Measurement by Flame Micro Sampling Method

Introduction

The AA-6300 combined with an autosampler ennables the automated flame micro sampling method. In the flame micro sampling method, flame atomic absorption analysis is conducted with small sample quantities (2 - 100μL), while in the conventilnal flame method (hereafter “flame continuous suction method”), the sample is continuously aspirated so rather large amount of sample is necessary. Table1 shows the comparison of the flame micro sampling method with the flame continuous suction method. The flame micro sampling method has sevral advantages over the flame continuous suction method: analysis is possible with a small amount of sample, and when an autosampler is used, automatic dilution of the sample and automatic addition of interference inhibitor are possible. Moreover, since only a small amount of sample is introduced, the flame micro sampling method is effective for analysis of high matrix samples which may cause clogging of the burner by the flame continuous suction method. We introduce here an example of analysis of Na and Mg in the standard river water sample, using the flame micro sampling method. (The standard riverwater; JAC0031, unspiked, cetified values for Na;4.2±0.1mg/L and Mg;2.83±0.06mg/L, provided by the Japan Society of Analytical Chemistry)

November 25, 2005 GMT