Quantitative determination of chelators and their degradation products in mixed hazardous wastes from Tank 241-SY-101 using derivatization GC/MS |
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Authors: | K E Grant G M Mong R B Lucke J A Campbell |
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Institution: | (1) Advanced Organic Analytical Methods Development Group, Pacific Northwest National Laboratory, Box 999, 99352 Richland, WA, USA;(2) Present address: Columbia Basin College, Pasco, WA |
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Abstract: | Considerable attention has been focused on chelators such as ethylenediaminetetraacetic acid (EDTA) and N-(2-hydroxyethyl)ethylenediaminetriacetic acid (HEDTA), which form water-soluble complexes with most heavy metals. Most radionuclides are included in this class of constituents. As a result, chelator complexes have become very important environmentally because of their tendency to enhance the mobility of heavy metals through the soil and potentially contaminate groundwater. In addition, there is a correlation between chelator concentration and crust formation/gas release. The chelators are a class of compounds whose low volatility and high polarity preclude analysis by gas chromatography/mass spectrometry (GC/MS) without prior derivatization. Waste samples from a double-shell storage tank at Hanford were derivatized with BF3/methanol and analyzed using GC/MS. Results indicate the presence of EDTA, HEDTA, nitrilotriacetic (NTA), and citric acid. Nitrosoiminodiacetic acid was identified and determined to be an artifact of the derivatization procedure; it is assumed to arise from nitrosation of iminodiacetic acid in the waste sample. |
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