To investigate the source of pollution, the lead and copper content of all samples were separately determined after successive treatment with water, then with acetone and, finally, complete decomposition in a HNO3/H2SO4/H2O2 mixture. Metal levels in raisin seeds were also determined. The results ...
DETROIT (WJBK)-About two-thirds of Detroit public schools where results have been provided tested positive for elevated levels of copper and/or lead, according to the Detroit Public Schools Community District. DPSCD says test results showed that 57 of 86 schools where test results have been provi...
Namely, adsorption and desorption of trace metals from and onto sampling, storing and measuring vessel surfaces yield irreproducible analytical data and biased results of metal complexing capacity.The adsorption rates of dissolved lead(II) and copper(II) (at the level from 2 to 810-8 M) from ...
Otherwise, isopropyl xanthate (IPX) was also used as a collector of both: lead and copper. The results revealed that in the presence of non-conventional collectors, the increase in pyrite recovery due to the activation by copper and lead species, was noticeably smaller than that exhibited when...
Crawford that I am well aware of the difficulties involved in the theory that the builders of megalithic monuments were attracted to this country by the stores of gold, copper, lead, and so forth, that it contained, and that I discussed the very points to which he directs attention. It ...
The results suggested that the chelators effectively extracted lead and cooper from the contaminated soil, with ADA particularly effective for lead, the major contaminant of the soil. The chelators were recovered and reused over consecutive runs with no loss in performance. The extraction ...
An extraction system of ammonium pyrrolidinedithiocarbamate (APDC)-methyl isobutyl ketone (MIBK) was used for a pretreatment in the flameless atomic absorpion spectrophotometric determination of cadmium, lead, and copper. The extract (30μl) was injected into the carbon tube, dried, ashed, and at...
The article presents results of research on the possibility of separation of useful components from copper slag using the original method of sieve analysis, gravitational enrichment and magnetic separation. Preliminary results of tests were made on a laboratory scale. Then, selective leaching of copper...
The University of South Carolina has been involved in numerous studies to evaluate lead and copper corrosion control strategies for low hardness, low alkalinity waters found in South Carolina. This article discusses the results of three batch studies where the effects of pH and alkalinity adjustment,...
The influent concentration of copper was all 7.44 mg l−1, the mass of chaff in the column was 2.24 g, value of pH was 3.0, 4.0 and 5.0, respectively. The flow rate was all 7.5 ml min Conclusion On the base of the theoretical and experimental results of this investigation, the ...