| 摘要 |
PURPOSE:To prevent the mixing of impurities by sampling Na into a sampling cup from a circulation piping with an Na sample container made negative to keep the amount of sampling constant. CONSTITUTION:An Na sampling cup 31 is built into an Na sample container 14. Normally, Na exists in a circulation piping 10. For sampling, valves 7, 9 and 12 are closed while valves 18, 19 and 28 are opened and with the suction by a vacuum pump 29, an Na tank 24 and the sample container 14 are reduced negative. Then, the sample container is heated with a heater 32 upto about 500 deg.C to remove impurities. Then, the valve 12 is opened and Na in the circulation piping 10 is sucked and sampled into the sampling cut 31 in the sample container 14. Thereafter, the sample container 14 is separated from a sampler and the sample is carried to an analysis chamber to analyze. Therefore, the sampling on negative conditions facilitates the sampling in a fixed amount to prevent mixing of impurities thereby enabling a higher reliability of the analysis value. |
