Increasing the concentration of 30% H2O2

[rwooduk]

Hi, I am in the process of calibrating our GC and one of the products we expect to find in our experiment is H2O2, but we only have 30% H2O2 in the lab. I can test 5% to 25% by dissolving further in water, so I can get some sort of calibration curve, but I'm stuck at 30%, is there a simple way to reduce the water content of the H2O2? I realize that H2O2 in more pure form can be quite dangerous but I can't find it in the
Illegal/Dangerous chemical activities thread, so I'm assuming its ok to ask this here.

Is there a safe limit? I am going to be injecting it into a GC, are there any precautions I should take?

Thanks in advance for any help.

 

[SteamKing]

Hi, I am in the process of calibrating our GC and one of the products we expect to find in our experiment is H2O2, but we only have 30% H2O2 in the lab. I can test 5% to 25% by dissolving further in water, so I can get some sort of calibration curve, but I'm stuck at 30%, is there a simple way to reduce the water content of the H2O2? I realize that H2O2 in more pure form can be quite dangerous but I can't find it in the
Illegal/Dangerous chemical activities thread, so I'm assuming its ok to ask this here.

Is there a safe limit? I am going to be injecting it into a GC, are there any precautions I should take?

Thanks in advance for any help.

You can find what is called "high-test peroxide" from some vendors, but this stuff is basically rocket fuel and you may not be able to purchase it off the street without authorization.

Food-grade peroxide goes to 35% concentration. Buying anything with higher concentration could get you put on a TSA watchlist for people sniffing around sensitive chemicals.

You also shouldn't try to distill a lower concentration peroxide to a higher concentration becuz all the oxygen is a fire hazard and this stuff is dangerous to sensitive tissues, like your eyeballs. People who work with high concentration peroxide should be wearing their HAZMAT suits to prevent exposure.

https://en.wikipedia.org/wiki/High-test_peroxide

 

[rwooduk]

You can find what is called "high-test peroxide" from some vendors, but this stuff is basically rocket fuel and you may not be able to purchase it off the street without authorization.

Food-grade peroxide goes to 35% concentration. Buying anything with higher concentration could get you put on a TSA watchlist for people sniffing around sensitive chemicals.

You also shouldn't try to distill a lower concentration peroxide to a higher concentration becuz all the oxygen is a fire hazard and this stuff is dangerous to sensitive tissues, like your eyeballs. People who work with high concentration peroxide should be wearing their HAZMAT suits to prevent exposure.

https://en.wikipedia.org/wiki/High-test_peroxide

Hi, thanks very much for the info! I've read some of the wiki article it seems quite hazardous, think I will forgo trying to make the stuff and discuss with my supervisor about getting some from a supplier. Thanks again.

 

[Kevin McHugh]

Why don't you dilute your samples to fall within the 30% range? A very simple solution (pun intended) to your problem.

 

[Borek]

Why don't you dilute your samples to fall within the 30% range? A very simple solution (pun intended) to your problem.

OP wants to extend the calibration to concentrations over 30%, and 30% is the starting material. I don't see how dilution applies.

 

[Kevin McHugh]

OP wants to extend the calibration to concentrations over 30%, and 30% is the starting material. I don't see how dilution applies.

He can dilute his unknown samples down to fall with the max 30% H2O2 limit. If his samples are on the order of 60%, a 1:3 dilution puts him right at 15% hydrogen peroxide, right in the middle of the calibration curve.

 

[Borek]

Ah OK, you mean diluting the samples during the analysis, not the ones used for the calibration curve preparation. I misread your post.

 

[DrDu]

I think you can increase the concentration freezing out some of the water.

 

[DrDu]

Have a look here: Pages 156 pp
https://www.scribd.com/doc/38643764...er-Praparativen-Anorganischen-Chemie-BAND-1-3

 

[Kevin McHugh]

I think you can increase the concentration freezing out some of the water.

Dilution of the samples is so much easier.

 

[DrDu]

Dilution of the samples is so much easier.

Admittedly!