Good suggestion regarding iron nails to remove Cu+ before disposal. With
autoclaving, re-use is easy though; worth considering. Also helps
dissolve the salt, which is sometimes annoyingly time-consuming.
On 24/04/12 18:11, Simon Quellen Field wrote:
> By the way, copper sulfate sounds better than my hydrogen peroxide idea,
> because you can tell the solution is still strong just by looking at it.
> And the copper sulfate vapor will be insignificant.
>
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> On Tue, Apr 24, 2012 at 10:09 AM, Simon Quellen Field <sfield@scitoys.com>wrote:
>
>> Add some aluminum foil or steel nails to the copper sulfate solution.
>> The copper will plate out onto the more reactive metal.
>> The blue color goes away.
>> The iron sulfate or aluminum sulfate that remains in solution is not
>> harmful to wildlife in your sewer system.
>>
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>> On Tue, Apr 24, 2012 at 1:11 AM, Cathal Garvey <cathalgarvey@gmail.com>wrote:
>>
>>> If you look up how HEPA filters tend to work, it's not actually by size
>>> exclusion. Instead, the filters are engineered to attract and adsorb
>>> particles as they pass through the mesh. So, the filter "pore" size
>>> isn't so small as to impede flow. The disadvantage though is that you
>>> can't just back-flush the filter to re-use it; adsorbed
>>> dirt/spores/viruses are there to stay, more or less.
>>>
>>> As to humidity control; I won't get into the mechanics, because it's not
>>> something I know a great deal about. But, a cheap hack to avoid standing
>>> water from getting contaminated is to add 1g/L CuSO4.7H20 (Blue Copper
>>> Sulphate) to the water. Copper Sulphate is a pretty effective biocide,
>>> so this tends to prevent anything growing in it.
>>>
>>> However, reading through MSDSs one day, I discovered that copper
>>> sulphate is considered "extremely toxic to the aquatic environment"; try
>>> to avoid washing it down the sink. Just let it dry out and re-use if
>>> possible after autoclaving.
>>>
>>> On 24/04/12 04:20, Daniel C. wrote:
>>>> On Mon, Apr 23, 2012 at 11:03 PM, Simon Quellen Field
>>>> <sfield@scitoys.com> wrote:
>>>>> If we build the other device I was talking about, where we create air
>>> that
>>>>> has the temperature and humidity we like, and then blow it through a
>>>>> virus filter, we can also use a wet bulb hygrometer, since it is on the
>>>>> non-sterile side of the filter.
>>>>
>>>> I've heard about filtering things to sterilize them a few times
>>>> recently... is this a new thing? I don't recall it being possible to
>>>> do this when I worked in a lab way back when, but maybe it was and I
>>>> just never did it (or forgot). It seems like any filter small enough
>>>> to get viruses out would also impede airflow so much that you'd need a
>>>> tremendous pressure differential to get any throughput.
>>>>
>>>> -Dan
>>>>
>>>
>>>
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