SYNTHESIS OF TETRAPHENYLLEAD BY ACTION OF METALLIC LEAD DUST ON PHENYLDIAZONIUM TETRAFLUOROBORATE

1963 ◽  
pp. 57-60
Author(s):  
K.A. KOCHESHKOV ◽  
M.M. NAD'
Keyword(s):  
Metallic Lead ◽  
Lead Dust

scholarly journals Synthesis of Valeric Acid by Selective Electrocatalytic Hydrogenation of Biomass-Derived Levulinic Acid

Catalysts ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 692
Author(s):  
Yan Du ◽  
Xiao Chen ◽  
Ji Qi ◽  
Pan Wang ◽  
Changhai Liang
Keyword(s):  
Levulinic Acid ◽  
Active Sites ◽  
Valeric Acid ◽  
Future Research ◽  
Adsorbed Hydrogen ◽  
Electrocatalytic Hydrogenation ◽  
Ambient Conditions ◽  
Metallic Lead ◽  
Faradaic Efficiency ◽  
Lead Electrode

The electrocatalytic hydrogenation (ECH) of biomass-derived levulinic acid (LA) is a promising strategy to synthetize fine chemicals under ambient conditions by replacing the thermocatalytic hydrogenation at high temperature and high pressure. Herein, various metallic electrodes were investigated in the ECH of LA in a H-type divided cell. The effects of potential, electrolyte concentration, reactant concentration, and temperature on catalytic performance and Faradaic efficiency were systematically explored. The high conversion of LA (93%) and excellent “apparent” selectivity to valeric acid (VA) (94%) with a Faradaic efficiency of 46% can be achieved over a metallic lead electrode in 0.5 M H2SO4 electrolyte containing 0.2 M LA at an applied voltage of −1.8 V (vs. Ag/AgCl) for 4 h. The combination of adsorbed LA and adsorbed hydrogen (Hads) on the surface of the metallic lead electrode is key to the formation of VA. Interestingly, the reaction performance did not change significantly after eight cycles, while the surface of the metallic lead cathode became rough, which may expose more active sites for the ECH of LA to VA. However, there was some degree of corrosion for the metallic lead cathode in this strong acid environment. Therefore, it is necessary to improve the leaching-resistance of the cathode for the ECH of LA in future research.

Field Evaluation and Comparison of Five Methods of Sampling Lead Dust on Carpets

AIHA Journal ◽  
2003 ◽  
Vol 64 (4) ◽  
pp. 528-532 ◽  
Author(s):  
Zhipeng Bai ◽  
Lih-Ming Yiin ◽  
David Q. Rich ◽  
John L. Adgate ◽  
Peter J. Ashley ◽  
...  
Keyword(s):  
Field Evaluation ◽  
Lead Dust

BOY HARMED BY LEAD TO GET $1.5 MILLION IN COURT SETTLEMENT

PEDIATRICS ◽  
1994 ◽  
Vol 94 (4) ◽  
pp. 557-557
Author(s):  
J. F. L.
Keyword(s):  
Attention Deficit Disorder ◽  
Health Department ◽  
Insurance Company ◽  
Circuit Court ◽  
Milwaukee County ◽  
Lead Dust ◽  
The Family ◽  
Lead Levels ◽  
Federal Standard ◽  
The City

A 5-year old boy who was poisoned by lead during his landlord's attempts to clear his apartment of lead-based paint will receive up to $1.5 million over his lifetime from the landlord's insurance company. The boy has attention deficit disorder with hyperactivity. In reports filed with the Milwaukee County Circuit Court, doctors said the disorder had either been caused by the lead poisoning or had been made worse by it. ...In the summer of 1991, the city health department discovered that the boy's blood contained lead levels that were three times the Federal health standard. In June 1992, the city ordered the owners of the apartment building, a converted 65-year-old frame house, to begin removing the lead-based paint. But instead of alleviating the victim's problem, their scraping of the paint spread lead dust throughout the home. As a result, lead levels increased to eight times the Federal standard. The family sued, contending negligence.

scholarly journals Post mortem analysis of burned magnesia-chromite brick used in short rotary furnace of secondary lead smelting

Cerâmica ◽  
2009 ◽  
Vol 55 (333) ◽  
pp. 61-66 ◽  
Author(s):  
E. Prestes ◽  
A. S. A. Chinelatto ◽  
W. S. Resende
Keyword(s):  
Reduction Process ◽  
Rotary Furnace ◽  
Furnace Lining ◽  
X Ray Diffraction ◽  
Good Resistance ◽  
Metallic Lead ◽  
Parallel Cracks ◽  
Standard Product ◽  
Short Service Life ◽  
Powder Analysis

Burned magnesia-chromite bricks are the standard product for the lining of furnaces in lead industry, where the short service life is a great problem. Used sintered magnesia-chromite brick sample from short rotary furnace lining, sent by a secondary lead manufacturer, showed parallel cracks to the hot face due to structural spalling damage. The refractory infiltrated region and slag interface were analyzed using a scanning electron microscope with an energy dispersive spectroscopy analyzer, and X-ray diffraction powder analysis. Crucible corrosion test was performed to evaluate the influence of slag attack. The results showed that the structural spalling was due to strong Pb-infiltration of the refractory microstructure by bath components of the furnace (metallic lead and lead sulphite) during the reduction process and that the slag infiltration had little contribution due to the good resistance of the magnesia-chromite bricks to FeO rich slag attack.

