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UK Window Cleaning Forum => Window Cleaning Forum => Topic started by: WavieDavie on February 23, 2007, 09:59:09 pm

Title: TDS at 180deg centigrade ??
Post by: WavieDavie on February 23, 2007, 09:59:09 pm

Trying to put together some bumph on the mineral content in water, I decided to plagiarise the small print on a bottle of still mineral water.

Amongst the "menu" of minerals and their amounts per milligram/litre there was T.D.S at 180^oC 190 As far as I know, water turns to steam at 100^oC and then evaporates. Does this "190" mean that there's no water left and that's what the ppm would have been in the water at source?

Or something else?

Anybody got a clue . . .

Title: Re: TDS at 180deg centigrade ??
Post by: simbag on February 23, 2007, 10:10:23 pm

As the minerals are listed as weights ie. milligrams, I believe that it is bascially saying what the dry weight content of the water is. So yes, no water left.

Or, I could just be talking out my hole  ::)

Title: Re: TDS at 180deg centigrade ??
Post by: WavieDavie on February 23, 2007, 10:28:25 pm

Here's the list, I've added the individual elements in case you got confused :o)

199 HCO₃ - Hydrogen Carbonate
50.8 Ca – Calcium
9.5 Mg – Magnesium
5.9 Cl – Chlorine
5.8 SO₄ – Aluminium Sulphate
5.5 Na – Sodium
<3.0 NO₃ - Nitrate
0.7 K - Potassium
T.D.S at 180^oC 190
pH - 7.7

or 280.2 mg/L
Sorry simbag,  it doesn't look like the dry weight content.

Of course, those of you who regularly read the small print on mineral water bottle labels will be able to tell me instantly which brand it is . . .  ::)

Title: Re: TDS at 180deg centigrade ??
Post by: Neil Williams on February 23, 2007, 10:44:56 pm

I've seen this on bottles of mineral water and thought WOOW.
Of course if you put water under pressure it's boiling point increases. Car engines/pressure cookers spring to mind. So perhaps they measured it that way.

Title: Re: TDS at 180deg centigrade ??
Post by: JM123 on February 24, 2007, 02:34:26 am

its a list of dissolved mineral content in 1 litre of water at standard ATP (Atmospheric Temperature and Pressure)

Title: Re: TDS at 180deg centigrade ??
Post by: WavieDavie on February 24, 2007, 04:03:39 pm

I've emailed the firm themselves. If the reply's understandable, I'll post it up.

Title: Re: TDS at 180deg centigrade ??
Post by: Ian Lancaster on February 24, 2007, 04:12:28 pm

They're probably mixing up their celcius's with their fahrenheit's ;D

Title: Re: TDS at 180deg centigrade ??
Post by: Clive McDonald on February 24, 2007, 06:15:49 pm

Agree with Ian above. As far as I know pressure cookers etc 120c max.It has something to do with somebody called Boyle ( I bet he was another b**dy Scot) but I can't remember what.

Not that its relevant but this is the came reason you can't have a hot cup of tea up a mountain- the water boils off at about 80c.

I think there is another explanation.