L2000® Two-Step Soil Reagents

L2000 Two-Step Soil Extraction Recommended for Hard to Extract Wet Clays

Soils, such as wet clays, pose an extraction problem with most extraction solvents on the market today. If the extraction solvent cannot solvate the soil and remove the contaminant efficiently, an underestimation of the contaminant will occur. Dexsil has developed a "Two-Step Extraction Method" that allows difficult soils to be solvated efficiently for accurate and reliable results. An on-site study using the two-step method to extract PCB from lacustrine clay demonstrated that when compared to a soxhlet extraction method, the 2-step method had an extraction efficiency of >78%. 

Collected soil samples are extracted and reacted with a sodium reagent to strip the covalently bonded chlorine from the analyte(s) converting it to inorganic chloride.  The resulting chloride is then detected and quantified using a chloride ion specific electrode.  The L2000DXT then mathematically converts the chloride reading to the equivalent concentration  of the target analyte based on the percent chlorine associated with the analyte.  Note:  Inorganic chloride, e.g. road salt, will not interfere with the test.  Conversion programs are available for all major Aroclors and most common chlorinated solvents and pesticides.  Custom conversion programs can be built for less common analyte(s) not included on the L2000DXT menu, instructions are included in the user manual.

The usable result range is (MDL) 3 ppm - 2000 ppm.  Results for the L2000DXT are displayed on a 7" LCD touch screen and are stored in the internal memory.  Results may also be saved to an external flash drive for easy uploading to an Excel program to make later recall and reporting quick and easy.