AvBaeyer
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UV lamp for TLC visualization
I am in need of short and long wavelenght uv light for TLC visualization. I have seen some hand held units aimed at rock collectors which have either
short or long wavelength capability for pretty good prices, usually under $40. Does anyone have any experience with these types of units or any
suggestions for modestly priced uv sources to meet my needs? I am well aquainted with the high end hand held units but I do not want to spend that
much money. Any help will be greatly appreciated.
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bfesser
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I have a <a href="http://www.uvp.com/compactlamps.html" target="_blank">UVG-11 from UVP Inc.</a> <img src="../scipics/_wiki.png" />,
that I'm very happy with. I purchased it 'used' (like new) from eBay some years ago, and paid only 40 (USD) or so including shipping. It's been
perfect both for visualizing TLC plates and my mineralogy interest. The UVG-11's a 254 nm ('short wave') model, but they make dual wavelength and
long wavelength models, as well. You can also get cabinets that work with these lamps which are ideal for analyzing TLC plates.
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AvBaeyer
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Bfesser,
Thank you for the reply. I will continue to look for a reasonably priced unit such as the ones you describe as I am quite familair with these. In the
meantime, do you know anything about the battery powered uv lights that have about 4 watts or so of power? These can be had for $10-$30 depending on
"features". Some have 254 nm capability by use of a filter.
AvB
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chemrox
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I also got a handheld unit for $40 on ebay. It is great for visulaizing TLC plates. I2 vapor also works for the stuff Im looking at. I cut my TLC
plates at the glass shop to 1-2" width and visualize them in a square vase with a saw cut and sanded top with a square piece of window glass to hold
the vapor. On a cold day I put it on a hot plate for a few. The I2 is in two 5 ml beakers inside. The iodine sublimates a bit on the hot plate.
This makes for really nice vapor.
"When you let the dumbasses vote you end up with populism followed by autocracy and getting back is a bitch." Plato (sort of)
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AvBaeyer
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I also use iodine in general as well as some dips but recently I have found the need to use uv visualization. I use commercial 1in x 3in or 2in x 3in
plates and run them in some properly sized jars with polyethylene lined caps. The iodine is in the bottom of a similar jar. Problem is, not everything
stains with iodine and the use of dips is messy and can make for nasty fumes if they need to be heated.
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packetforger
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You could easily build one from a bunch of LED's bought from Digikey or similar. That way you can select the wavelength required when buying the
LED's. A quick bit of soldering practice, a sheet of perfboard, and away you go.
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bfesser
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Workable shortwave UV LEDs—254 nm is ideal—are prohibitively expensive, packetforger. Better off just buying a
Hg tube-based device.
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AvBaeyer
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Thanks all. I think the problem is being solved.
AvB
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packetforger
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bfesser - sadly true. I spent the rest of the night after that post actually shopping for ones in the right wavelength  I made the mistake of assuming any would do and greatly apologise for that.
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smaerd
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I made one of these for around 20 dollars. Used a 254nm reptile light/pet light(I think), a G23 bulb base, a hacked off power cord, some twist
connectors, and I believe a magnetic starter. Haven't created a reflector for it yet but it should be easily done with a piece of sheet metal or
similar. Of course it's not only 254nm but it works pretty well.
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bfesser
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As far as I'm aware, reptile lamps are primarily UVA (400 – 315 nm, 'long wave') and UVB (315 – 280 nm, 'medium wave'). The TLC plates I have
used fluoresce with excitation at 254 nm, which is UVC (280 – 100 nm, 'short wave'). I don't think your device will be particularly effective.
ref: http://en.wikipedia.org/wiki/Ultraviolet
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smaerd
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It's definitely 254nm. My apologies it is a UV sterilization lamp. I had looked at reptile lamps when building it but there are reptile lamps that do
hit 254nm. They were about 20 dollars a bulb though.
After looking up the model number, this is an equivalent bulb - http://www.creatorlighting.com/index.php?a=show&m=Produc...
My 'device' is particularly effective... A student borrowed it for his research last semester.
[Edited on 9-3-2014 by smaerd]
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smaerd
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Forgot to post pictures of my lamp. Now that my camera is working again 
if anyone wants to know how it was wired or the components I can share that.
