Development of a novel digestion method utilizing a new PTFE digestor for the rapid and reliable determination of technology-critical elements (TCEs) in granite samples by ICP-OES: A simple approach for the analysis of complex geological matrices.

A new and high performance polytetrafluoroethylene (PTFE) digestor was designed and fabricated in-house for the total dissolution of granite samples for the determination of technology-critical elements (TCEs) by inductively coupled plasma optical emission spectrometry (ICP-OES). Initially, the granite sample (∼0.25 g) was placed in the PTFE digestor and added 8 mL(v/v) of 20%HF+40%HCl+10%HNO acid mixture.

A novel UV-photolysis approach with acetone and isopropyl alcohol for the rapid determination of fluoride in organofluorine-containing drugs by spectrophotometry.

A UV photolysis decomposition (UVPD) method for the determination of fluoride in fluorine containing pharmaceuticals by spectrophotometry is reported. It is based on the use of high intensity UV-irradiation in the presence of a digesting solution comprising a mixture of acetone and isopropanol. For the optimization of the UVPD procedure, three bulk drugs (levofloxacin, nebivolol and efavirenz) were chosen as representatives of three diverse compounds containing a single fluorine atom, two fluorine atoms, and trifluoromethyl groups respectively.