You can use tartaric acid and zinc powder and it goes more slowly and controllably. Instead of burning it against a cold dish, you can use a solution of mercuric bromide (white solid) which will turn various shades of yellow and brown.
How reliable that test is? I am more interested in qualitative then quantitative test. I used some wood and I want to be sure that is not Arsenic treated. Test you are describing showed twice negative.
It very reliable, there are commercial kits which use that method. I've checked them against lab results and they are semi-quantitative., We had the test kit showing 30-50 ppb and when the lab results came in they were 40.5 and 39.1 ppb which is god enough. The advantage that you have a result in about 20 minutes instead of several days.
How did you protect yourself against the insidious poisons AsH3 and As4O6 that are formed during the test? I'm asking as it doesn't look like you're using a fume hood.
I've got a large window, that serves as a door next to the table and I sometimes use it similar to a fume hood, if I need one. I keep it as close as possible and the fumes are blown away by the wind. It works quite well, even though it might look pretty strange :D
+Random Experiments Int. - Experiments and syntheses I have one question that I wonder if you can answer: If glycerin is a viscous liquid in nature then how is it possible to make it solid at room temperature?
This exact method might only be able to detect arsenic in the stomach after ingesting a deadly single dose. I'd say to detect smaller traces the method has to be changed a bit, by decomposing large amounts of the gas in a tube. You can see the setup here: de.m.wikipedia.org/wiki/Marshsche_Probe#/media/Datei%3AMarsh_test_apparatus.jpg
When metals are dissolved in HCl you often have traces of compounds of phosphorus and sulfur in the hydrogen gas. They smell like garlic and rotten eggs.
I was reading about this in a book and was a little confused. This cleared things up for me!!Thank you!
An excellent, comprehensive video. Well done!
You can use tartaric acid and zinc powder and it goes more slowly and controllably. Instead of burning it against a cold dish, you can use a solution of mercuric bromide (white solid) which will turn various shades of yellow and brown.
How reliable that test is? I am more interested in qualitative then quantitative test. I used some wood and I want to be sure that is not Arsenic treated. Test you are describing showed twice negative.
It very reliable, there are commercial kits which use that method. I've checked them against lab results and they are semi-quantitative., We had the test kit showing 30-50 ppb and when the lab results came in they were 40.5 and 39.1 ppb which is god enough. The advantage that you have a result in about 20 minutes instead of several days.
@@karhukivi Thanks for answer, mine was twice negative so I hope that is really negative.
Thank you for the video! But why powder zinc cannot be used?
It would react very quickly and cause a lot of foaming which would cause the mixture to shoot out of the tube.
How did you protect yourself against the insidious poisons AsH3 and As4O6 that are formed during the test? I'm asking as it doesn't look like you're using a fume hood.
I've got a large window, that serves as a door next to the table and I sometimes use it similar to a fume hood, if I need one. I keep it as close as possible and the fumes are blown away by the wind. It works quite well, even though it might look pretty strange :D
+Random Experiments Int. - Experiments and syntheses I have one question that I wonder if you can answer: If glycerin is a viscous liquid in nature then how is it possible to make it solid at room temperature?
The amount is pathetic, can't hurt you unless you keep sniffing it for hours.
What does it look like?
how sensitive is this test? if it gives no result does that mean there's no toxic levels of arsenic?
This exact method might only be able to detect arsenic in the stomach after ingesting a deadly single dose. I'd say
to detect smaller traces the method has to be changed a bit, by decomposing large amounts of the gas in a tube. You can see the setup here: de.m.wikipedia.org/wiki/Marshsche_Probe#/media/Datei%3AMarsh_test_apparatus.jpg
loved it✌
Decomposition of realgar DOES NOT form orpiment. It forms another mineral, PARAREALGAR.
I think I did this by accident and breathed it in .
Put some steel boldts in HCL and realized some weird smell.
Hope I dont die 😢
When metals are dissolved in HCl you often have traces of compounds of phosphorus and sulfur in the hydrogen gas. They smell like garlic and rotten eggs.
:)