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Hexane solubility in salt water is minimal. But that small of volume of hexane is going to be tough to recover from 1 liter of water unless the water is clean. Any particulate will foul things up.

Is the problem with DCM that you don't want it in the lab? That is our solvent of choice for TPH-D extractions, although now it's just to elute disks.

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I have a 4 port setup for doing O&G using Environmental Express Gmm UltraFlow disks. What cat# or type of disk do you use for DRO?

If you don't have many samples I have done blow down by using 40ml voa vials to hold the solvent and using a needle attached to a line from a regulator or compressed air line to blow into the top of the vial. Hexane and DCM with both evaporate quickly doing that. You could also sit it in a beaker on a hotplate set at about 40C. Honestly the best hotplate to use is a cheap electric griddle from Wal Mart. We used those after we had a hood fire from arcing inside a Fisher hotplate when evaporating Hexane for oil and grease analysis. The electric griddles don't have exposed contact switches which can arc and are much less expensive than the explosion proof hotplates from the scientific suppliers.

Most of the extraction methods stipulate using 60ml of solvent in triplicate when doing 1L sepfunnel extractions, so you may not be getting the recovery you need from very dirty samples. The extraction would also be another option to not need to do blow down and to save on solvent usage. A 25ul injection can be done in a normal split/splitless injection port using CSR-LVI. There are plenty of papers available on Restek where one of their chemist has been working on large volume injections using normal injection ports for quite a while now, here is one link

Mineral oil would probably interfere with the DRO pattern especially the heavy hydrocarbon end of things.If you don't have many samples I have done blow down by using 40ml voa vials to hold the solvent and using a needle attached to a line from a regulator or compressed air line to blow into the top of the vial. Hexane and DCM with both evaporate quickly doing that. You could also sit it in a beaker on a hotplate set at about 40C. Honestly the best hotplate to use is a cheap electric griddle from Wal Mart. We used those after we had a hood fire from arcing inside a Fisher hotplate when evaporating Hexane for oil and grease analysis. The electric griddles don't have exposed contact switches which can arc and are much less expensive than the explosion proof hotplates from the scientific suppliers.Most of the extraction methods stipulate using 60ml of solvent in triplicate when doing 1L sepfunnel extractions, so you may not be getting the recovery you need from very dirty samples. The extraction would also be another option to not need to do blow down and to save on solvent usage. A 25ul injection can be done in a normal split/splitless injection port using CSR-LVI. There are plenty of papers available on Restek where one of their chemist has been working on large volume injections using normal injection ports for quite a while now, here is one link https://blog.restek.com/?p= the key is using a large enough guard column with the proper polarity deactivation layer and doing solvent focusing with the oven program. I have tried it and it works really well.

I well remember doing three 60mL DCM extractions for Pest PCB work back in the mid 's at my first envirionmental lab job. I "assumed" the 4mL method this lab was previously using was OK for DRO since it seemed to recover the spikes. But I want to get this lab method properly certified and produce the best possible data while using as little solvent as possible. So, I'm very interested in the extraction and larger injection volumes. I've been reading along on several others postings in the forum on . I am using a 1uL injection presently. I would guess from typical CRDL's of 10 ppm for soil and 0.2 ppm for water that might I do well enough using with a 20uL injection. I usually get only a few water DRO every few months. Most of my DRO sample load is for soils and I do a 20g extraction in a 40mL VOA with 10mL of 10% MeOH, 1mL o-terp surrogate in acetone, 20uL of the other two surrogates in pentane, and finally 4mL of Hexane. I put them on a rotator to get sample disagragated, followed by periodic shaking and ultrasonication in a high powered bath for an hour. Then centifugation and transfer to vial for analysis.

Recently I ran two water samples for which I received only a 2 oz jar for DRO and 2 40mL VOAs for the volatiles. I had been reading on this forum what others were doing. So, I did the microextraction but using only 32mL of water per replicate and 2mL of hexane. I got acceptable surrogate 86-113% and DRO 88-90% (after blank subtraction) spike recoveries. My MDL was about 6 mg/L.

I have a 4 port setup for doing O&G using Environmental Express Gmm UltraFlow disks. What cat# or type of disk do you use for DRO?I well remember doing three 60mL DCM extractions for Pest PCB work back in the mid 's at my first envirionmental lab job. I "assumed" the 4mL method this lab was previously using was OK for DRO since it seemed to recover the spikes. But I want to get this lab method properly certified and produce the best possible data while using as little solvent as possible. So, I'm very interested in the extraction and larger injection volumes. I've been reading along on several others postings in the forum on . I am using a 1uL injection presently. I would guess from typical CRDL's of 10 ppm for soil and 0.2 ppm for water that might I do well enough using with a 20uL injection. I usually get only a few water DRO every few months. Most of my DRO sample load is for soils and I do a 20g extraction in a 40mL VOA with 10mL of 10% MeOH, 1mL o-terp surrogate in acetone, 20uL of the other two surrogates in pentane, and finally 4mL of Hexane. I put them on a rotator to get sample disagragated, followed by periodic shaking and ultrasonication in a high powered bath for an hour. Then centifugation and transfer to vial for analysis.Recently I ran two water samples for which I received only a 2 oz jar for DRO and 2 40mL VOAs for the volatiles. I had been reading on this forum what others were doing. So, I did the microextraction but using only 32mL of water per replicate and 2mL of hexane. I got acceptable surrogate 86-113% and DRO 88-90% (after blank subtraction) spike recoveries. My MDL was about 6 mg/L.

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