Electrochemical X-ray fluorescence spectroscopy for trace heavy metal analysis: enhancing X-ray fluorescence detection capabilities by four orders of magnitude.

摘要: The development of a novel analytical technique, electrochemical X-ray fluorescence (EC-XRF), is described and applied to the quantitative detection heavy metals in solution, achieving sub-ppb limits (LOD). In EC-XRF, preconcentration species interest onto target electrode achieved here by cathodic electrodeposition. Unambiguous elemental identification quantification metal concentration then made using XRF. This simple step improves LOD energy dispersive XRF over 4 orders magnitude (for similar sample preparation time scales). Large area free-standing boron doped diamond grown microwave plasma chemical vapor deposition techniques found be ideal as material for both electrodeposition due its wide solvent window, transparency beam, ability produced mechanically robust freestanding thin film form. During it possible vary b...