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geothermal resource potential of the safford-san simon basin, arizona

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o<br />

Therefore, <strong>the</strong> ionization constant at any temperature ( K)<br />

is:<br />

Equation 10<br />

K.r=<br />

-720.5 -7.30<br />

T<br />

o<br />

Thus, a complete pH silica correction for any insitu temperature ( K)<br />

may<br />

be calculated using milligrams per liter <strong>of</strong> analyzed silica as follows:<br />

Equation 11<br />

1.0416667X10- S<br />

where:<br />

x = t-7~0. 5J-7.3 + pH + log ~Ana1yzed silica) (1.0416667X10-52J<br />

The silica correction value (C Si02<br />

) is subtracted from analyzed silica before<br />

geo<strong>the</strong>rmometer calculations are performed.<br />

A silica correction for pH may<br />

be necessary only for pH exceeding 7.8 and is generally not important until<br />

pH exceeds 8.5.<br />

118

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