teodor
National Hazard
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Registered: 28-6-2019
Location: Heerenveen
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test strips/device to detect phosgene
I'd like to have such test strips to make sure I am safe when making experiments wich use chlorinated hydrocarbons like CCl4, CHCl3, CH2Cl2, C2H2Cl4.
I know they exist and I found the article https://doi.org/10.1039/C7CC05313D which has a good review of other articles & compounds which can be used to make them.
Does anybody know any supplier which sells such strips?
I plan to use them inside a fume hood so they can have lower sensitivity compared with what is needed to test the air in the laboratory space.
I also can consider an electronic device if it is not VERY expensive.
I understand that it is not what everybody absolutely needs but just something which can make me more comfortable when working with some group of
compounds.
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unionised
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Does this help?
https://en.wikipedia.org/wiki/Chloroform#Conversion_to_phosg...
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Plunkett
Hazard to Self
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Have you looked at Dräger tubes? Dräger Tubes are glass vials filled with a chemical reagent that reacts to a specific chemical or family of
chemicals. A calibrated 100 ml sample of air is drawn through the tube. If the targeted chemical(s) is present the reagent in the tube changes color
and the length of the color change typically indicates the measured concentration. They are a bit pricey for the hobbyist.
https://www.gasdetectionwarehouse.com/draeger-gas-detector-t...
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teodor
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diphenylamine + dimethylaminobenzaldehyde method is not specific to phosgene as far as I know. Being probably a good method to test pure chloroform
(because you have either pure chloroform or pure chloroform with phosgene) it doesn't necessarily suitable for air testing which can contain NOx, SOx,
O3, organic and inorganic acids etc.
Quote: Originally posted by Plunkett  | Have you looked at Dräger tubes? Dräger Tubes are glass vials filled with a chemical reagent that reacts to a specific chemical or family of
chemicals. A calibrated 100 ml sample of air is drawn through the tube. If the targeted chemical(s) is present the reagent in the tube changes color
and the length of the color change typically indicates the measured concentration. They are a bit pricey for the hobbyist.
https://www.gasdetectionwarehouse.com/draeger-gas-detector-t... |
It would not be expensive if could be used for prolonged testing mode, like several days or at least several hours pumping the air through it, but I
am afraid these devices can be used only once with 100ml of air and then require replacing.
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BromicAcid
International Hazard
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This is what we use at work
https://dodtec.com/phosgene-3-day-badge-without-control-wind...
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teodor
National Hazard
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Location: Heerenveen
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Looks interesting. How fast I can expect the color change at the dangerous level?
I checked the site and it costs $114 to send to the Netherlands. More than the price of the pack of 50 badges. Inside US the shipping cost is around
$11.
So, if somebody who lives in US is interested in the group buy (can get and send me a part of the pack by usual post) please let me know. While I will
look to other alternatives.
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BromicAcid
International Hazard
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Change is rapid, carbonyl chlorides/ chloroformates / chlorothiolformates all give interference results (slightly different colors). I used them for
years before moving to a different part of the company so I was pretty good at determining exposure by looking at the intensity of the red dot but
they also have a chart correlating to dose. The badges themselves seem reasonably priced but you're right - shipping is killer.
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