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I'm new and possibly confused. Does each user get their own article? This can't be right... I see now, I get a talk page... I'll just continue to talk to myself then.. ok I'm bored. later skater.
Hi Ryan. I've just been going through some of my pages and I noticed (finally) that you removed some text I'd written re: alkalinity on the solubility pump page. Although I do deal in alkalinity now and again (I'm a biogeochemical modeller), it's to the edge of my comfort zone, and I'd imagine you're much more of an expert than I am on it. Anyway, I've added the bit you excised again because I'd like to say something about what alkalinity actually is on top of introducing TCO2, TALK, pH and pCO2 for a measurement prespective on things. Just wanted to let you know in case you're wondering what I'm up to. I'd be grateful for any input onto the page. Cheers, --Plumbago 13:25, 3 October 2005 (UTC)
- Hi again. Thanks for your note on my talk page. I think you're right about the scarcity of ocean chemists, so just as well you're here! I have to admit though that, on the whole, the Wikipedia seems reasonably well serviced by scientists. In particular, some of the physics and maths articles I've looked have been really quite good (and also worth visiting to rip-off equations for formating!). To return to my prose, however, it sounds like your attention might be required back with my efforts at explaining alkalinity. I reinstated with only quite minor edits, so I might well be misleading the public again (I'm pretty sure I am re: Na+). I'll have a look at your edits to alkalinity when you get round to them and try to re-word my text where appropriate (or hack it out entirely and just point to your improved alkalinity). Cheers, --Plumbago 13:02, 4 October 2005 (UTC)
Hey Ryan, I'm a fellow water chemist... Im not sure if you have resolved your TOC question or not, but the TOC is quantified in most TOC analyzers by measuring gasous CO2 via Nondispersive Infared (NDIR) Absorbance using a light source and a beam chopper assembly to select the proper wavelength. The CO2 is formed by either combustion/persulfate reaction to remove TIC from TC. Hope this answers your question... Kris Sterichinderance 07:16, 15 May 2006 (UTC)
- Thanks for your help Kris, my comments where actually made just to point out a logical error that has been fixed from sometime now. As I don't know to much about TOC, I was hesitant to fix it myself.
I'm using this site to learn how to make a table:
- Just a short tip. You can create your own sandbox. For example, User:Username/Sandbox will create a subpage, which will link back to your userpage. Thus, User:Piyrwq/Sandbox will lead to your sandbox page. The rules for creating subpages under your user page is quite liberal. It is OK to do so to test how to make a table or such. The talk pages is not intended for testing new things. vidarlo 18:49, 29 June 2006 (UTC)
Hi there Piyrwq. I notice that you removed a statement about the free scale from the seawater section of the pH article. I'm sure there was a good reason but there wasn't an edit summary to explain. I thought that the statement was useful as it clarified a weakness of the free scale, but I'm no chemist so I'd be grateful to know what was wrong about it. Cheers, --Plumbago 22:04, 20 April 2007 (UTC)
Hi Plumbago, You've promted me to take a good review of the scales. I've put the sentence back in, having decided it was more accurate than I originally though, but the problem I have with it is that it states Kso4* is poorly estimated in seawater. I think its is relatively well know for seawater, but poorly known in low ionic strength solutions. See the second paragraph on pg 110 of Dickson 1993 (pH Buffers..., Deep Sea Research I). I don't have internet access to Dickson 1990a (Standard Potential..., Journal of Chemical Thermodynamics), where he goes into more detail so it'll take me a couple days figure this out a little more precisely. I'll let you know what I find. I think the subsection is otherwise excellent. --Piyrwq 15:21, 23 April 2007 (UTC)
- Hi Piyrwq. Thanks for all of your efforts. According to Zeebe & Wolf-Gladrow (2001), KS* is the stability constant for HSO4- rather than SO42- - could that explain the confusion about stability? Or am I showing my great chemical ignorance by even suggesting that? Regarding the 1990 Dickson reference, somewhat annoyingly my university only has the journal available from 1995 onwards. Otherwise I'd offer to get it for you.
- On the subsection's quality, I can only say that Zeebe & Wolf-Gladrow do such an excellent job in describing the pH system that it was really rather easy to distill the detail of the system down to the slender overview I added to the page. It's actually been a really useful experience for me to do it. Ordinarily I would have run a mile when asked about the free/total scales, but now I can converse quite reasonably on the subject. Although it's hardly good cocktail party repartee! ;-) Cheers, --Plumbago 16:56, 23 April 2007 (UTC)
- ok... so I've taken a look at it now. Firstly, by Kso4* I meant KS* which is stability constant that defines the equilibrium between SO4- and HSO42-, so we're on the same page there. As to why pHT is used over pHF; it appears that KS* estimations require a knowledge of single ion activity coefficients(which, according to Bates, 1975 is a "Bete Noir" of solution chemistry -I had to laugh when I read that). It seems KS* is reasonably well descibed for seawater - but not so accurately that calculating pHF leads to an answer that is equally as accurate as pHT. In light of this, left your original sentence in and never plan on looking into these detail again (Dickson 1990 is not an easy read!).
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Pre-industrial (1700s) pH
Present-day (1990s) pH
Please use them as you see fit. I'm going to gradually update my GLODAP and WOA images to take account of the WOA 2005 climatology, but thought you'd like these ones first. Best regards, --PLUMBAGO 08:19, 8 June 2009 (UTC)