Accuracy of the method for the mercury determination in the reference materials has been found to be between 3.5% and 5.9%. The proposed method has been validated by determining mercury in certified reference materials, Tuna fish (IAEA-350) and Aquatic plant (BCR-060). Limit of detection of this method was determined to be 2 ng/mL for inorganic mercury. Under the optimized parameters the repeatability, expressed as the percentage relative standard deviation of spectral peak area for mercury with 5% acetic acid was found to be 10% for acid blank solution and 5% for 20 ng/mL mercury standard based on multiple measurements with a multiple sample loading in flow injection mode. Acetic acid of 5% (v/v) with the 0.2 M acidity has been found to give 500% enhancement for mercury signal in flow injection mode. The addition of few percent of organic solvent, acetic acid produced significant enhancement in mercury signal. Effects of various low molecular weight organic solvents at different volume percentages as well as at different acid molarities on the mercury signal were investigated using ELCAD-AES. A method has been developed to improve the sensitivity of the electrolyte cathode discharge atomic emission spectrometry (ELCAD-AES) for mercury determination.
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