Measurement of Lithium
in Sea Water

The effect of potential interference from other constituents of sea water was studied, including sodium, chloride and potassium.    

It was found that pre-concentration of the sea water was not necessary prior to analysis. A filtration of the sample was only necessary if sample contained suspended material.   



Deionized distilled water is used throughout. Glassware is acid cleaned in nitric acid and rinsed thoroughly in deionized water prior to use to avoid contamination.


A single point calibration should be carried out to estimate the concentration of Lithium. From this estimate, standard solutions should be made to cover a range to give a better determination of the samples concentration of lithium.


Preparation of Standard Graph

Set the flame photometer in accordance to MultiPoint/Single Ion Calibration found on page 24 of the BWB Technologies Installation and Operation Manual, to measure potassium emission. Nebulize the working standard solutions and adjust the controls until steady zero and maximum readings are obtained. Nebulize the intermediate working standard solutions and construct a graph relating raw emission data (known as RAW in  BWB the flame photometer) to concentration of all the standard solutions.