Ecoprobe 5

Transcript Ecoprobe 5 - RS Dynamics

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Portable IR/PID gas analyzer A new dimension in detection of contaminant indicators

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Soil Contamination Survey Gas from the pore space in soil and rock formations is known as soil vapour. The composition of this phase, in particular the presence of organic compounds, reveals vital information about pollution of the subsurface contaminant. Organic compounds constitute a group of contaminants which impact severely on groundwater resources.

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Soil Contamination Survey The presence and distribution of such pollutants can be detected by a newly established technique known as Soil Vapour Survey (SVS) which is based on analysis of the soil gas or vapour.

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Soil Contamination Survey The following types of contaminants are addressed: 1.

Liquid organic materials including hydrocarbons (mainly petroleum products) and chlorinated hydrocarbons (industrial solvents, metal-cutting oils etc.) 2.

Organic vapours from landfills and from gas leaks

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Soil Contamination Survey Factors affecting in situ SV measurements: 1. Presence of Methane of nature origin: Methane occurs in different concentration everywhere in the soil environment, which confuses all total based in-situ measurements.

2. Type of contaminant: technique).

for the SVS to be applied successfully, the contaminant of interest must yield sufficient vapour phase. (Some compounds like transformer oils, PCB and certain phenols create very low vapour phase and require special sampling

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Soil Contamination Survey 3. Zoning : properties differences in several physical of the compounds present in a complex pressure, solubility in subsurface, resistance may contribute towards contaminant (vapour water, mobility in the heterogeneous character of a pollution plume. 4. Surface contamination: to degradation etc.) the a pollutant occurring in the surface layer will seriously affect the distribution and concentration patterns of an underlying, deep source of contamination.

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Soil Contamination Survey 5. Age of a contaminant: All petroleum products experience some degree of natural biodegradation process in the subsurface environment. Lighter HC are more readily degraded than the heavier compounds. After a certain period of time the spectral composition of contaminants will dramatically change; moreover, some contaminants may become morphologized, that is: composed of non-toxic aromatic compounds which are out of the basic hydrocarbon spectrum.

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Soil Contamination Survey 6. Soil temperature: vapour density and vapour diffusion will increase with increasing temperature.

7. Soil moisture: the presence of moisture will reduce the effective porosity which will negatively affect the migration and the volume of SV available for investigation. 8. Soil permeability: may dramatically influence the measured value of concentration of the free SV phase.

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Soil Contamination Survey Previous SVS methods Previously used time-integrated SVS methods applied special absorbents into which the analyzed soil vapour was absorbed during a relatively long time-interval.

These methods did not meet natural conditions and yielded incorrect quantitative results.

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Soil Contamination Survey of Mix the identical quantity liquid contaminant . . . . . . . . . . . . . . . . . . . . . Poorly permeable soil clay Permeable soil sand Measurement of SV concentration in both samples shows the difference of up to 2 or 3 decimal orders.

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Soil Contamination Survey RS DYNAMICS mentioned developed a special instrumentation - provides a solution for most of the above complicated conditions and offers the true in-situ method for a reliable soil contamination survey. Ecoprobe 5 -- which Ecoprobe 5 eliminates sampling and sample transport problems to the lab, in this way offering fast, cost- effective and reliable location of contaminant sources and trajectories of the contaminant spread.

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Soil Contamination Survey The air is sucked into the probe and continuously analyzed in the instrument

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Soil Contamination Survey Ecoprobe 5 shows the course of measurement overview on the screen Graphs of concentrations versus time

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Soil Contamination Survey The identical quantity of contaminant is mixed into the samples clay d san

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IR/PID correlation graphs obtained from Ecoprobe 5

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ECOPROBE 5 Portable and compact highly sensitive gas analyzer providing cost-effective and reliable in-situ results

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ECOPROBE 5

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ECOPROBE 5 Comprises two autonomous analyzers in one case D PI + IR Combination of PID and four channel IR analyzers provides solution for a variety of contamination survey tasks.

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Applications

Ecoprobe 5 provides a complete system and methodology for contaminant detection

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Basic application

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Detection & monitoring of hydrocarbons and other organic contamination of soil & water table from fuel spills Soil vapour survey was made by CSIR/ Petrocon (Council for Scientific and Industrial Research), South Africa

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Basic application

herds to the creep of the earth’s crust.

