Water intended for use as an ingredient in the production of beer (brewing liquor) or other foods
Mercury is reduced by sodium tetrahydroborate to its elemental form by allowing it to flow over a precious metal (e.g., a gold-platinum mesh) with the evolving hydrogen along with the assistance of an inert gas. By rapidly heating the adsorbent, the mercury is released again. It is transferred into a cuvette using a carrier gas where the absorbance is measured.
This method is described as a cold vapor technique.
The method describes how to determine the temperature of water using a thermometer.
Water intended for use as an ingredient in the production of beer (brewing liquor) or other foods
Measurement of the water temperature at the sampling location as well as the ambient room temperature is of consequence for evaluating analysis results, the solubility of gases in water and possible reactions. Sudden variations in the temperature of well water might indicate that surface water is entering the well.