SAMPLING METHOD AND ITS APPARATUS IN FLAMELESS ATOMIC ABSORPTION METHOD

摘要

PURPOSE:To enhance the uniformity in mixing of a sample and a specified material and to improve measuring accuracy by using a sucking/discharging nozzle, and sucking and discharging the sample and the specified material in the order of the specified material, the sample and the specified material. CONSTITUTION:A sample solution 22 is injected into a graphite cell 1. At this time, a specified material 21 is injected before and after the injection of the solution. Thus, the sepcified material 21, the sample solution 22, a standard sample solution 23, a blank solution 24 and the specified material 21 are deposited in this sequence. Thereafter, the cell 1 is heated with an electrode by feeding a current. The cell 1 is dried for a required time. The contact chance between the sample to be measured and the specified material which is the added material is increased in the furnace. Since the mixing degree is substantially enhanced in this way, the measuring accuracy in the flameless atomic absorption method can be enhanced. When the graphite cell which is the heating furnace is preheated, it is not necessary to provide a special step for heating and drying, and the measuring time can be shortened.