Barium is a metal, generally found in fresh water only in trace concentration. Concentrations above 1 mg/l in drinking water are considered to be toxic.
Laboratory analysis requires atomic absorption spectrometry or inductively coupled plasma techniques.
ChemScan Analysis Methods
The ChemScan analysis method uses a variation of the turbidimetric method
for sulfate analysis. A chloride is added to the sample at low pH, forming
barium sulfate. The resulting light absorbance at 420 nm is proportionate to
the barium concentration, after compensation for the original color and turbidity
in the sample.
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