Rick is correct the HT furnace is different then standard furnace. I am assuming you are using the standard furnace. That is the furnace used for NC in the Flash HT configuration. I assume that because that is how it should have been installed. If you are using the HT furnace then move tube to the other side. If it is on the correct side then try my last post.

Mike Elefante, President
Elf Analytical Services, Inc

-----Original Message-----
From: NaiJung Wan <[log in to unmask]>
To: ISOGEOCHEM <[log in to unmask]>
Sent: Fri, Jan 6, 2017 2:36 am
Subject: Re: [ISOGEOCHEM] Questions about Flash HT plus configurations

Hi Mike

Thanks for your suggestion and happy new year. I has repeated the experiments under 900C with the car. flow at 100 and 80, and oxy. flow at 250 x 3sec and 150 x 3sec individually. The shoulder on mass 30 still existed.

We used the packed collumn from EMA - X1151, and we use the quartz inner tube for collecting ash.
The chemical packed setting of the collumn (from bottom to top):

quartz wool x 2cm
cobaltous/ic oxide silvered granular x 5 cm
copper wires x 10 cm
quartz wool x1 cm
chromium oxide x 5 cm
quartz wool x1 cm

The height from the tube bottom to the copper top is 17 cm. It's over too much to your suggestion -- 12cm. Temperature might be still too high for upper copper and couse the top copper melting when flash happened. I guess that I need to reduce some oxide silvered granular and and copper in order to satisfy your suggestion. I will try the experiment again by using the self packing reactor and will let your know the result.