Determination of tin and germanium with nonylfluorone and polymeric flocculants in plant materials

Abstract

New analytical systems «polymeric flocculant (PF)−nonylfluorone (NF)−metal ion» were proposed for spectrophotometric determination of germanium and tin in plant materials. It is shown the higher efficiency of the modifying action of PF nonionic nature (polyvinylpyrrolidone, PVP) compared with the cationic PF polyhexamethyleneguanidine chloride. The presence of PVP increases absorbance complex solutions of both metals on 3.5 times. It is found that the compositions of binary complex Ge(IV) and Sn(IV) being equal to 1:2 in the presence of PF. The interval of optimum values of acidity is pH 1−4, concentration of modifier (PVP) is 0.16 g/L. The difference in absorption of solutions PF–NF–metal and reference solution depends linearly on the concentration of metal in the range of 0.01−0.06 μg Ge(IV)/mL (ε=1.35∙105, λ=515 nm) and 0.18-0.90 μg Sn(IV)/mL (ε=4.2∙104, λ=520 nm). The developed method was tested in the determination of germanium in garlic and aloe and tin in pomegranate. The correctness of the results were confirmed by independent spectrophotometric methods which used phenylfluorone and quercetin as reagents.

Keywords

• germanium(IV)
• tin(IV)
• spectrophotometry
• polyhexamethyleneguanidine chloride
• polyvinylpyrrolidone
• trioxyfluorone