[meteorite-list] Water cutting question

[Adam Hupe]

I am more concerned with the chemicals added to and the metals contained within our "drinking" water than the pH level so long as it is somewhere near a pH level of 7.0.  If I wouldn't dream of drinking the tap water, I certainly wouldn't want to jump-start chemical reactions within meteorites by using it as a coolant.

By the way, the TDS and pH levels change throughout the day here.  The incoming tap water TDS levels are much higher in the morning than the afternoon.   I use Potassium Hydrogen Phthalate which has pH level of 4.00 and Mixed Phosphate with a pH level of 6.86 to occasionally calibrate my meters.

I do not like the idea of adding anything to the cutting coolant and have produced some very stable pieces using self-filtered and sometimes distilled water.

I have seen meteorites ooze some pretty nasty greenish brown juice like Gubura and Brenham within a few months after being cut with tap water.  Who knows what started the reaction, perhaps chlorine?


Kindest Regards,

Adam


Adam




----- Original Message -----
From: Richard Montgomery <rickmont at earthlink.net>
To: Don Merchant <dmerchan at rochester.rr.com>; Adam Hupe <raremeteorites at yahoo.com>; Adam <meteorite-list at meteoritecentral.com>
Cc: Don Merchant <dmerchan at rochester.rr.com>
Sent: Tuesday, November 27, 2012 5:31 PM
Subject: Re: [meteorite-list] Water cutting question

Adam and List...(curious me, and although I'm not cutting yet, will soon.)

The question: given any local water's TDS and variable ambient pH in all of our waters vs. using distilled water...why not use a commercial standard buffer 7.0?

-Richard M


----- Original Message ----- From: "Don Merchant" <dmerchan at rochester.rr.com>
To: "Adam Hupe" <raremeteorites at yahoo.com>; "Adam" <meteorite-list at meteoritecentral.com>
Cc: "Don Merchant" <dmerchan at rochester.rr.com>
Sent: Tuesday, November 27, 2012 9:52 AM
Subject: Re: [meteorite-list] Water cutting question


> Great Info Adam!
> Sincerely
> Don Merchant
> ----- Original Message ----- From: "Adam Hupe" <raremeteorites at yahoo.com>
> To: "Adam" <meteorite-list at meteoritecentral.com>
> Sent: Tuesday, November 27, 2012 11:53 AM
> Subject: Re: [meteorite-list] Water cutting question
> 
> 
> I remeasured the PH and TDS levels of my incoming tap water and again after being filtered.
> 
> Before filtering After Charcoal and RO Filtering
> 
> TDS: 515 PPM 31 PPM
> PH: 7.7 7.1
> 
> 
> It looks like 7 stage RO filtering made the water move towards PH neutral from being on the basic side. A reading of 7 would be considered perfect neutral so I am happy with a PH reading of 7.1. I would rather have it lean towards basic than acidic which is the case here. On the other hand, the TDS level of the incoming tap water exceeds EPA standards! I wouldn't dare drink the tap water here. Might end up with a case of kidney stones!
> 
> I don't think meteorites would be happy with the tap water here. I will do chemical testing in a few weeks. I hope there is no chloramine in our system as is the case in California.
> 
> Kind Regards,
> 
> Adam
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