Environmental BioTechnologies, Inc.

Does soil pH have an effect on the MET value?

EBT has analyzed over 1,900 soil samples for both pH and MET value. The soils were collected in the southern portions of Alberta and Saskatchewan, Canada during the months of May through September, 1996. The following figure shows the bell shape distribution pattern of the soil pH values. The average pH value was in the range of 7.5 to 8.0. There were less samples collected at the extreme basic and acidic pH ranges so these may not accurately represent soils in these pH ranges.

As shown in the following figure, there may be a trend suggesting that the MET value increases as the soils become more acidic (in the 5.5-6.0 pH range). Analysis of this data in scatter plots (not shown), indicates that each pH range can have a full range of MET values and that there is a general bell shape distribution for each grouping. Some surface geochemical exploration processes expect that long term migration of hydrocarbons to the surface will cause a pH drop to occur. When we have contoured graphed our pH data for a survey area and examined it in correlation to our MET contour data, we are of the opinion that pH is not playing a strong role in governing the MET response. We believe that the MET process is not directly influenced by pH. The MET technology can be used in soils ranging from pH 5.0 to 9.5 without the need to modify the MET data interpretation process.

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Environmental BioTechnologies, Inc.
255C S. Guild Ave.
Lodi, CA 95240
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