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Nonequilibrium sorption of nonionic organic chemicals in soils experiments and modeling /Altfelder, Sven. Unknown Date (has links) (PDF)
Techn. University, Diss., 2000--Braunschweig.
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Elektrochemické stanovení chlortoluronu na uhlíkové pastové elektrodě / Electrochemical determination of chlortoluron using carbon paste electrodeHoušková, Lucie January 2012 (has links)
Chlortoluron is a herbicide from the group of substituted ureas and it is used for weed control in production of cereals and poppy. Substituted ureas are widely used but these substances are known for their high mobility in soil, persistence and contamination of underground water. Therefore, the development of analytical methods suitable for residual concentrations determination is necessary. This thesis deals with the determination of chlortoluron using carbon paste electrode (CPE) by the methods of differential pulse voltammetry and high-performance liquid chromatography with electrochemical (HPLC-ED) and spectrophotometric (HPLC-UV) detection. The aim of the work was to find optimal conditions suitable for chlortoluron determination. Further, the possibility of using miniaturized carbon paste electrode (mCPE) and usability of tested methods for determination of chlortoluron in model samples of river water and soil were studied. Concentration dependences in deionized water were measured by the method of DPV in the Britton-Robinson (BR) buffer (pH = 3) and methanol (10 %, v/v). The limit of detection was 3,7∙10-7 mol∙dm-3 in the case of CPE and 8,7∙10-8 mol∙dm-3 in the case of mCPE. Also, concentration dependences were measured using HPLC with mobile phase containing BR buffer (pH = 4) and...
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