 
[Edited on 17-1-2015 by smaerd]
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DJF90
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For those in the UK, you can buy a counterfeit money detector from Maplin (http://www.maplin.co.uk/p/professional-3-tube-money-detector...). This is an updated model to the one I purchased a couple of years ago, which
came with a blacklight bulb which is typical for long wave detection (365 nm ish...). This new model claims to have two UV bulbs and a white bulb
also, so perhaps it already has detection at 254nm also. Otherwise, I purchased a 4W germicidal bulb on ebay that will fitted my lamp, allowing
detection for plates using a 254nm fluorescent material.
Be careful not to look directly at the UV tube though, unless you want to suffer from "arc eye".
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ledob86
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Thellia.fr
Materials from french supplier : thellia.fr (google is your friend, right click and translate > buy > build > play)
assemble this with a tuperware (tubes inside and matchbox oustise), cover it with something black, let a little window and seal the lid with something
efficient.
Lampe UVC, (254nm) >> IN SEALED AREA WHILE WORKING !
http://lampe.thellia.com/19-tuv-8w-8711500623683.html
Lampe UVA (~365nm)
http://lampe.thellia.com/52-actinique-bl-8w-10-fam-871150026...
Ballast,
http://lampe.thellia.com/142-hf-matchbox-red-109-sh-tl-pl-s-...
Douille,
http://lampe.thellia.com/322-douille-g5.html
Support,
http://lampe.thellia.com/323-support-lampe-t5.html
[Edited on 25-5-2015 by ledob86]
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Mush
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This piece well worth it. I've been searching for similar uv lamp for a while.
https://www.aliexpress.com/item/Qi-Wei-ZF-1-three-UV-analyze...
(Qi Wei) ZF-1 three UV analyzer with UV lamp / desktop 254/365nm
A,ZF-1Table three UV analyzer features
ZF-1Table three UV analyzer is one of our company 's ultraviolet instrument products can emit long wave ultraviolet365nmHigh intensity, good
stability, easy to use, reliable, welcomed by the majority of users.ZF-1Table three UV analyzer is widely used in scientific research, production and
other fields.
1In biochemistry and medicineDNA,RNAElectrophoresis gel samples were observed and analyzed.
2And in the pharmaceutical industry, the quality of the drug can be used to check hormone alkaloids, vitamins can produce fluorescence, especially
suitable for thin layer chromatography, paper layer analysis and testing.
3In the chemical industry, dyestuff industry, be able to identify different types of crude oil and rubber products, the determination of a variety of
fluorescent material, fluorescent indicator, additives etc..
4In the textile industry can be used to identify cotton, synthetic fiber, silk artificial fiber, wool and other raw materials.
5In the food industry can be used to detect aflatoxin, food additives, as well as food, vegetables, fruits, cocoa butter, sugar, eggs and other
quality.
6In the * * Department can be used for forensic identification and other occasions.
Two,ZF-1Table three main technical performance of UV analyzer
1UV wavelength: short wavelength UV wavelength254nm
Long wave UV peak365nm
2Power supply:AC220V + 10%50HZ
3Power: short wave ultraviolet:6W Long wave ultraviolet:6W Visiblelight:4W
4And the size of UV filter glass:200 x 50mm
Power: 18W
US $140.22 -178.75
https://www.aliexpress.com/item/UV-detection-lamp-hand-held-...
Some other alternatives:
UV detection lamp hand held UV analyzer 254nm 365nm wavelength UV 110V or 220V
US $244.00
2 in 1 LW + SW 365nm 254nm Ultraviolet UV Lamp for Fluorescent Minerals Currency
US $278.00
https://www.ebay.com/itm/2-in-1-LW-SW-365nm-254nm-Ultraviole...
Portable UV Lamp 365nm/254nm Ultraviolet Analyzer High Sensitivity UV Analyzer Lab Equipment For Biology Scientific Research
https://www.aliexpress.com/item/Portable-UV-Lamp-365nm-254nm...
US $96.00
[Edited on 6-12-2018 by Mush]
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S.C. Wack
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A battery power item sold for rocks that either emits 254 or is represented fraudulently: https://www.amazon.com/dp/B07B4K87XG
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