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Re: Mercury dispenser
Posted By: SVP Neon Equipment In Response To: Re: Mercury dispenser (Dana)
Date: Tuesday, 24 October 2006, at 12:52 p.m.
> Honestly, besides Mark's, I have only seen
> the rather large metal injector from
> EGL-which looks like a dangerously breakable
> contraption from the outside-never used one
> so that is only from pictures.> Glass is no doubt best, but concerns with
> glass-not from the contamination issue-is
> having it hit the floor-another reason to
> carpet the shop.> I would believe that Mark's would outperform
> anything else.> A shop should probably have not only one
> dispenser but two in case one quits.Good thread! And thanks for the props GB. Glad you like the new design. I wish I would have thought of it 5 years ago! :-|
I have to agree with the points GB brought up about using glass over anything else to contain and store your mercury in. But even with glass, you have to be careful of which type of glass is used. Soft glass (particularly lead glass, but other soft glasses as well), have been known to react to some extent with mercury. So using an el-cheapo glass syringe from the corner drug store is not the best thing to do. Other than fused quartz, borosilicate is the least reactive glass and works very well for storing mercury.
Yes, you can use a high purity polyethylene bottle. One respected mercury distiller offers mercury in such a bottle for their instrument grade mercury, but still uses glass bottles for their highest grade of mercury.
If the polyethylene bottle could be fitted with some type of needle that is not reactive with mercury (even stainless steel is over long periods of time) it may be usable. But I think it would lack control over the amount of mercury dispensed and may present other problems as well.
Yes, if you drop a glass injector full of mercury on a concrete floor it will probably break. But then, if you drop a mercury unit on the floor it will surly break. Same for the Masonlite Quicksilver electrodes. Nothing is fool-proof.
Other than accidentally dropping it on the floor, I'm not sure why you would need two injectors. The biggest problem is people not following instructions and not lightly fire polishing the end of the tubulation. It only takes a couple of seconds with a hot set of fires to do. It doesn't have to be anything real pretty, just enough to knock the sharp edge off the glass so it doesn't cut into the flexible Teflon needle when you slide it thru the tubulation and into the mercury trap. But if you really think you need two please don't let me stop you - LOL!
Mark
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