plant was incinerated at 480°c and the rhenium was ex-tracted from the ash using an alkaline solution. rhenium content in the solution was determined using a highly sen-sitive catalytic method for rhenium determination with n n-dimethyldithiooxamide or dmdto. test results show that all four plant species are re hy-
rhenium . rhenium has a stable isotope rhenium which nevertheless occurs in minority abundance a situation found only in one other element ().naturally occurring rhenium is 37.4% 185 re which is stable and 62.6% 187 re which is unstable but has a very long half-life (~10 10 years). this lifetime is affected by the charge state of rhenium
rhenium is a heavy transition refractory metal with a melting point of 3180°c and has the highest modulus of elasticity of all the refractory metals (420 gpa). rhenium and rhenium containing alloys are unique with high melting points high moduli of elasticity and excellent high temperature mechanical properties.
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advantages of rhenium phytomining by lucerne and clover from ore dressing soils ognyan bozhkov and christina tzvetkova laboratory of analytical chemistry and laboratory of inorganic salts institute of general and inorganic chemistry bulgarian academy of sciences acad. g. bontchev str. bl.11 sofia bulgaria e-mail: bozhkovsvr.igic.bas.bg
rhenium wire is used in flash lamps for photography; rhenium catalysts are exceptionally resistant to poisoning from nitrogen sulphur and phosphorus and are used for hydrogenation of fine chemicals hydrocracking reforming and the disproportionation of alkenes
phytomining: new method for rhenium. inexpensive and environmentally friendly technique that leads to remediation of exhausted soils of copper mines and ore-dressing regions. the impact of