Determination of Phosphorus via PO Molecular Absorption Lines

One of the characteristics of HR-CS AAS is that no element-specific radiation source is required, and that, in principle, absorption can be measured at any wavelength, including molecular absorption bands. 

200mg/L P and lOOOmg/L Fe the iron line is eight pixels away from the PO band head 

The proposed method has been applied successfully to determine phosphorus in cast iron, in pine needles and in super phosphate fertilizer. The reported detection limit of 1.3 mg/L is almost two orders of magnitude better than that obtained by LS AAS in a nitrous oxide/acetylene flame at the 213.618 nm non-resonance line for phosphorus, and it is quite comparable with the LOD reported for GF AAS and ICPOES, except for those that are obtained in the vacuum-UV at 177.495 nm [82]. 

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