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A flow analysis (FA) procedure for the measurement of soluble silicon with respect to the total Si concentration is described. After solubilization in H 2 O, in alkaline solutions or in concentrated HF, silicon is determined by the molybdenum blue spectrophotometric method. The effects of Si complexation by F - are considered as are the decomplexing capacities of H 3 BO ...
A method for the UV-visible spectrophotometric determination of silicon in airborne particulate matter collected on a filter membrane is described. It comprises a two-step digestion procedure with a mixture of HNO 3 +HCIO 4 followed by HF (after removal of the filter) in a PTFE closed vessel system, followed by the addition of H 3 BO 3 to remove the interference of...
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