Sulphide was determined spectrophotometrically at 628 nm and pH 6.7 based on its catalytic reduction of toluidine blue in the presence of Se(IV) using a flow injection system. After optimization of the measuring conditions the calibration curve was found linear up to 25 mg/mL and the detection limit was 0.3 mg/mL (30 mL injections). The ...

Ashless dialkyldithiophosphate (DDP) antiwear additives are good candidates to replace the widely used metallic DDPs such as zinc (ZDDP), which less environmentally friendly. A newly designed in-situ tribological rig was utilised perform synchrotron X-ray absorption spectroscopy (XAS) in order examine decomposition reactions of two types DDPs; acidic and neutral. The experiments showed that DDP...

sulphide was determined spectrophotometrically at 628 nm and ph 6.7 based on its catalytic reduction of toluidine blue in the presence of se(iv) using a flow injection system. after optimization of the measuring conditions the calibration curve was found linear up to 25 mg/ml and the detection limit was 0.3 mg/ml (30 ml injections). the relative standard deviation for the determination of 10 mg...

Tetrathionates have been found in significantly high concentrations recycled process waters from massive sulphide ore processing plants. These polythionates react with xanthate added to flotation pulps thus reducing dosages solution potentially affecting performance. The current study focused on the effect of tetrathionate-xanthate reaction mineral recoveries. Ore dissolution studies confirmed ...

In man the study of the harmful effects in bone of internally deposited radioactive material has been made either on subjects who have been given radium compounds internally for medicinal purposes, a practice now discontinued, or on subjects who have accidentally ingested-radium, and sometimes mesothorium, while working as luminous-dial painters. The use of self-luminous paints for watch dials ...

This article reports fibre-optic oxygen measurements on a reactive mine waste heap located in the polymetallic sulphide mine district of Freiberg in south-eastern Germany. The heaped material consists of sulphide-bearing tailings from a processing plant of a lead-zinc mine. Mine waste material was deposited in the water phase after separation of mining ores in a flotation process. The tailing i...

This paper presents the optical transmittance properties of thermally evaporated coatings ZnS/Ag nanostructures as a function film thickness and deposition angle designed to mitigate challenges indoor heating their effects on low temperature storage facilities. The were deposited glass by varying both silver zinc sulphide nanofilms at pressure 2.5×10-5 mBars in diffusion pump microprocessor vac...