Michael

I had a lot of experience with this at TRL. The problem is that the LoD of the analysers is indeed above the limit value. The only lab test is using flame photometry which is not sensitive enough.  In the UK the Environment Agency recommend a factor which assumes (a very high) proportion of the Cr is CrVI. You may have to accept that some things are not possible.



By the way, since April 1st I have been employed full-time by Campbell Associates representing Aeroqual Air Quality Monitoring sensor systems in the UK so I am back to the subject I know and love. Contaminated Land has been interesting and the QROS equipment is an incredibly useful tool but the Aeroqual AQY is the right product at the right time. I will therefore be leaving the Cont Land Jisc mail shortly but please feel free to contact me as below.[Peter Fleming]  I will, of course, still be on AQ Jisc Mail.



Best regards



Peter Fleming

Air Quality Specialist

Mobile and WhatsApp: +44 7958 205920

Skype:   petermfleming

Email:    [log in to unmask]

[Peter Fleming] 



Campbell Associates Ltd

Sonitus House, Unit 5 Chelmsford Road Industrial Estate, Great Dunmow, Essex, CM6 1HD Tel +44 (0) 1371 871030 Fax +44 (0) 1371 879106 www.campbell-associates.co.uk







Company registered in England number 03700715 Registered Office: 12 Alma Square, Scarborough, North Yorks, YO11 1JU 



-----Original Message-----

From: Air quality <[log in to unmask]> On Behalf Of M Sylvester

Sent: 17 April 2019 16:53

To: [log in to unmask]

Subject: Cr (VI) Ambient Air Quality Monitoring



I'm hoping somebody might have a good idea how to sort out a little problem.



We need to undertake some ambient air quality monitoring for a permitted industrial site in the northeast. The site surface treats metals using solutions containing Cr (VI). The process baths are lip extracted to atmosphere (for H&S reasons).



This all sounds easy, but the issue is the Environmental Assessment Level for Cr (VI) has been considerably reduced since the permit was issued:



•	H1 Guidance (2003) – Cr VI Long-term EAL 0.1 µg/m3

•	H1 Guidance (2008) – Cr VI Long-term EAL 0.1 µg/m3

•	Air emissions risk assessment (2018) - Chromium VI, oxidation state in the PM10 fraction – Long-term EAL 0.0002 µg/m3



At the current time the UK Heavy Metals Network undertake monitoring for Cr (total) but don’t speciate for Cr (VI). I’ve contacted NPL who run the UK Heavy Metals Network for Defra and they can’t help with Cr (VI) and can’t see how we can estimate Cr (VI) from a Cr (total) assessment. All the other labs are struggling with the LoD. The output from the monitoring will be used within a revised environmental assessment/dispersion model.



Any ideas who could undertake an ambient air Cr (VI) analysis (ng/m3 range)?? Any thoughts are appreciated?



Michael Sylvester

Manager



Earth & Marine Environmental Consultants Ltd UK ǀ Romania ǀ Iraq ǀ Kurdistan Region of Iraq ǀ Guyana



Address: 7th Floor, West One, Forth Banks, Newcastle Upon Tyne, NE1 3PA, UK

Office: +44 (0)800 130 3408

Mobile: +44 (0)7934 788293

Email: [log in to unmask]



www.eame.co.uk



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