After cleaning there is usually still a few marks where the Cu was in contact with the tube (these turn the HCl a very feint green colour), also sometimes some adherent flecks of Qtz wool, so it's partly cosmetic and partly to ensure no random particles that could get in the way of making a good seal at top or base when next used.
Dr Ian Boomer
Course Director MSc Appl. & Pet. Micropalaeontology
School of Geography, Earth & Environmental Sciences,
University of Birmingham,
Edgbaston, Birmingham B15 2TT
Tel: 0121 4145536 (office) 0121 4142866 (lab)
From: Stable Isotope Geochemistry [mailto:[log in to unmask]] On Behalf Of Marilyn Fogel
Sent: 15 January 2016 14:33
To: [log in to unmask]
Subject: Re: [ISOGEOCHEM] Removing reduced copper
Can you guys tell us why you soak the quartz tube in HCl overnight or with a rinse? Is there a residue that you see on the tube that you are removing?
Dr. Marilyn L. Fogel, Professor of Ecology Chair, Life and Environmental Sciences Unit Faculty Director, Environmental Analytical Laboratory President, AGU Biogeosciences School of Natural Sciences University of California at Merced
5200 Lake Rd., Merced California 95343
On 1/15/16, 4:22 AM, "Stable Isotope Geochemistry on behalf of Ian Boomer"
<[log in to unmask] on behalf of [log in to unmask]> wrote:
>On wide diameter Elementar tubes we use a length of 1/4" SS tube
>(handle on one end made of Duct tape) to 'grind' out the CuO, you might
>need some wire with hook-end to remove glass wool. Same should work on
>narrower tubes but you might want workshop to make up a small serrated
>grinding-end to the SST.
>Then an overnight soak in 0.5% HCl and good as new. We reuse constantly.
>Dr Ian Boomer
>Course Director MSc Appl. & Pet. Micropalaeontology School of
>Geography, Earth & Environmental Sciences, University of Birmingham,
>Edgbaston, Birmingham B15 2TT
>Tel: 0121 4145536 (office) 0121 4142866 (lab)
>From: Stable Isotope Geochemistry [mailto:[log in to unmask]] On
>Behalf Of GROCKE D.R.
>Sent: 15 January 2016 12:13
>To: [log in to unmask]
>Subject: [ISOGEOCHEM] Removing reduced copper
>just a quick question in the hope of saving costs:
>does anyone know an easy way to remove the oxidised copper from the
>quartz column; so that the quartz column can be re-used?