GPS consists of 24 satellites in predictable orbits around the earth. The system provides 24-hour positioning information.

Ecoprobe 5 is the first world-wide geophysical instrument to provide GPS positioning !!

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GPS Data Logging

GPS satellite orbital information is referenced to WGS 84. WGS 84 is an earth fixed global reference frame using latitude and longitude coordinate system to locate points on the Earth’s surface.

The GPS system in Ecoprobe 5 can be used if a specific software is activated and if a special RS DYNAMICS GPS receiver is available.

Depending upon accuracy requirements, users may select from GPS systems with

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Meter precision

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Decimeter precision Centimeter precision

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Data Logging

Standard data logging system 5 15,

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Data are saved in an orderly manner 25 35,

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PID Analyzer

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Measures total concentration of volatile organic compounds and other toxic gases including chlorinated hydrocarbons 3000 ppm Result value measured by PID

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Methan VOC e Spectrum PID analyzer selectively excludes Methane from the total sum

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PID Analyzer Two ranges: D STANDAR HISENS detection limit 0.1 ppm upper limit 4000 ppm (output also in mg/ m

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) detection limit 0.1 ppb (0.0001 ppm) upper limit 100 ppm (output also in µg/m

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) HISENS mode is extremely sensitive (intended for precise measurement ). It is not recommended for the typical soil vapour survey since factors like moisture, presence of methane, under-pressure may influence the results.

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PID Analyzer

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Spectral characteristic of Ecoprobe 5 PID unit is equal to the laboratory gas chromatograph unit (if the same lamp is used) which brings very close results between Ecoprobe 5 outputs and laboratory analysis results for given samples.

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Interchangeable ion lamps (10.2 eV standard)

RELATIVE ANALYSIS Fast and cost effective identification of relative concentration cloud, contaminant sources, path and the range of contaminated area. Table of measured compounds by PID offers mixtures of most common contaminants (Diesel Fuel, Gasoline, Jet Fuel). Select the compound characterizing the contaminant to get most reliable data.

QUANTITATIVE ANALYSIS Ecoprobe 5 is calibrated for Isobuthylene (Isobuthylene represents the most suitable gas which is also used in laboratory gas chromatographs). Responses to other compounds are different. The instrument is, however, automaticaly calibrated for about 200 compounds. In spite of this fact Ecoprobe 5 is not a spectral sensitive analyzer.

QUANTITATIVE ANALYSIS

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In an ideal case when composition of contaminant is known and created by compound, one select the compound from the list that is chemically equal or close to the contaminant . You will get quantitative concentration of vapour phase.

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Commonly the contaminant is a mixture of compounds.

complicated However, it is possible to get approximately quantitative, fast and reliable results for a typical soil vapour survey

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Application of PID Analyzer

1. For measuring small values of contaminant concentration 2. For measuring wider spectrum of contaminant 3. For quantitative measurement

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IR Analyzer Provides selective detection of METHANE, Petroleum Hydrocarbons and Carbon Dioxide.

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4 independent channels ( ppm or mg/m

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output ) :

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Methane; 0 -500 000 ppm, detection limit 20 ppm

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Petroleum Hydrocarbons ppm, d.l. 20 ppm including Methane ; 0 - 500 000

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Carbon Dioxide; 0 - 500 000 ppm, d.l. 20 ppm

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Reference channel

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IR Analyzer If hydrocarbons are present in the contaminant, consequent continuity between PID and IR outputs can be observed.

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Application of IR Analyzer

Relative and fast in situ monitoring of contaminant

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the computer

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Communication software for transferring data to a computer and for basic graphic evaluating of measured data. Data format compatible with Surfer, Grapher, Geosoft, etc.

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Data processing using Communication Software

Graphic results using Ecoprobe Plus

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communication software 1. Values from all channels for a particular line

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communication software

2. All lines for one parameter

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Graphic results using Ecoprobe Plus communication software

3. Course of measurement on one site

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- Grapher, Surfer etc.

Contour map of subsurface contaminant location

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