emission which contains the constituent element and the non-constituent element over a predetermined level based on the stored data, and determining that there is present a composition of the constituent element and the non-constituent element at a portion of the specimen corresponding to the specified emission.

Abstract: Method and apparatus for emisson spectroscopic analysis by spark discharge, wherein each and every one of a number of spark discharges conducted for analysis of a sample comprises a high energy portion providing a sufficient amount of energy to vaporize the elements contained in the sample and a low energy portion providing a sufficient amount of energy to cause the vaporized elements to emit light, and wherein spectroscopic measurement is conducted in the low energy portion, or initiated in the end portion of high energy portion to continue in the low energy portion.

Abstract: A glow discharge tube for exciting a sample in emission spectrochemical analysis or mass spectrometry, in which glow discharge is effected between the anode tube and the sample while gas is being passed, for exhaust, through the narrow gap formed between the sample surface and the end of the insulating tube fit on the anode tube so as to maintain a constant pressure in the anode tube. Since the insulating tube projects further than the anode tube toward the sample side, a shortcircuit is never formed between the anode and the cathode even if sample vapor adheres to the walls surrounding the exhaust passage. As a result, efficient analysis can be achieved with the glow discharge tube of the present invention.