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monochromator slit width. (Increasing the lamp current would also reduce UBE.) However, in none of the cases investigated would this produce a significant reduction in the total absorbance noise. (Even if up were reduced to zero, OA would not be reduced by more than 30% in any case.) In addition, increasing the lamp current or slit width would lead to a reduction of the absorbance signal in many cases and consequently have a detrimental effect on the detection limit.Lamp flicker noise can be reduced by using a double beam system to monitor changes in lamp intensity. However, if the lamp duty cycle is unchanged, the double beam system necessitates halving the time of observation of the lamp. This

Amplification is traditionally conceived to be performed In analysis by means of electronics, after the measurement step. However, amplification may also be performed chemically, before the measurement step. Such methods are beginning to appear Increasingly on the analytical scene. By Imparting

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