Ceiling: 5 mg(Mn)/m3 (ACGIH and OSHA)
TWA: 1 mg(Mn)/m3 (NIOSH).
物理描述:
Manganese appears as a lustrous brittle silvery solid. (NIOSH, 2016)
颜色/状态:
Hard grey metal
蒸汽压力:
1 Pa at 955 °C (solid); 10 Pa at 1074 °C (solid); 100 Pa at 1220 °C (solid); 1 kPa at 1418 °C /liquid/; 10 kPa at 1682 °C /liquid/; 100 kPa at 2060 °C /liquid/
... This study investigated the tissue distribution of manganese in iron-sufficient and iron-deficient rats after welding-fume exposure. The feeding of an iron-deficient diet for 4 wk produced a depletion of body iron, such as decreased iron levels in the serum and tissues, and upregulated the divalent metal transporter 1 expression in the rat duodenum. The iron-sufficient and iron-deficient rats were then exposed to welding fumes generated from manual metal arc stainless steel at a concentration of 63.5 +/- 2.3 mg/cu m for 2 hr per day over a 30-day period. Animals were sacrificed on days 1, 15, and 30. The level of body iron in the iron-deficient rats was restored to the control level after the welding-fume exposure. However, the tissue distributions of manganese after the welding-fume exposure showed similar patterns in both the iron-sufficient and iron-deficient groups. The concentration of manganese increased in the lungs and liver on days 15 and 30, and increased in the olfactory bulb on day 30. Slight and heterogeneous increases of manganese were observed in different brain regions. Consequently, these findings suggest that the presence of Fe in the inhaled welding fumes may not have a significant effect on the uptake of Mn into the brain. Thus, the condition of iron deficiency did not seem to have any apparent effect on the transport of Mn into the brain after the inhalation of welding fumes.
... To investigate the movement of manganese after welding-fume exposure, six cynomolgus monkeys were acclimated and assigned to three dose groups: unexposed, low dose (31 mg/cu m total suspended particulate [TSP], 0.9 mg/cu m of Mn), and high dose (62 mg/cu m TSP, 1.95 mg/cu m of Mn) of total suspended particulate. The primates were exposed to manual metal arc stainless steel (MMA-SS) welding fumes for 2 hr per day in an inhalation chamber system equipped with an automatic fume generator. Magnetic resonance imaging (MRI) studies were conducted before the initiation of exposure and thereafter every month. The tissue Mn concentrations were then measured after a plateau was reached regarding the shortening of the MRI T1 relaxation time. A dose-dependent increase in the Mn concentration was found in the lungs, while noticeable increases in the Mn concentrations were found in certain tissues, such as the liver, kidneys, and testes. Slight increases in the Mn concentrations were found in the caudate, putamen, frontal lobe, and substantia nigra, while a dose-dependent noticeable increase was only found in the globus pallidus. Therefore, the present results indicated that a shortening of the MRI T1 relaxation time corresponded well with the Mn concentration in the globus pallidus after prolonged welding-fume exposure.
来源:Hazardous Substances Data Bank (HSDB)
安全信息
职业暴露等级:
C
职业暴露限值:
TWA: 1 mg/m3, STEL: 3 mg/m3 [*Note: Also see specific listings for Manganese cyclopentadienyl tricarbonyl, Methyl cyclopentadienyl manganese tricarbonyl, and Manganese tetroxide.]
1.周国泰,化学危险品安全技术全书,化学工业出版社,1997 2.国家环保局有毒化学品管理办公室、北京化工研究院合编,化学品毒性法规环境数据手册,中国环境科学出版社.1992 3.Canadian Centre for Occupational Health and Safety,CHEMINFO Database.1998 4.Canadian Centre for Occupational Health and Safety, RTECS Database, 1989
Reactions in mixed non-aqueous systems containing sulphur dioxide. Part 2. The dissolution of transition metals in the binary mixture dimethyl sulphoxide–sulphur dioxide, and ion-pair formation involving the sulphoxylate radical ion in mixed solvents containing sulphur dioxide
作者:W. David Harrison、J. Bernard Gill、David C. Goodall
DOI:10.1039/dt9790000847
日期:——
The metals (Ti, V, Mn, Fe, Co, Ni, Cu, Zn, and Cd) react with the mixednon-aqueous solvent dimethylsulphoxide–sulphurdioxide to form the metal disulphates. Other metals (M = Ce, Pr, Eu, Dy, or U) dissolve in the mixed solvent, but it has not been possible to characterize the products. The existence of the [SO2]– radical ion, and of ion pairs containing a metal ion and [SO2]–, has been demonstrated
Syntheses and X-ray characterization of metal complexes with the pentadentate thiosemicarbazone ligand bis(4-N-methylthiosemicarbazone)-2,6-diacetylpyridine. The first pentacoordinate lead(<scp>ii</scp>) complex with a pentagonal geometry
作者:Rosa Pedrido、Manuel R. Bermejo、M. José Romero、Miguel Vázquez、Ana M. González-Noya、Marcelino Maneiro、M. Jesús Rodríguez、M. Isabel Fernández
DOI:10.1039/b416296j
日期:——
the electrochemical synthesis and characterization of new neutral manganese, iron, cobalt, nickel, copper, zinc, cadmium and lead complexes with the ligand bis(4-N-methylthiosemicarbazone)-2,6-diacetylpyridine, H4DAPTsz-Me. X-Ray structures of [Mn(H2DAPTsz-Me)(EtOH)2] 1, [Pb(H2DAPTsz-Me)] 3 and [Zn(H2DAPTsz-Me)]2·EtOH·2H2O 4, were also determined. In these complexes the ligand behaves as bis-deprotonated
The kinetics and the mechanism of oxidative decarboxylation of benzilic acid by acidic permanganate (stopped-flow technique) An autocatalytic study
作者:Sairabanu A Farokhi、Sharanappa T Nandibewoor
DOI:10.1139/v04-102
日期:2004.9.1
The kinetics of the oxidation of benzilic acid by potassium permanganate in an acidic medium were studied spectrophotometrically. The reaction followed a two-stage process, wherein both stages of the reaction followed first-order kinetics with respect to permanganate ion and benzilic acid. The rate of the reaction increased with an increase in acid concentration. Autocatalysis was observed by one of
Mass spectra of some bivalent transition-metal ion chelates with pyridylazo phenols and naphthols
作者:D. Betteridge、D. John
DOI:10.1016/0039-9140(68)80046-3
日期:1968.11
2- and 4-(2-pyridylazo)phenol, 2-(2-pyridylazo)-1- and 1-(2-pyridylazo)-2-naphthol and several chelates of these compounds with manganese(II), cobalt(II), nickel(II), copper(II) and zinc(II) are discussed. Comparisons are made with the results of solution studies of complex formation of the same chelates.