Companion Study Guide on Short Course on Geothermal ... - OSTI
Companion Study Guide on Short Course on Geothermal ... - OSTI
Companion Study Guide on Short Course on Geothermal ... - OSTI
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1. Calculate pHs<br />
pHs = pCa + pALK + Kc<br />
WORKSHEET 2 - RYZNAR INDEX<br />
pCa = - log (Ca) where (Ca) is the molar c<strong>on</strong>centrati<strong>on</strong> of calcium from Worksheet 1<br />
pCa = __________<br />
pALK = -log (ALK)<br />
If total Alkalinity is given as mg/l CaCO 3,<br />
then (ALK) = mg/l CaCO 3 ÷ 100089.4<br />
= __________<br />
- -2,<br />
If analysis gives HCO3 and CO3 , then use<br />
the molar c<strong>on</strong>centrati<strong>on</strong>s and pH from Worksheet 1<br />
to solve:<br />
- -2 pH-14 -pH<br />
(ALK) = (HCO3 ) + 2 (CO3 ) + 10 - 10<br />
= __________<br />
pALK = - log (ALK)<br />
= __________<br />
“Kc” is a complex term involving two equilibria c<strong>on</strong>stants and activity coefficients; all<br />
temperatures dependent terms. Its calculati<strong>on</strong> is quite complex and is bey<strong>on</strong>d the scope of this<br />
method. Fortunately, however, graphical methods for estimating “Kc” are available. Furthermore,<br />
Kc is relatively insensitive to minor errors introduced by the assumpti<strong>on</strong> required for the two<br />
graphical methods.<br />
It TDS is less than 6000 ppm, refer to Figure A-1 and determine the value for Kc.<br />
It TDS is greater than 6000 ppm, complete Worksheet 2A and use the calculated i<strong>on</strong>ic<br />
strength to derive Kc from Figure A-2.<br />
Kc = __________<br />
pHs = __________<br />
2. Calculate the Ryznar Index<br />
Ryznar Index = 2 pHs - pHa<br />
= __________ - __________<br />
= __________
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