Diamond Environmental Ltd is an occupational hygiene consultancy and a leading provider of BOHS modules and other occupational hygiene training courses.  We’re based in the north of England but are prepared to travel (almost!) anywhere.

All our staff are professionally qualified and have experience in a wide range of industries. We also have an excellent reputation for quality and service –  and the best bit is we are friendly too!


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  1. I read your article with interest as we have a reconstructed lighthouse at our museum on Kangaroo Island, Australia. It is a Chance Brothers of Birmingham light which floats on a bed of mercury. We are thinking of opening up the bottom of the lighthouse construction to allow visitors to see the weighted mechanism and to read about the history of the light. They will be about 4 metres below the lenses and mercury bath. Do you see any danger in allowing people into the lower area in terms of the mercury. We assume the longest anyone would be in the area would be possibly five minutes.

    • Hi Dean

      It’s difficult to give you a definitive response without being able to see the installation in-situ . I’m also not certain from your comment whether the mercury will be exposed or contained within the bath. I expect that the risk will be low as appears that visitors will be some distance away. Also mercury mainly presents a chronic (long term) risk to health due to prolonged and repeated exposures. I would expect your visitors will be exposed to relatively low concentrations for a short period of time on a one off basis. The main concern would be to your staff if there were elevated levels in the vicinity of the bath and they had repeated exposures. I’d recommend carrying out a risk assessment. A qualified occupational hygienist would be the best person to do this for you (contact the Australian Institute of Occupational Hygienists http://www.aioh.org.au/index.aspx if you need to find one). Alternatively you could try carrying out some measurements yourself – you’ll probably be able to hire a direct reading meter. However if you do this you need to be very careful interpreting the results. A qualified occupational hygienist would be able to offer advice.

      Hope this helps


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