Conventional Flame Photometry and Emission Flame photometry Potassium analysis of rocks and minerals using conventional flame photometry is the most popular method of ordinary potassi- um analysis. Ogata, An age determination by K-Ar method, Bull. These results strongly suggest that having only 0. If linearity is obtained for a plot of the photon intensity of potassium in the solutions against the amount of artificially added potassium, then quantitative potassium analysis is possible. Yoshiyuki Tatsumi and for their support and encouragement. The analytical detection limit for potassium is now about 0. The first improvement was still not sufficient for the low and very low potassium analysis described later because of a signifi- cant amount of dust contamination during the evaporation drying to the acid treated materials in the commercially to enable low and very low potassium analysis in In this manuscript, we summarized ultra low potassium analysis without graphite furnace method. The method cancels out the matrix effect on photon intensity because all solutions have the same chemical background and differ only in the addition of different amount of STD potassium. The 3 clean rooms 2 chemical preparation rooms and an analysis room are controlled air condition that all refreshed-type filtering air should be installed for independent experiment in each room but more dustless clean room should be kept higher pressure to avoid contamination from worker Fig. To overcome these difficulties, we have developed a method to analyze very low potassium in rocks and minerals conveniently and precisely using flame photometry wit Zeeman. However, if such low potassium can be analysed conveniently but also pre- cisely by ordinary flame photometry with Zeeman, some geologi- cal scientists might have the motivation to date the rocks and to crosscheck data from one mineral against another, and as a result, the availability of the sensitivity method of K-Ar method may be evaluated for the dating of mafic and ultramafic rocks. The Polarized Zeeman Method delivers low noise and superior stability for both flame furnace atomizations.
It is concluded that the sensitivity method of K-Ar method is more applicable to the geochronology of the low contents of potassium. To overcome these difficulties, we have developed a method to analyze very low potassium in rocks and minerals conveniently and precisely using flame photometry wit Zeeman. The Polarized Zeeman Method delivers low noise and superior stability for both flame furnace atomizations. Table 2 shows the two independently obtained potassium con- tents of JB-1, 2 and 3, JA-1, 2 and 3, JR-1, 2 and 3, JF-1 and JP-1 which are the chemical standards provided by the Geological Survey of Japan, with conventional potassium analytical method described by Nagao et al. Figure 2 shows the correlation between the two types of potassium values obtained independent- ly using the conventional potassium analytical method and the very low potassium analytical method by flame photometry. However, other coexisting alkali and alkali earth elements inter- fere with the potassium analysis, making the apparent photon inten- sity for potassium increase. Suzuki, to provide some important advice making design of clean room laboratory. We special thank to provide us geochemical standard for Dr. We designed new facility of clean room laboratory and new filtering air control for lower blank of chemical analysis Fig. Blank and waters blank. The following chemical treatment is used to prepare the solution from rock and mineral samples for analysis by flame photometry: We use emission mode with high concentrations of K, and Flame mode with moderate-very low concentration of K, furnace mode with ultra trace concentration. The photon detecting systems parameters are cancelled in the calibration curve method, if variable STD solutions are prepared. These results strongly suggest that having only 0. The pho- ton intensities of well calibrated STD solutions, which are gener- ally lower than 10 ppm K, are compared with those of unknown sample solutions. Even better, the furnace autosampler, which is built permanently into the spectrometer itself, provides direct access to the furnace cuvette. The other low potassium samples are significantly displaced from the line and the value obtained by the conventional method [Nagao et al. The photon intensity is related to the potassium content of the solution by complicated parameters which depend on sample chemistry and the electronic conditions of the photon detecting system of the flame photometer. In this manuscript, we summarized ultra low potassium analysis without graphite furnace method. The separates were leached with diluted HNO 3 to decompose any sociated chlorite and organic materials. This paper describes the analysis of low and very low potassium in rocks and minerals by flame photometry with ultra low blank chemical lines examples of GSJ geological STD are presented with some discus- sions to evaluate the method. At the start of the analysis, the Z optimizes each instrument parameter. The method cancels out the matrix effect on photon intensity because all solutions have the same chemical background and differ only in the addition of different amount of STD potassium. Ohira, Very low potassium analysis by flame photometry using ultra low blank chemical lines; an application of K-Ar method to ophiolites, Geochemical Journal, 30, , Ogata, An age determination by K-Ar method, Bull. Previous workers have never tried to date low potassium sample using the conventional K-Ar method because of the widespread belief that it is difficult to obtain a precise analysis of very low potassium and because of the potential existence of excess argon.
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