A method for determining mercury and arsenic in coal briquettes based on hydrothermal synthesis reactor digestion and atomic fluorescence spectrometry.

Abstract

This invention relates to the field of liquid phase chemistry, specifically to a method for determining mercury and arsenic in coal briquettes based on hydrothermal synthesis reactor digestion and atomic fluorescence spectrometry. The method involves adding a certain amount of coal briquettes and an appropriate amount of mixed acid to a pre-treated polytetrafluoroethylene (PTFE) sealed container (pre-treated by soaking, washing, and preheating) for pre-digestion until gas release occurs. After the reaction slows down, the container is covered, placed in a stainless steel sleeve, sealed, and placed in an electrically heated drying oven for sealed heating digestion. Then, acid removal and volume adjustment are performed to obtain the test solution. A series of standard solutions for mercury and arsenic are prepared, and a standard curve is plotted. The obtained digested solution is then tested using an atomic fluorescence spectrometer to obtain the fluorescence intensity. The content of the corresponding elements in the coal briquettes is calculated using the standard curve. This invention can accurately measure the content of volatile trace elements, such as mercury and arsenic, in coal briquettes.

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