Study the Effect of Some Factors on the Determination of Mercury by Cold Vapor Technique (CV-AAS)
Abstract
In this research, the optimal conditions for some factors affecting the determination of mercury concentrations by Cold Vapor Atomic Absorption Spectrometry method were studied. These factors included: delay time, in addition to both: Reductant concentration and Linearity of Calibration Curve. The delay time was studied within the range (30 - 60 S), while the concentrations of the reductant were studied within the range (1 – 12 % w/v), As for the linearity of the calibration curve, the atomic absorbance was measured within the range of mercury concentrations (5 - 100 µg/L). The results related to the delay time showed that the highest atomic absorbance obtained for mercury was at a time of (60 S), while the highest atomic absorbance was recorded for the reductant was at the concentration (5 % w/v). On the other hand, with regard to linearity of calibration curve, the results showed the existence of a very strong linear relationship between the concentration of mercury and the atomic absorbance within the studied range, where the value of the correlation coefficient reached the value of (R2 = 0.997). As for the detection limit under the previous optimal conditions, it recorded a value of (0.012 µg/l), which is the minimum concentration of mercury that can be measured by the atomic absorption method using the cold steam technique.
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