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Frequently Asked Questions - Soil Oxidant Demand

 


FAQs

General

How many samples should be analyzed from my site?

Should duplicate the Soil Oxidant Demand analysis be conducted on samples?

Should a laboratory test of Soil Oxidant Demand be conducted in addition to this screening analysis?

How can I interpret the SOD test results?

What do the SOD test results mean?

What is the EPA or Standard test method used in the Soil Oxidant Demand test kits?

Is there a laboratory report that goes with the Soil Oxidant Demand test kits?

Does Oxidation Systems offer Soil Oxidant Demand test kits that use other oxidants like hydrogen peroxide, Fenton’s Reagent, or persulfate?

 

Sample Collection and Preservation

How much sample is required for the Soil Oxidant Demand Test?

How long can soil samples be held before conducting the Soil Oxidant Demand test?

What preservation methods are required for the Soil Oxidant Demand test?

Should site groundwater be used instead of distilled or de-ionized water for the Soil Oxidant Demand test?

How many samples should be analyzed from my site?

This question is a matter of professional judgment and depends on a number of site-specific factors. In general, the more samples that are analyzed for Soil Oxidant Demand, the more accurate and reliable the evaluation of the suitability and cost for implementing in-situ chemical oxidation. For a small to medium sized site, a good rule-of-thumb is to collect two to five samples from each geologic unit present. If varying contaminants are present in different areas of the site, several samples should be collected and analyzed from each region. Larger sites require more samples.

Should duplicate the Soil Oxidant Demand analysis be conducted on samples?

The need for duplicate analysis for a given site should be assessed relative to the planned use of the Soil Oxidant Demand test results. If the SOD tests are being conducted to determine if further evaluation of in-situ chemical oxidation is warranted (i.e. a “go / no-go” decision), then duplicate sample analysis may not be required. However, if the SOD test results are the principle method of evaluating ISCO, then duplicate sample analysis should be used to evaluate the accuracy and repeatability of the results.

 

Should a laboratory test of Soil Oxidant Demand be conducted in addition to this screening analysis?

Yes. The Soil Oxidant Demand test method developed by Oxidation Systems is intended to be a screening level analysis to evaluate the suitability of in-situ chemical oxidation for a particular site. Although the results are accurate and the test uses the same chemicals and many of the analytical procedures used in the laboratory SOD test method, it is not intended to be a substitute for the laboratory SOD method. However, the results are often identical to the laboratory method, and the SOD test kits offer rapid results with lower cost.

How can I interpret the SOD test results?

The results of the Soil Oxidant Demand test are presented in units of grams of permanganate per kilogram of soil (g/kg). This means that for every 1 kilogram of site soil, there is enough reactive material (e.g. metals, organic compounds, contaminants, etc.) to “consume” or react with 1 gram of potassium permanganate. 

What do the SOD test results mean?
The results of the Soil Oxidant Demand test are presented in units of grams of permanganate per kilogram of soil (g/kg). If the SOD test results indicate 1 g/kg and the mass of soil requiring treatment at the site is 10,000 kilograms, then the amount of potassium permanganate required to satisfy the soil oxidant demand (also known as natural oxidant demand is 10,000 grams (1 g/kg x 10,000 kg).

What is the EPA or Standard test method used in the Soil Oxidant Demand test kits?

Oxidation Systems developed the Soil Oxidant Demand test kits using a modified version of the USEPA Soil Oxidant Demand screening test method for permanganate (PSOD-1). The Oxidation Systems test method is more quantitative than the USEPA method and includes more oxidant demand ranges (1, 5, 10, and 20 grams per kilogram).

Is there a laboratory report that goes with the Soil Oxidant Demand test kits?

Yes, Oxidation Systems has developed a Soil Oxidant Demand report that can be used to summarize the analytical method and the results. It is available on the CD provided with SOD-Starter Kit, or it can be downloaded from our website.

Does Oxidation Systems offer Soil Oxidant Demand test kits that use other oxidants like hydrogen peroxide, Fenton’s Reagent, or persulfate?

Not at the moment, but we are actively developing test kits for other oxidants and expect to have them available soon. Sign up for our newsletter to be informed of new oxidant test methods and other innovative developments with Oxidation Systems.

 

Sample Collection and Preservation

How much sample is required for the Soil Oxidant Demand Test?

Each Soil Oxidant Demand test requires a minimum of 50 grams of soil. If you use site groundwater (distilled or de-ionized water can be used instead), you will need 250 milliliters (0.25 liters).  Refer to the Sample Collection and Handling Protocol for SOD Testing guidance document for additional information.

How long can soil samples be held before conducting the Soil Oxidant Demand test?

Although there is no hold time restriction for the Soil Oxidant Demand test, it is highly recommended that the SOD analysis be conducted within two weeks of collection. It is important to understand that oxidation and reduction conditions can change quickly for soil samples exposed to air and drying conditions. Therefore, samples should be analyzed as quickly as possible.  ).  Refer to the Sample Collection and Handling Protocol for SOD Testing guidance document for additional information.

What preservation methods are required for the Soil Oxidant Demand test?

For the Soil Oxidant Demand test, cooling at 4° C is the only sample preservation required during transport and storage. Refer to the Sample Collection and Handling Protocol for SOD Testing guidance document for additional information.

Should site groundwater be used instead of distilled or de-ionized water for the Soil Oxidant Demand test?

The effects of contaminants in the site groundwater usually will not significantly impact the test results because the concentrations of materials in the soil that react with permanganate are the major contributing factors. If site groundwater is not provided or available, de-ionized (DI) or distilled water can be substituted and should be noted in the report.  Refer to the Sample Collection and Handling Protocol for SOD Testing guidance document for additional information.







 

 

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