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Eh And pH Geochemical Prospecting

To illustrate. the techniques involved and prov1oe a background for those not familiar with Eh and Ph, we might first very briefly define the terms, describe their measurement and indicate the method of Eh-pH diagram construction. Eh The oxidation potential of an aqueous system is determined experimentally by measuring the voltage between an inert electrode such as platinum, and a reference standard hydrogen electrode. In actual practicG, a secondary standard half cell such as a calomel electrode is used as a reference electrode in place of the primary standard hydrogen electrode. It then becomes necessary to add the Eh of the reference electrode (.241 volts for a saturated calomel electrode at 2s0c) to the measured potential E to get the Eh value. Therefcre, Eh is in effect a calculated potential obtained by adding the Eh of the reference electrode to the measured potential E as shown at the top of Figure 1. This simple calculation is unfortunately omitted or made incor• rectly in many cases, even ttough readings are reported as Eh. This results in some confusion when comparing data from different sources, especially when the method of measurement is not given. Contrary to common belief, there is as yet no instrument on the market whose scale is designed to read Eh directly, although one could easily be made.

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Pusat Sumber Daya Mineral, Batubara dan Panas Bumi - Jln. Soekarno Hatta No. 444, Bandung, Jawa Barat PMB LU 1966 - 3
PMB LU 1966 - 3
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PMB LU 1966 - 3
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Bandung : Pusat Sumber Daya Geologi.,
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15 halaman, tidak berwarna, cover biru
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English
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