Spectrophotometric Determination of Germanium Following Collection on an Organic Solvent-Soluble Membrane Filter as the Complex with Phenylfluorone

Abstract

A spectrophotometric method is described regarding the determination of germanium. A colored complex of germanium with pheny fluorone was collected on an organic solvent-soluble membrane filter made of cellulose nitrate. The complex, together with the filter, was dissolved into N,IV dimethylformamide (3 cm3), and the absorbance of the solution was measured. The obtained calibration curve was linear from 0.05 to 1.0 µg of germanium and the molar absorption coefficient was 1.9x 105 dm3 mo -' cm-'. The relative standard deviation of the absorbance obtained at 1.0 µg of germanium was 0.4% ( n=11). The interference of molybdenum(VI) could be eliminated by hydrogen peroxide. The time required for one run was about ten minutes and germanium at 1 µg dm-3 levels could be easily determined. This method has been applied to the determination of germanium in samples of hot-spring water.

Separation and preconcentration of trace elements and their physico-chemical forms in aqueous media using inert solid membranes (Technical Report)

“…The concentrate can also be dissolved in an organic solvent together with the nitrocellulose or acetylcellulose filter prior to spectrophotometric measurement. A method was described for the determination of germanium [76]. A coloured complex of germanium with phenylfluorone was collected on a membrane filter.…”

Preconcentration–separation of germanium at ultra trace levels on polysulfone membrane filter and its determination by spectrophotometry

“…The 14 determination of trace and ultra-trace levels of germanium in 15 environmental samples has become important [6]. Some germanium 16 compounds have anticancer and health promotion functions so it is 17 often used in medicines and nutriments for human [7]. 18 Due to these points, the determination of germanium is an 19 important part of studies in analytical chemistry.…”

“…Solid phase extraction, cloud 23 point extraction, solvent extraction, microextraction and flotation 24 have been used for the preconcentration and separation of traces of 25 germanium in the environmental samples prior to its instrumental 26 detection [10][11][12][13][14][15][16]. 27 Membrane filtration is a preconcentration technique for traces 28 organic and inorganic species including germanium [9,[17][18][19][20][21]. The 29 membrane materialwith a strong affinity for hydrophobic species in 30 water are generally useful to retain the species by filtration.…”

Collection of Iron(III) from Homogeneous Aqueous Solutions on Membrane Filters Using Chromazurol B with Triton X-100

“…Recently, a new technique was developed for collecting a metal complex or an ion pair as a precipitate on a membrane filter from an aqueous solution by filtration under suction. [1][2][3][4][5][6][7][8][9][10][11] If the direct collection of a metal complex or an ion pair from a homogeneous aqueous solution can be conducted by membrane filtration, this technique can be applied to a rapid and convenient separation method of the major component 12 and a simple concentration method of the minor constituent as a pretreatment method for its determination.The reagents used for separating the major component as a metal complex are not always suitable for determining the trace element in analyzing the impurity of metallic materials. It is preferred that they cause no interference in the determination of the impurity, and can at least be easily removed by a simple operation.…”