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Urinary cobalt as a measure of exposure in the hard metal industry (1985)

Scansetti, G. ; Lamon, S. ; Talarico, S. ; [et al.]

Springer

International archives of occupational and environmental health 57 (1985), S. 19-26

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ISSN: 1432-1246

Keywords: Cobalt ; Urinary ; Ambient air ; Relationship

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary Twenty-six workers in a hard metal manufacturing plant were monitored by cobalt urinary and ambient air measurements during the first month after summer holidays. Cobalt determinations were performed utilizing AAS, with a preliminary chelation and extraction procedure for urinary samples. Almost all personal ambient air samples turned out to be under the cobalt dust TLV of 0.1 mg/m3. When restarting work after the holidays, urinary values did not differ from the control group. At the end of the first working week, urinary cobalt had increased four fold, then decreased to the original values on the following Monday before restarting work. Thereafter, the weekend was no longer sufficient to reduce the levels to normal urinary cobalt values. The values rose to the same level observed before the holidays, and dit not substantially decrease even after the weekend. End-shift urinary cobalt values showed a good relationship with present as well as with mean past exposure on the first and the fifth weekday, but the third day did not. The correlation was better with present exposure on Monday and with mean past exposure on Friday. The observed differences may be explained by the minor influence of recent exposure on present exposure on Monday. The highest values were found on Wednesday. We suggest the utilization of end-shift urinary cobalt determination as a measure of the present exposure on Monday, and of mean recent or preceding exposure on Friday.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00383542

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Some aspects of grid corrosion in the lead-acid batteries (1985)

Maja, M. ; Spinelli, P.

Weinheim [u.a.] : Wiley-Blackwell

Materials and Corrosion/Werkstoffe und Korrosion 36 (1985), S. 554-560

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ISSN: 0947-5117

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Description / Table of Contents: Einige Aspekte der Gitterkorrosion in BleiakkumulatorenDie Korrosion von Elektrodengittern mit und ohne Pastenauftrag ist für verschiedene Bleilegierungen gravimetrisch und elektrochemisch untersucht worden. Die mit Pasten beschichteten Gitter wurden nach mehrtägiger Verweilzeit in Schwefelsäure (1,10-1,32 g cm3) analysiert; zusätzlich wurden auch Gitter in verschiedenen Stadien der Gitterherstellung und aus unterschiedlich lange gelagerten Proben untersucht.Die Korrosion der Bleilegierungsbleche wurde mittels zyklischer Voltammetrie, linearer Voltammetrie, potentiostatischer Untersuchungen und durch Messen des Fotostromes untersucht. Die Ergebnisse zeigen die Bedeutung der Konversionsbehandlung der Platten auf die anschließende Korrosion der Gitter. Antimonhaltige Gitter scheinen stärker korrosionsanfällig zu sein, als solche mit Blei, Zinn und Calcium. Im Falle von Streckgittern wird durch die mechanische Verformung die örtliche Korrosion sehr begünstigt. Außerdem wird die Korrosionsanfälligkeit bei abnehmender Schwefelsäuredichte wesentlich größer. Die unterschiedlichen Ergebnisse der verschiedenen Prüfmethoden werden erörtert.

Notes: Corrosion of pasted and unpasted grids and of different lead alloys has been investigated by means of weight loss measurements and electrochemical tests. Pasted grids were analysed after several days immersion in sulphuric acid of different densities in the range 1.10-1.32 g cm-3. Some grids withdrawn from plates at various stages of manufacturing and from batteries stored for different times were also examined.Corrosion testing on lead-alloys sheet samples included cyclic voltammetry, linear sweep voltammetry, potentiostatic tests and photo-current measurements. The results evidenced the importance of the plates conversion process on subsequent corrosion of the grids. Antimonial grids appear to be more corrodible than lead-tin-calcium grids. Mechanical working greatly affects localized corrosion in the case of expanded grids. Corrodibility largely increases by decreasing the sulphuric acid density. Differences in the corrosion testing methods are discussed.

Additional Material: 10 Ill.