scholarly journals Investigation of quantum transport and local density of states in a graphene strip connected to a square lattice

2021 ◽  
Author(s):  
Elnaz Rostampour
Keyword(s):  
Quantum Transport ◽  
Dirac Point ◽  
Local Density ◽  
Square Lattice ◽  
Density Of State ◽  
Metallic Lead ◽  
Resonant Tunnelling ◽  
Quantum Billiard ◽  
Plasmon Polaritons ◽  
Theoretical Results

Abstract We theoretically express quantum transport at Dirac points via graphene quantum billiard as a non-magnetic material to connect metallic leads. Our results indicate that the quantum billiard of graphene is similar to a resonant tunnelling device. The centerpiece size and the Fermi energy of the graphene quantum billiard play an important role in the resonant tunnelling. In graphene, change of carrier density can affect plasmon polaritons. At the Dirac point, the conductivity of graphene depends on the geometry, so that the conduction of the evanescent modes is close to the theoretical value of 4e2/πh (where Planck's constant and the electron charge are denoted by h and e, respectively.). This transport property can be used to justify chaotic quantum systems and ballistic transistors. Our theoretical results demonstrate that the local density of state of the graphene sheet for EL = ER = 0 is larger than EL = ER = t (where EL (ER) is onsite energy of the left (right) metallic lead) unlike the current obtained from the calculations.

scholarly journals EFEKTIFITAS JALUR HIJAU DALAM MENGURANGI POLUSI UDARA OLEH KENDARAAN BERMOTOR

NALARs ◽  
2017 ◽  
Vol 16 (1) ◽  
pp. 91
Author(s):  
Lukmanul Hakim ◽  
Priambudi Trie Putra ◽  
Azka Lathifa Zahratu
Keyword(s):  
Canopy Structure ◽  
Tree Canopy ◽  
Toxic Substances ◽  
Main Function ◽  
Cross Sectional ◽  
Green Belt ◽  
Healthy Environment ◽  
Lead Dust ◽  
The Many ◽  
Selection Of

ABSTRAK. Ameliorasi iklim adalah salah satu manfaat yang diberikan alam khususnya tumbuhan terhadap lingkungan hidup, dengan cara meningkatkan kualitas lingkungan untuk menjamin tersedianya lingkungan yang sehat. Salah satunya adalah dengan menyediakan oksigen (O2) untuk kebutuhan pernafasan dan meminimalisir gas buang kendaraan bermotor yang beracun seperti gas carbon monooksida (CO) dan debu timbal (Pb). Kedua zat beracun ini sangat berbahaya bagi kesehatan manusia, khususnya yng berada disekitar jalan raya dan sekitar kawasan industri.Green belt adalah salah satu desain penghijauan yang fungsi utamanya adalah untuk mengurangi debu pencemaran ini. Yang diuji dalam penelitian ini adalah efektifitas desain green belt di sisi jalan raya dalam menangkap atau menjerap partikel (debu) polusi yang ditimbulkan oleh kendaraan bermotor. Fakta dalam percobaan yang dilkukan menunjukkan, bahwa bentuk struktur tajuk dan luas penampang daun sangat menentukan efektifitas dari penyerapan debu polusi. Daun yang mempunyai permukaan yang lebih luas dan mempunyai permukaan yang kasar, mempunyai nilai efektifitas yang tinggi. Begitu juga dengan pohon yang bertajuk rapat dan lebat akan sangat efektif dalam menjerap debu polusi atau polutan. Dalam hal ini, untuk desain green belt, diperlukan beberapa pertimbangan untuk efektifitas dalam mengurangi polusi udara. Yaitu pemilihan jenis vegetasi yang mempunyai daun yang lebar dan kasar serta pemilihan jenis struktur tajuk pohon yang disesuaikan dengan lokasi green belt tetapi dipilih yang rimbun dan lebat.Kata kunci: Ameliorasi iklim, vegetasi, penyerapan dan polusiABSTRACT. Climate amelioration is one of the many benefit from that nature, particularly plant that, provides to the environment, by enhancing quality of environment and guaranting the provision of healthy environment. For example is by providing oxygen (O2) for respiration and minimalizing toxic gas such as carbon monoxide (CO) and lead dust (Pb) emitted by vehicle. Both mentioned are toxic substances which highly dangerous for human health, especially for those residing around streets and industrial areas.Green belt is a greening design having main function to reduce pollution dust. This research tested the effectiveness of green belt on side roads in catching or absorbing pollution dust or particles emitted by vehicles. Facts from this research showed that the shape of canopy structure and leaves’ cross sectional area highly determine the effectiveness of pollution dust absorpsion. Leaves with wider surface area and rough texture have high effectiveness. Trees having dense canopy and bushy are very effective in absorpsion of pollution dust. In this case, to design a green belt will required a few considerations that are affecting effectiveness in reducing air polution. Namely, selection of vegetation that has wide and rough leaves and type selection of tree canopy structure that is dense and bushy and suitable to green belt location.Keywords : climate amelioration, vegetation, absorpsion and pollution

scholarly journals Lead dust in Broken Hill homes - a potential hazard for young children?

2002 ◽  
Vol 26 (3) ◽  
pp. 203-207 ◽  
Author(s):  
F. Boreland ◽  
DM. Lyle ◽  
J. Wlodarczyk ◽  
W.A. Balding ◽  
S. Reddan
Keyword(s):  
Young Children ◽  
Potential Hazard ◽  
Broken Hill ◽  
Lead Dust
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