Graduate Thesis Or Dissertation
 

Cold vapor atomic absorption and fluorescence analysis of mercury

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  • A critical study of the cold vapor atomic absorption and fluorescence instrumentation for the analysis of mercury is described. Some of the important modifications involve the reduction vessel, absorption cell, fluorescence cell, and radiation source. The new modified systems have much greater calibration sensitivities and lower detection limits than those of systems previously employed. Chemical and physical problems such as contamination and mercury loss are discussed. Finally, an evaluation of the sources of imprecision in the measurements is presented. This new cold vapor AA and AF system has a capability of analyzing 30 samples per hour, has a detection limit of 1 ppt Hg(II) for AA, and has a detection limit of 7 ppt Hg(II) for AF. The relative precision is 3% above 0.05 ppb Hg(II) for AA and AF, and for AA the relative precision is better than 10% down to 5 ppt. This system is the first capable of directly analyzing Hg(II) solutions below 0.02 ppb, which makes it highly advantageous for the analysis of mercury in natural waters. It has been used to analyze water samples that are about 10 ppt in mercury.
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