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Occlusion Plating with Nickel. Codeposition of Titanium Dioxide Particles.
The following bath was used to electrodeposit the hard composite of Ni with TiO2. NiSO4 250, NiCl1 30, H2BO3 40, TiO2 100 g/l. at pH 4-4.5, 60-65. degree, and 4.66 A/dm2. This composite had high-tensile strength, low porosity and better corrosion resistance than pure Ni. The effects were studied of TiO2 concn. c.d., pH, time and heat treatment on the electrodeposited composited.
Occupational Asthma Caused by Palladium.
Occupational exposure to complex platinum salts is a well-known cause of occupational asthma, although there is evidence that platinum refinery workers may also be sensitized to other precious metals, such as palladium or rhodium, no instances of occupational asthma due to an isolated sensitization to palladium have been reported. A case is reported of occupational rhinoconjunctivitis and asthma in a previously healthy worker exposed to the fumes of an electroplating bath containing palladium. There was no exposure to platinum. Sensitization to palladium was documented by skin-price tests, the skin-price test was positive with Pd(NH3)(4)Cl-2, but not with (NH4)(2)PdCl4. Corresponding salts of platinum were all negative, a bronchial provocation test with Pd(NH3)(4)Cl-2(0.0001% for a total of 315 s, followed by 0.001% for a total of 210 s) led to an early decrease in forced expiratory volume in one second (-35%). A similar exposure (0.001% for a total of 16 min) in an unrelated asthmatic gave no reaction. This case shows that an isolated sensitization to palladium can occur and that respiratory exposure to palladium is a novel cause of metal-induced occupational asthma.
Occupational Asthma in Metal Finishing
Guidance sheets on occupational asthma caused by inhalation of hexavalent chromium, nickel and cadmium mists. Guidance based on research by the Health and Safety Executive (HSE) and the Surface Engineering Association (S E A). These can be found at: www.hse.gov.uk/surfaceengineering/occupational-asthma-mists.htm
Occupational asthma in metal finishing
Guidance note on occupational asthma as caused by inhalation of hexavalent chromium, nickel and cadmium mists esp. in metal finishing
Occupational contact dermatitis in electroplating industry - Result of a field study
Occupational exposure & environmental emissions from nickel plating
Based on a sample of UK nickel platers, data is presented broken down by process type (rack, barrel, bright, dull etc) and emissions to air, water & effluent & to land. 7 refs
Occupational Hazard for Painters
To be published in the Monograph Series in 2008.. Results of a survey indicating significant carcinogenic danger to painters. A prev. study was published in Monograph 47 (1989). A pamphlet from the University of Kentucky, dated 8 Jan 2008 notes hazards from trichloroethylene, apparently interfereing with dopamine transport and thus causing Parkinson type symptoms.
Occupational Inhalation Exposures During Hot-Dip Galvanizing
Surveys short-term and longer-term effects, nature of zinc dust and conditions which affect it. Particle size analysis, dustiness meas'ts, UK statistical database are discussed. pH effects of Zn dust are tabulated. Prev. work is shown, with breakdown of pickling & galvanising processes.
Occupational Noise & Hearing Conservation
Outline of US procedures required by management in terms of health & safety at work.
Occupational Toxicants: Critical Data Evaluation for MAK Values & Classification of Carcinogens. Vol. 20
ISBN 3527-27797-8. Brings together 400 documents used to assess toxicity and and so derive workplace concentration safe limits.
Occurrence of pitting sites of aluminium electrolytic capacitor electrode by applying cathodic current
In etching Al electrolytic capacitors, high purity (99.99%) Al was galvanostatically electrolyzed at -800 mA/sq.cm for 20 s in 1. 0% NaCl soln. containing HCl and alumina powders, and pitting sites were produced at density of 1.4 x 10E12/sq.m on surface.
Octamethyl cyclotetrasiloxane azeotropes
Odour emissions from paint shops - the legal position.
German legislation governing odour emissions from paint shops is set out. Concepts such as time length of such emissions, number of days a year etc are subject to this legislation. Notes that confusion often exists between VOC emissions and odour emissions. The two may be linked but are in law quite separate. (Article is part of an ongoing series from Braunschweiger Umwelt Biotechnologie GmbH, www.bub-umwelt.de ) which offers biological solutions to such problems.
Odour emissions: Part 5
Three check lists are shown, one for complainants, a second reporting weather conditions and a third reporting operations within the plant. The use of these is described. www.bub-umwelt.de
Odour emissions: Part 6. VOC guidelines
Part 6 examines VOC emissions as related to odour emissions with a table setting out German legislation. Three main categories apply to operations using less than 5 tonne p.a, from 5 to 15t p.a and greater than 15t p.a Deadlines for modernising within each category are noted.